4.30 gears Q's - Northern California Ford Owners

This is topic 4.30 gears Q's in forum Tech Talk at Northern California Ford Owners .

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Posted by norcalstangman (Member # 8387) on :

I have a buddy that has 4.30s in his stang nd says he's not supposed to go over 55 mph on freeway constant. is this true? don't make any sence to me [Big Grin]

Posted by mastercudaz (Member # 7486) on :

well its probably because the rpms are pretty high. you can try calculating it here:
http://www.csgnetwork.com/multirpmcalc.html

given the gears if its a 5 speed its probably over 3 grand in 5th, if its an automatic... well try calculating it [Eek!]

Posted by SmokinLX (Member # 1684) on :

Where did He get His info?

Posted by norcalstangman (Member # 8387) on :

thank u for da info mastercudaz.

smokinLX I don't kno where my boy got that info. I think he was told that. but that's y he stays off the freeway

Posted by Stangs R Us (Member # 4495) on :

wow never heard of that i drove my 96 cobra with 4.30s all over never had a problem on the freeway

Posted by need-a-cage (Member # 5415) on :

What he probably heard was the shop telling him that during breakin he should not go over 55 for a long time without stopping and letting the rearend cool down.

Otherwise that is complete BS and I can't believe that anyone actually believed that! If that was the case, do you really think anyone would use those gears!

Posted by 03SVTPower (Member # 518) on :

maybe some one told him not to go over 55 so he can get better gas mileage on the hwy. As for the break in myth, dont know why people say there is a break in period CUZ THERE AINT ONE!!!

Posted by norcalstangman (Member # 8387) on :

I really don't know y he even got 4.30s anyways he spins all day lol. it picks up for sure tho.
really? REAREND SPECIALTIES in santa clara told him he had to break in the gears for 500 miles before abusing them.

Posted by warhorse58gt (Member # 7702) on :

quote:
Originally posted by 03SVTPower:
maybe some one told him not to go over 55 so he can get better gas mileage on the hwy. As for the break in myth, dont know why people say there is a break in period CUZ THERE AINT ONE!!!

your wrong. [patriot]

there is a break in. richmond says there is a 400-500 mile break in. they want you to drive it like 50 miles then let it rest. do this a couple of times then drive it nice for another 300-400 miles. also they say baking the gears at 400 degree's will help the break in. but what does richmond gears know. [Roll Eyes]

Posted by 03SVTPower (Member # 518) on :

quote:
Originally posted by warhorse58gt:

quote:
Originally posted by 03SVTPower:
maybe some one told him not to go over 55 so he can get better gas mileage on the hwy. As for the break in myth, dont know why people say there is a break in period CUZ THERE AINT ONE!!!
your wrong. there is a break in. richmond says there is a 400-500 mile break in. they want you to drive it like 50 miles then let it rest. do this a couple of times then drive it nice for another 300-400 miles. also they say baking the gears at 400 degree's will help the break in. but what does richmond gears know.

All I know is when i had 373's put in, in my 98, the shop who put them in said if the shop puts them in right there shouldnt be any worry about a "break in" period. Left the shop hittin 2nd gear breakin loose. But what do i know, no break in warning coming with the install kit with the FMS gear set, maybe cuz richmond gears whine even after a so called break in period....g'night [Roll Eyes]

Posted by whitelx91 (Member # 8317) on :

ITS CALLED RUNNING NEW PARTS THROUGH HEAT CYCLES AS EVERYTHING SETTLES. WHEN NEW PARTS ARE INSTALLED THEY HAVNT SETTLED YET DO TO HEAT CYCLES ONCE THEYVE BEEN THROUGH A FEW CYCLES THING START TO SETTLE DOWN WHICH MEANS PARTS DO MOVE AROUND A CUNT HAIR SO IF YOU ABUSE THEM FROM THE GET GO YOU TAKE A RISK OF DAMAGING THEM OR PREMATURE FAILURE. DO YOUR HOMEWORK NEXT TIME AND DONT OFF THE FIRST THING SOMEONE TELLS YOU. THERE IS A BREAK IN PERIOD JUST LIKE WITH MOTORS AND TRANNYS. GOODNIGHT!

Posted by gq916 (Member # 8540) on :

I have 430s and I drive 80mph at 3100rpm all the time.. Maybe he said 55mph for the break in period.. My installer told me to drive around that speed during break in

Posted by DSG04GT (Member # 5653) on :

had 4.10's installed on my 97GT when i had it.

BREAK IN PERIOD!? pshhh..after leaving the shop..came around the corner..punched it..broke em loose in 2nd, and in 3rd..

break in period my ass [Razz]

Posted by jaejae (Member # 7958) on :

quote:
Originally posted by DSG04GT:
had 4.10's installed on my 97GT when i had it.

BREAK IN PERIOD!? pshhh..after leaving the shop..came around the corner..punched it..broke em loose in 2nd, and in 3rd..

break in period my ass

i think a break in period is only necessary when the owner cares about his car [Big Grin]

Posted by norcalstangman (Member # 8387) on :

ok my buddy told me that wit 4.30s his odometer is runnin faster then its supposed to. can that happen? he's gettin
un-nesesary millage

Posted by Blind (Member # 3052) on :

quote:
Originally posted by norcalstangman:
ok my buddy told me that wit 4.30s his odometer is runnin faster then its supposed to. can that happen? he's gettin
un-nesesary millage

because your buddy was born a few crayons short of a full box.

you need to change the speedometer gear, or buy a speedcal to adjust the speedometer and odometer after a gear or tire size change from stock.

1+1=2 [Smile]

Posted by norcalstangman (Member # 8387) on :

LMAO
funny stuff. he's got a 94 cobra nd rearend specialties told him there's not speed gear combo for 4.30s. he also go 18s on it. ever since the install he's noticed that da odometer has been goin faster [Mad]

Posted by Blind (Member # 3052) on :

quote:
Originally posted by norcalstangman:
LMAO
funny stuff. he's got a 94 cobra nd rearend specialties told him there's not speed gear combo for 4.30s. he also go 18s on it. ever since the install he's noticed that da odometer has been goin faster

http://www.americanmuscle.com/speed-calibrator-94-04.html

you really can't rely on a shop to tell you everything that you can do to a mustang.

Posted by JohnB (Member # 969) on :

This post is still going?? [Confused]

Speaking from experience (I have just a lil bit installing gears), a extended break in period (100+ miles) is rediculous. If they are done correctly, there will not be a problem. 7-10 miles of freeway speeds (65+) will heat them up to face the gear...let the car cool for 10-15 minutes...and that's it. Remember though, everyone's opinion is different...
Brand new car rears don't have a extended break in period, why would your BRAND NEW gears have one? It's not a engine where you are concerned about piston rings seating correctly or worrying about sufficient oil pressure. I get 5-10 PMs a month asking me about this. [Wink]

Posted by 03SVTPower (Member # 518) on :

quote:
Originally posted by JohnB:
This post is still going??

Speaking from experience (I have just a lil bit installing gears), a extended break in period (100+ miles) is rediculous. If they are done correctly, there will not be a problem. 7-10 miles of freeway speeds (65+) will heat them up to face the gear...let the car cool for 10-15 minutes...and that's it. Remember though, everyone's opinion is different...
Brand new car rears don't have a extended break in period, why would your BRAND NEW gears have one? It's not a engine where you are concerned about piston rings seating correctly or worrying about sufficient oil pressure. I get 5-10 PMs a month asking me about this.

thanks for clearing that up, maybe now the douche's who say there is a 500 mile break in can say, sorry and I was right......again!

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