rear gear ratio

~The Jester~ · 02-16-2007, 09:48 AM

I was running 4.30's with my 347/TKO and was SERIOUSLY considering stepping down to 4.56's!!!

"Don't fear the gear." But like everyone is telling you, it all depends on what the car is used for, trans, tire size, etc etc.

Ieatcamaros · 02-19-2007, 07:22 PM

With an AOD definitely go with the 4.10's. I have 4.10's in mine with the 5 speed and I get 12 mpg with that 750 holley atop the intake. I am thinking of making the switch to 4.30's or 4.56's. If you have a 5 speed, you may want to step down to 3.73's as first gear in a stock t5 is nearly useless for driving around town.

andy669 · 02-19-2007, 08:43 PM

The 94 GT auto's had an AOD-E and a computer with a 5500rpm rev limiter. No way in hell would I put 4.10's in them. With a stock sized tire 95~97 mph in drive is all you are going to get. A 3.73 is a much better choice.

Andy

goodyear1984 · 03-06-2007, 04:39 AM

355 or 373 5 speed.........410 auto...i would only get the ford racing gears they are machined very well and usally dont need to shim them ..get some new clutchs for them limited slip(when i do the clutchs i usally add an extra .15 shim so its tighter)...make sure u check the pinon depth/pattern and the lash(around .08 thou)
good luck...if u need some good instructions on installing them i can e-mail u some pointers

DaLe five OH! · 01-24-2008, 11:13 PM

3.73's for a AOD, thats what i'm runnin and i'm very happy with them so far

88workcar · 04-01-2008, 05:24 PM

Decide WHAT this car will be used for primarily. Stick to that, all your decisions will fall into place for you.

I love my 4.30s, And I got 23mpg with them. Light car, big tire, no accessories, polite driving on long trips. It can be done.

exgmguy · 12-01-2008, 11:22 AM

It sounds like you have a basically stock car. I would say 3.73's will make you happy for a long time.

02-16-2007, 09:48 AM	#1
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: rear gear ratio I was running 4.30's with my 347/TKO and was SERIOUSLY considering stepping down to 4.56's!!! "Don't fear the gear." But like everyone is telling you, it all depends on what the car is used for, trans, tire size, etc etc. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

02-19-2007, 07:22 PM	#2
Ieatcamaros Domestic Rice really sucks! Join Date: Apr 2002 Location: KY Posts: 973	Re: rear gear ratio With an AOD definitely go with the 4.10's. I have 4.10's in mine with the 5 speed and I get 12 mpg with that 750 holley atop the intake. I am thinking of making the switch to 4.30's or 4.56's. If you have a 5 speed, you may want to step down to 3.73's as first gear in a stock t5 is nearly useless for driving around town. __________________ The sig says it all.

02-19-2007, 08:43 PM	#3
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: rear gear ratio The 94 GT auto's had an AOD-E and a computer with a 5500rpm rev limiter. No way in hell would I put 4.10's in them. With a stock sized tire 95~97 mph in drive is all you are going to get. A 3.73 is a much better choice. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

03-06-2007, 04:39 AM	#4
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: rear gear ratio 355 or 373 5 speed.........410 auto...i would only get the ford racing gears they are machined very well and usally dont need to shim them ..get some new clutchs for them limited slip(when i do the clutchs i usally add an extra .15 shim so its tighter)...make sure u check the pinon depth/pattern and the lash(around .08 thou) good luck...if u need some good instructions on installing them i can e-mail u some pointers __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

01-24-2008, 11:13 PM	#5
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	Re: rear gear ratio 3.73's for a AOD, thats what i'm runnin and i'm very happy with them so far __________________ ZEX

04-01-2008, 05:24 PM	#6
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Re: rear gear ratio Decide WHAT this car will be used for primarily. Stick to that, all your decisions will fall into place for you. I love my 4.30s, And I got 23mpg with them. Light car, big tire, no accessories, polite driving on long trips. It can be done. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

12-01-2008, 11:22 AM	#7
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Re: rear gear ratio It sounds like you have a basically stock car. I would say 3.73's will make you happy for a long time. __________________ 1988 Mustang GT stock bottom 302, C4 10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN 1989 Mustang notchback Warmed up 306 with a Procharger.

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