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Topic: 3.73 vs 3.90 vs 4.10
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rayski25
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Member # 11363
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posted
I'm torn between witch gears to pick up for my 89lx, I have light mods( bbk cold air, full exaust, ac/heater delete kit, bbk under drive pullies) an am not sure witch route to go. I drive my car everyday to an from work about 50miles but also have another car to drive to an from work so not totally concerned abt gas. An after I install gears how do I calibrate the speedo?
-------------------- 66 mustang v6 converted to 351w(sold) 89 mustang lx(sold) 88 mustang gt(current DD)
Posts: 319 | From: modesto | Registered: Oct 2011
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Jaejae5.0
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Member # 7958
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posted
Personally I like 3.73 ..and a new speedo gear is 10$ on 50resto.com
-------------------- 1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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triple b
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Member # 8763
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posted
well since u DD that id do 3.55 50 miles a day make a shittty mpg even worse if u go more gear than that
-------------------- 1988 4cyl conv 306 HCI "sasha" 2004 tahoe Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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Sydewayz_Stan
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Member # 10217
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posted
quote: Originally posted by triple b: well since u DD that id do 3.55 50 miles a day make a shittty mpg even worse if u go more gear than that
3.55-3.73 is only a difference of 100 rpm or so on the freeway.
-------------------- -90 Vert-SOLD -91 Notch-SOLD -2000 Explorer 5.0-SOLD -72 Maverick-SOLD -2004 GT, vortech V2 si, 10 psi- -2002 F150 supercrew-
Posts: 3432 | From: 707 vallejo/richmond 510 | Registered: Aug 2010
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need-a-cage
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Member # 5415
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posted
What do you want to do with the car? I would go 3.73 or 3.55. If you are going to drag race, then 3.73's. When I was stock and on street tires, my 3.55's gave me the same ET as my 3.08's. First spun more and I had to hit 4th too close the finish line. With the 3.08's I could hold 3rd. The 3.55's feel great on the street though. I would not want a lower 1st gear on the street, but 3.73's would work better at the track with that power level. If you are under 110mph in the 1/4, then 3.90's would be ideal for the track, but 1st would spin like crazy on the street and be pretty useless. If you have a world class T-5 or TKO 600 with the tall 1st gear, then the 3.90's would be okay. If you are sticking with the stock ratio T-5 or TKO 500 or Tremec 3550, and drive a lot on the street, then I would go with 3.73's. That way you can use more of 4th at the track than I did with the 3.55's and that power level.
-------------------- 93 LX Hatch, Dart Big Bore 347, Edelbrock 6037's, Cobra intake, Tremec, S-trim, 60# injectors, Tweecer RT 10.84 @ 128.5mph
Posts: 606 | From: Santa Rosa | Registered: Mar 2005
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89bluenotch
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Member # 7454
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posted
I like my 3.73's I daily with them..... Who gets into this game and worries about MPG??
-------------------- -Gunnar 89 coupe 54 f100 R.I.P. SILVERLX
Posts: 1857 | From: HEALDSBURG | Registered: Feb 2007
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86redGT
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Member # 6961
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posted
I had 355's and 410's on my 86,
The 355's were definitely much better to drive around town and on the freeway on. 410's were obviously better for the track but for street driving it was a lot of shifting and the freeway mileage suffered. Personally I think it really is personal preference.
-------------------- 2003 Mustang Cobra 2016 Fiesta ST
Posts: 314 | From: concord | Registered: Aug 2006
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rayski25
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Member # 11363
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posted
Ok thanks for all the input guys, right now I'm leaking towards 3.08 chp gears or 3.73s ither way I'll be happy to see the change! Thanks again!
-------------------- 66 mustang v6 converted to 351w(sold) 89 mustang lx(sold) 88 mustang gt(current DD)
Posts: 319 | From: modesto | Registered: Oct 2011
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Sikwidit-blumaxx88
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Member # 11046
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posted
Go 373 bro ull be happy 373 FtW!!!
-------------------- SikwidiT cc 1988 5.0
Posts: 507 | From: East bay | Registered: Jun 2011
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91blackonblack
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Member # 11591
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posted
3.55's for the win.i love them on street an freeway.i had 3.73's a hell of a ruff feeling on the freeway.but 3.55"s ftw u cannot go wrong with them because there street an freeway an racing.all in one [ August 02, 2012, 01:41 AM: Message edited by: 91blackonblack ]
-------------------- 91blackonblack is banned from this website for good. Vallejo ghetto drama does not belong on CAFords! Y'all need to find a different website. PLEASE! GTFO and take your ghetto shit with you.
ps- ENGLISH DOES MATTER. How foolish of CAFords, we wrote this on our registration page http://oi49.tinypic.com/2akjm7k.jpg but now realize it's useless because the intended audience CAN'T READ, TYPE OR UNDERSTAND ENGLISH!
