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Author
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Topic: Stock gears question
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RAP66
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Member # 3360
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posted
 
 
I have been looking and can't find the information I need. I have a stock 91GT, what gears are in the diff??? 3.08??
I'm looking to upgrade a little bit what do you recommend? 3.27, 3.55??
This is my daily driver so I dont want to go radical, something that will put more power down and still be able to drive on the freeway.
Thanks
Rich
[ April 02, 2004, 04:06 AM: Message edited by: hard jokur ]
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91GT Kurgan Tuned:12lbs of boost 492.4 rwhp / 483.1 rwtq
http://killcarb.org/
www.fordstrokers.com
Posts: 893 | From: SF Bay Area | Registered: Oct 2003
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I'm assuming this is a 5 speed?....
The easy way to find your gear ratio is to read the tag on the diffential cover....It's attached by one of the cover bolts...
There is a tag on the door which gives you your gear info, but I forget which letters mean what...Maybe someone can help me out on that one...
Anyway, I loved my 3.55's in my 94 and I plan on doing 3.55's on my next 5.0 Mustang...If you installed 3.27's IMO it wouldn't even be worth it...I consider 3.55's the bare minimum.... ![[patriot]](graemlins/patriot.gif)
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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RAP66
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Member # 3360
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posted
that tag was a nice rusty stub... an I wasnt thinking when we replaced the fluid.
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91GT Kurgan Tuned:12lbs of boost 492.4 rwhp / 483.1 rwtq
http://killcarb.org/
www.fordstrokers.com
Posts: 893 | From: SF Bay Area | Registered: Oct 2003
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graylx
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Member # 3919
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posted
I like my 3.55s. I haven't bought the correct gear for the speedometer, but I think I am around 2,500 rpm at 80 mph, which isn't all that bad. I noticed quite a bit of pick up from my stock gears (I think they were 3.08s). My friend is extremely happy with his 3.73s, though.
BTW, does anybody know the number of teeth for the speedometer gear for 3.55s?
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2012 Mustang GT
1989 Mustang LX 5.0 Notch
1995 Impala SS
Posts: 891 | From: Fresno | Registered: Dec 2003
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graylx
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Member # 3919
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posted
Okay, sorry, I'm retarded. To address your original question. You can tell the gears in your rear end (provided that no prior owner had changed them) by looking at the Vehicle Safety Compliance Label. It is located on the driver's side door. It is the big white label. Pretty hard to miss. Anyway, if you scan to the far right hand bottom, you will observe a series of letters. Pay attention to only the letter or number under AX!
Chilton's lists the following axle options for the 1991 Mustang.
8 = 2.73 Axle Ratio Conventional
M = 2.73 Axle Ratio Limited-Slip
Y = 3.08 Axle Ratio Conventional
Z = 3.08 Axle Ratio Limited-Slip
F = 3.45 Axle Ratio Conventional
R = 3.45 Axle Ratio Limited-Slip
5 = 3.27 Axle Ratio Conventional
E = 3.27 Axle Ratio Limited-Slip
6 = 3.73 Axle Ratio Conventional
W = 3.73 Axle Ratio Limited-Slip
2 = 3.55 Axle Ratio Conventional
K = 3.55 Axle Ratio Limited-Slip
Hope this helps!
Mark
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2012 Mustang GT
1989 Mustang LX 5.0 Notch
1995 Impala SS
Posts: 891 | From: Fresno | Registered: Dec 2003
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
Yeah, thanks Mark that's what I was talkin about...
For you 89 W/T5 you'll need the Black 20tooth FRPP gear for 3.55's...
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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RAP66
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Member # 3360
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posted
quote:
Originally posted by graylx:
Okay, sorry, I'm retarded. To address your original question. You can tell the gears in your rear end (provided that no prior owner had changed them) by looking at the Vehicle Safety Compliance Label. It is located on the driver's side door. It is the big white label. Pretty hard to miss. Anyway, if you scan to the far right hand bottom, you will observe a series of letters. Pay attention to only the letter or number under AX!
Chilton's lists the following axle options for the 1991 Mustang.
8 = 2.73 Axle Ratio Conventional
M = 2.73 Axle Ratio Limited-Slip
Y = 3.08 Axle Ratio Conventional
Z = 3.08 Axle Ratio Limited-Slip
F = 3.45 Axle Ratio Conventional
R = 3.45 Axle Ratio Limited-Slip
5 = 3.27 Axle Ratio Conventional
E = 3.27 Axle Ratio Limited-Slip
6 = 3.73 Axle Ratio Conventional
W = 3.73 Axle Ratio Limited-Slip
2 = 3.55 Axle Ratio Conventional
K = 3.55 Axle Ratio Limited-Slip
Hope this helps!
Mark
![[burnout]](graemlins/burnout.gif) Thank you
I will check after work, today I'm driving the Cobra
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91GT Kurgan Tuned:12lbs of boost 492.4 rwhp / 483.1 rwtq
http://killcarb.org/
www.fordstrokers.com
Posts: 893 | From: SF Bay Area | Registered: Oct 2003
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PeNiNsula302
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Member # 1061
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posted
go with 3:73's , they arent too radical at all and you will notice an incredible change
Posts: 3423 | Registered: Mar 2002
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JoeT
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Member # 298
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posted
unless you're making over 350 to the wheels, anything less than 4.10s is weak ![[Cool]](cool.gif)
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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FasterDamnit
Bad Attitude
Member # 442
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posted
quote:
Originally posted by shade-:
unless you're making over 350 to the wheels, anything less than 4.10s is weak
Ratio Snob... ![[Razz]](tongue.gif)
3.73's or 4.10's. Or maybe split the diff and go 3.90's.
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'92 LX T5
Looked stock, went 11's 11.90 at 115mph.
'65 Mustang 347
www.fordmuscle.com
Livin' in the Carolina Pines
Posts: 2971 | From: NorCal | Registered: Sep 2001
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Blind
2.3L
CAFords OG
Member # 3052
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posted
my coupe with 3.73's pulls hard enough for me
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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slidewayz94
CAFords OG
Member # 3101
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posted
my stock gears were 2.73's went to 3.55's huge diffrence but may be swapping out for some 3.73's soon
Posts: 4251 | From: Sac | Registered: Jul 2003
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