02-07-2007, 11:13 AM
| #2 (permalink) |
| Registered Member  Join Date: Aug 2002 Location: SanAntonio, Tx
Posts: 957
|  Re: rear gear ratio Depends on what your looking for, in a heavy car that would be dragracing on sticky tires i would go 4.10's, but I run a gear that is not in your poll which has my vote the 3.90, I find it optimum for my setup running on slicks. For a highway cruiser i say 3.55's imo.
__________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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02-07-2007, 11:32 AM
| #3 (permalink) |
| Registered Member  Join Date: Apr 2001 Location: San Diego, Ca
Posts: 1,315
| Re: rear gear ratio Exactly, alot of consideration is put into what gears to choose from what your intent is with the car. 3.73 aren't so bad on the street IMO, but I run the 4.10's because I use slicks and see more track than street. eitherway, make sure you get a quality set of gears and I suggest having them professionally installed for proper shimming and backspacing, etc..
__________________ 8th Mustang and counting. They are like a disease. Currently in the paint shop. www.Outlaw-Performance.com |
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02-07-2007, 02:12 PM
| #4 (permalink) |
| MW Founder  Join Date: Jun 1995 Location: Farmington Hills, MI
Posts: 19,277
| Re: rear gear ratio During my 302 days I used a 3.73 gear set in my Mustang from lightly modded all the way up to heavily modified, and thought it did a great job overall. It's the middle ground between track and street. Once I built my supercharged 377 stroker though, I dropped down to a 3.55 because it makes so much more torque and the 3.55's are more suited to my powerband.
__________________ Dan McClain, Founder 1991 Mustang GT - Supercharged 377 Stroker 1999 Ford SVT Lightning - Upgraded to 2000 Specs Media Center Gallery - View my member photos |
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02-10-2007, 08:07 AM
| #5 (permalink) |
| Registered Member Join Date: Sep 1998 Location: Oviedo, FL
Posts: 992
| Re: rear gear ratio 3.55 unless it has OD then 3.73 or higher.
__________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic |
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02-12-2007, 01:16 AM
| #6 (permalink) |
| Registered Member  Join Date: Sep 2000 Location: rock hill,S.C. 29730
Posts: 412
| Re: rear gear ratio 4.10's in an auto 3.73's in a 5-speed IMHO
__________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ |
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02-16-2007, 09:48 AM
| #7 (permalink) |
| 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.....  |
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02-19-2007, 07:22 PM
| #8 (permalink) |
| 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.  |
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02-19-2007, 08:43 PM
| #9 (permalink) |
| 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 |
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03-06-2007, 04:39 AM
| #10 (permalink) |
| Registered Member Join Date: Dec 2006 Location: new york
Posts: 419
| 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 11.7 1.61 60ft tons of problems to fix and more money to spend!ahhhhhhh 1992 mustang gt 2000 chevy impala 1994 heavy chevy 4x4 78 century boat 92 skidoo |
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04-01-2008, 06:24 PM
| #12 (permalink) |
| Registered Member  Join Date: Oct 1999 Location: Pierre Part, La. U.S.A.
Posts: 1,838
| 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. 408 @ 6800. Radial tires, 4.30s, 11.34 @ 126.52 so far. Rice Hater # 42 To be old and wise, You must first be young and stupid  I'm somewhere in tthe middle. |
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12-01-2008, 11:22 AM
| #13 (permalink) |
| 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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01-12-2009, 09:32 AM
| #14 (permalink) |
| Registered Member  Join Date: Jan 2009
Posts: 3
| Re: rear gear ratio What gear ratio you choose depends on 2 things .. what are your intentions for the car and what size tire do you plan on running..stock tire height on a fox mustang is 25.6 inches ..every inch of tire height you add or subtract will change your ratio .22 - .25 .. put 4.10 gears in a car and add 2 inches of tire height and all of a sudden you are back to a 3.55 |
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