His response:
"I just want to say i need some very important info.an the onl way was through a friend to help me find that info.but you guys are some fucking bitches that hide behind ur fucking computer all damn day.you fucking bastards racist piece of shyt.exspecally with that nazi symbol you guys think is koo.fuck you i hope i fuck ur sisters or wife.punk bitches.you guys are fucking haters.an i hope ur fucking website crashes to.god has the last word.an u guys let that piece of shyt 396 get away with murder.an letting everybody get banned because of his shyt talking.i hope he gets his to from somebody.one day he going to say the wrong thing to somebody.fuck u bitches.you mark ass.bye punks"
At least he's consistent with his views!
-----------------------------
91 ssp 306,h.c.i. +v2 blower,suspension Duncan motorsFTMFTW/F.O.D. FTMFTW Mr.Quandoe" swang shyt click"
Posts: 1608 | From: the blower yo bitch | Registered: Jan 2012
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SwEeT03Gt
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Member # 10283
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posted
4.10's for a N/A mustang dont fear the gear!
Posts: 4484 | From: -NicKlE n DiMe- | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
quote: Originally posted by SwEeT 03 Gt: 4.10's for a N/A mustang dont fear the gear!
+1
-------------------- Built 2v Stroked, Cammed and Blown Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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95gtdrop
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Member # 7478
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posted
410 on a 5.0 N/A is amazing!!! do it
-------------------- 1997 SVT cobra SOLD;( 2004 SVT Cobra Vert
Posts: 1221 | From: sacramento | Registered: Mar 2007
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Wildfire532FB
CAFords OG
Member # 1482
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posted
How much RPM increase will i get going from 3.54 to 3.73?
-------------------- ./_ _ _ ___ __\ (]]]_ _ o _ _[[[) |\_o_ __ __o_/| |__|..........|__| 68 Fastback 84 CJ7 94 HMMWV 95 GT 03 F350 17 Fusion Hybrid
Posts: 17578 | From: 530 | Registered: Jun 2002
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KCmustangboy
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Member # 1927
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posted
3.73 on a 5.0 if you daily drive it that much. It won't be that bad on the freeway and you will still feel it at the track. 4.10s if you don't care and want to feel some pull. I personally would never go less then 4.10s [ August 07, 2012, 08:33 PM: Message edited by: KCmustangboy ]
-------------------- 03 Cobra... Factory long block, with Whipple and AED tune... 812rwhp 10.0s @ 140... almost there!
WWW.AEDHP.COM
Posts: 1691 | From: San Jose, CA | Registered: Oct 2002
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Blind
2.3L CAFords OG
Member # 3052
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posted
quote: Originally posted by Wildfire532FB: How much RPM increase will i get going from 3.54 to 3.73?
depends on tire size and what gear ratio in the trans, but you could bet on 200-300rpm
-------------------- 89 LX Notchback ex 4cyl, 14psi 02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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sic70stang
CAFords OG
Member # 4347
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posted
Spent about 15 minutes looking for my old gear chart from 2010 and here she goes.
3.27 good for noobs that are not interested in performance. Or have turbo.
3.55 good for girls mustangs. Also good for skiddish men that lack testosterone. If u have a stock 50 engine maybe these are good for you.*
* opinion on these gears will soon change to " man I wish I went with 3.73 instead.
3.73 great if u make power under 5400 rpm. All around gear great for someone who thinks that 4.10 is the monster under the bed.
4.10+ now this means business. If u are not afraid to go balls to the wall step right up. Freeway runs will not matter if u leave the next looser by 3 cars on the third honk.
-------------------- The anti-crew 1987 rolling safety violation.
Posts: 6940 | From: California | Registered: Jul 2005
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Mach916
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Member # 8264
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posted
less is more... people in this thread make me laugh.. 327 big balls...355 bigger balls... 373 even bigger hahaha
Posts: 1247 | From: Sacramento | Registered: Mar 2008
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nitrous_bob
CAFords OG
Member # 77
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posted
in my opinion go 4.10 or just leave it stock, doing less gear loses you performance and NOTHING else
MPG is not even affected, its how you drive it
every one of my 5.0's got 21-24 MPG if i drove it cool whether they had 2.73 or 4.10
each bump in gearset will run you about 250 rpms higher then the one below it in any given gear. thats a rough number, but your looking at 1000 rpms higher total in any given gear if you swap from 2.73 to 4.10
here are some facts, to dispell some of the retarded rumors you may have heard...mostly from people who used 3.55 and want you to waste your money too cuz they feel bad about themselves
1) you will NOT have to shift into 5th in a 1/4 mile with 4.10's
2) you will NOT tach 4k doing 60 you tach about 3000 doing 70-75
3) you will NOT get 10 mpg, well you will,,,,cuz you'll be in it all the time. but if you drive cool you'll do 21 mpg
4) a stock 3.73 car CANNOT lift a tire on slicks, but a stock 4.10 car WILL lift about 6" (that alone should sway you)
so although the gearing is close...4.10 is optimal for a NA car looking to squeeze every tenth it can
its not worth bumping a single gearset, so make sure you do it right the first time
correcting the speedo is either easy , complicated, or impossible
your '89 if it is a 5 speed is easy, if its an AOD...its , for practical measures...impossible
correcting the speedo "PROPERLY" means using the correct driven gear with your current drive gear
an AOD is an 8 tooth drive gear and can only be corrected to 3.55's with a 23t driven gear which is incorrect as that white 23t gear is from a jeep, and has the wrong pitch for either T5 or AOD...but its worse for AOD
so technically an AOD can only be corrected to 3.27s with the purple 21t
T5's are 7t for the older ones and 8t for the newer
an '89 is a 7t
the biggest diff with a AOD V T5 is that the drive gear is a ring gear just c-clipped on the output shaft on a T5 and requires disassembly to do it...but an AOD has the drive gear machined into the output shaft. i cant even tell you if an output shaft was ever made that is a 6t or 7t
anyways..... the best thing you can do if your T5 is ever apart is put a black 6t drive gear, then you can correct to 4.10's with a black 20t
but you can...correct an '89 trans with a non ford 23t and it will work. if you drive alot of miles...you will chew it up tho, so be prepared for that. or just use the red 21t and be about 7% in error but not chew it up
thats my 2 cents, im on my 6th stang and i will NEVER use anything but 4.10
*** and before someone says "i used 3.55 and it was way better than stock" ***
well of course it was.....and if a starving ethiopian found a rotten big mac he'd eat it and love it, but it doesnt make it delicious. it just makes it "better than starving"
-------------------- 5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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nitrous_bob
CAFords OG
Member # 77
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posted
quote: Originally posted by rayski25: 3.08 chp gears
um...what ?
hey i can sell you one of those "ultra rare" world class t5's if you want.... waaaaay better than the t5 you have already
ok sorry...how did you go from
"i wanna bump up to something good"
to...
" i wanna swap out for the same gears i already have "
check your door tag...do you even know what gears are in it now?
"ax" code
m=2.73 z=3.08 e=3.27
-------------------- 5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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nitrous_bob
CAFords OG
Member # 77
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posted
quote: Originally posted by need-a-cage: If you have a world class T-5
AHHHHHHH !!! i get to triple post, but I HAVE TO !!!!!!
ok so i was joking about the whole "i'll sell you a world class thing"...... cuz i had to assume that 20 years after they didnt even sell this trans anymore people knew the scoop, and i was trying to make a point about the so called "CHP 3.08 gears"
but i'll give you a hint.... 1) he said '89 mustang 2) he said 5.0
so yeah....pretty much i can deduce that he has a world class T5
im not busting your ballz.....dont get me wrong
i just thought those days were long gone, but you gave me a laugh
-------------------- 5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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triple b
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Member # 8763
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posted
dam im sold who wants to buy my 3.55 lol i dont want to be starving?!?
-------------------- 1988 4cyl conv 306 HCI "sasha" 2004 tahoe Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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rayski25
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Member # 11363
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posted
Holy mother of gawd! That was the best read of my life!!! Ima go with the 4:10s dude is one hell of a sales man! Thanks everyone for the input I appreciate the help
-------------------- 66 mustang v6 converted to 351w(sold) 89 mustang lx(sold) 88 mustang gt(current DD)
Posts: 319 | From: modesto | Registered: Oct 2011
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rollin5ive0
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Member # 8592
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posted
quote: Originally posted by nitrous_bob: in my opinion go 4.10 or just leave it stock, doing less gear loses you performance and NOTHING else
MPG is not even affected, its how you drive it
every one of my 5.0's got 21-24 MPG if i drove it cool whether they had 2.73 or 4.10
each bump in gearset will run you about 250 rpms higher then the one below it in any given gear. thats a rough number, but your looking at 1000 rpms higher total in any given gear if you swap from 2.73 to 4.10
here are some facts, to dispell some of the retarded rumors you may have heard...mostly from people who used 3.55 and want you to waste your money too cuz they feel bad about themselves
1) you will NOT have to shift into 5th in a 1/4 mile with 4.10's
2) you will NOT tach 4k doing 60 you tach about 3000 doing 70-75
3) you will NOT get 10 mpg, well you will,,,,cuz you'll be in it all the time. but if you drive cool you'll do 21 mpg
4) a stock 3.73 car CANNOT lift a tire on slicks, but a stock 4.10 car WILL lift about 6" (that alone should sway you)
so although the gearing is close...4.10 is optimal for a NA car looking to squeeze every tenth it can
its not worth bumping a single gearset, so make sure you do it right the first time
correcting the speedo is either easy , complicated, or impossible
your '89 if it is a 5 speed is easy, if its an AOD...its , for practical measures...impossible
correcting the speedo "PROPERLY" means using the correct driven gear with your current drive gear
an AOD is an 8 tooth drive gear and can only be corrected to 3.55's with a 23t driven gear which is incorrect as that white 23t gear is from a jeep, and has the wrong pitch for either T5 or AOD...but its worse for AOD
so technically an AOD can only be corrected to 3.27s with the purple 21t
T5's are 7t for the older ones and 8t for the newer
an '89 is a 7t
the biggest diff with a AOD V T5 is that the drive gear is a ring gear just c-clipped on the output shaft on a T5 and requires disassembly to do it...but an AOD has the drive gear machined into the output shaft. i cant even tell you if an output shaft was ever made that is a 6t or 7t
anyways..... the best thing you can do if your T5 is ever apart is put a black 6t drive gear, then you can correct to 4.10's with a black 20t
but you can...correct an '89 trans with a non ford 23t and it will work. if you drive alot of miles...you will chew it up tho, so be prepared for that. or just use the red 21t and be about 7% in error but not chew it up
thats my 2 cents, im on my 6th stang and i will NEVER use anything but 4.10
*** and before someone says "i used 3.55 and it was way better than stock" ***
well of course it was.....and if a starving ethiopian found a rotten big mac he'd eat it and love it, but it doesnt make it delicious. it just makes it "better than starving"
quote: Originally posted by nitrous_bob: quote: Originally posted by rayski25: 3.08 chp gears
um...what ?
hey i can sell you one of those "ultra rare" world class t5's if you want.... waaaaay better than the t5 you have already
ok sorry...how did you go from
"i wanna bump up to something good"
to...
" i wanna swap out for the same gears i already have "
check your door tag...do you even know what gears are in it now?
"ax" code
m=2.73 z=3.08 e=3.27
quote: Originally posted by nitrous_bob: quote: Originally posted by need-a-cage: If you have a world class T-5
AHHHHHHH !!! i get to triple post, but I HAVE TO !!!!!!
ok so i was joking about the whole "i'll sell you a world class thing"...... cuz i had to assume that 20 years after they didnt even sell this trans anymore people knew the scoop, and i was trying to make a point about the so called "CHP 3.08 gears"
but i'll give you a hint.... 1) he said '89 mustang 2) he said 5.0
so yeah....pretty much i can deduce that he has a world class T5
im not busting your ballz.....dont get me wrong
i just thought those days were long gone, but you gave me a laugh
shit Im speechless, almost that was the excellent, lets see, you busted out the people who were just writing somethin they heard from someone who told someone else that told them, gave real fact, and very precise info, , and the little starving metaphor was the nail in the coffin, had me dyin! right then good show id like tickets to the next
-------------------- 875.0gt 90dtlx5.0 93blkvenumos5.0COBRA#3377 96redthundr4.6l4vCOBRA 964.6l2vGT 895.0lGT 93cleancorlgreen5.0GT 93meancoralgreen5.0GT
Posts: 1830 | From: 707 vacaville ca | Registered: Aug 2008
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