rear gear ??

mustanggt_50 · 01-06-2003, 07:00 PM

i just bought myself an 89 Coupe 5.0 5spd. this is the first 5spd car ive had that i'm actually gonna modify and it already has a complete exhaust, so i want to put some better gears in it. im stuck between 3.55's and 3.73's, and i know alot of ppl recommend 3.55's with a 5spd, but i'd just like to hear some of your opinions on the matter.

bigred90gt · 01-06-2003, 07:25 PM

I have 3.73's and their great. I have never driven a car with 3.55's, so I have no basis for comparison.

Caymon

93 Cobra needs input · 01-06-2003, 07:28 PM

I've had both, 3.55's in a 90 GT and currently have 3.73 in my 93 Cobra and I definitly like the 3.73's better their really isn't that much difference at 65mph roughly 300 rpms. The 3.73's at the track help a ton leaving the line with slicks, if that is a goal of yours in the future, hope this helps.

MEDIK418 · 01-06-2003, 11:47 PM

I put 3:55's in the 89 about 2years ago. I thought those would be perfect for a street car and they made a BIG difference in the performance. I still like em but my youngest son has 3:73's in the green thing and there's even mo-bettah stuff in them. If I had it to do over, I'd do 3:73's in anything I put gears in.

squid · 01-07-2003, 09:11 AM

I have had my 3.73's for a month now and so far I really like them. The change in rpm at highway speeds wasnt nearly as bad as I thought it would be. If your not gonna do much racing go with the 3.73's if you are gonna race it you may want to look at 4.10's especially if your motor mods move your torque and hp band up into the higher rpm's.

mustanggt_50 · 01-07-2003, 12:08 PM

Thanx for the input guys. its much appreciated. so it looks like im throwing in my 3.73's, should be in by next month all depending on the weather, its damn cold outside.

crazypete · 01-07-2003, 12:53 PM

Dude, I do massive highway driving all the time and I run 3.73's. I have a carb and I get ~20 mpg hwy slightly underjetted but with a 95 power valve. If I had to do it all over again, then I would hit 4.11's. I pull...if I remember correctly off the top of my head: 65mph at 2000 in 5th with my 3.73's .

My first stang must have had 4.11's or 4.30's in it cause it pulled like 3500k rpms at 85 (I always assumed that that was what mustangs felt like and I was in for a surprise when I got a 3.08 equipped car, what a slothly feeling ride). What a difference. With FI, I got 24 mpg hwy. I could chirp the tires easily in 2nd.

01-06-2003, 07:00 PM	#1
mustanggt_50 Registered Member Join Date: Dec 2002 Location: Ontario Canada Posts: 91	rear gear ?? i just bought myself an 89 Coupe 5.0 5spd. this is the first 5spd car ive had that i'm actually gonna modify and it already has a complete exhaust, so i want to put some better gears in it. im stuck between 3.55's and 3.73's, and i know alot of ppl recommend 3.55's with a 5spd, but i'd just like to hear some of your opinions on the matter. __________________ 87 GT T-roof (needs paint) lol, rebuilt motor and trans, AOD - stage 2 shift kit, 3.73 gears - auburn posi, Dynomax Super Turbo Cat Back, FRPP 155lph fuel pump, K&N filter - air silencer removed, subframe connectors, strut tower brace. 88 GT T-roof 1989 LX Coupe 5.0 - 5spd Rice Haters Club member#105

01-06-2003, 07:25 PM	#2
bigred90gt 2 Stangs in the Stable Join Date: Apr 2002 Location: Baytown, TX Posts: 1,209	I have 3.73's and their great. I have never driven a car with 3.55's, so I have no basis for comparison. Caymon __________________ '90 GT Under construction Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!! 04 F-150 STX 4.2L 5 spd Rice Haters Club Member #128

01-06-2003, 07:28 PM	#3
93 Cobra needs input Registered Member Join Date: Oct 2001 Location: Madelia,MN USA Posts: 58	I've had both, 3.55's in a 90 GT and currently have 3.73 in my 93 Cobra and I definitly like the 3.73's better their really isn't that much difference at 65mph roughly 300 rpms. The 3.73's at the track help a ton leaving the line with slicks, if that is a goal of yours in the future, hope this helps. __________________ 331 stroker, JE 8.5:1 pistons, H-beam rods, steel crank, main cap, msd with 3step, BBK ceramic long tubes,TKO, 4.30's, motorsport Z303, Victor Jr aluminum heads, crane gold 1.6, southside lift bars, 90/10 front, 50/50 rear, centerforce dual friction clutch, Vortech S-trim soon.

01-06-2003, 11:47 PM	#4
MEDIK418 Registered Member Join Date: Mar 1999 Location: Amarillo, Texas, USA Posts: 780	I put 3:55's in the 89 about 2years ago. I thought those would be perfect for a street car and they made a BIG difference in the performance. I still like em but my youngest son has 3:73's in the green thing and there's even mo-bettah stuff in them. If I had it to do over, I'd do 3:73's in anything I put gears in. __________________ 1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet. Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.

01-07-2003, 09:11 AM	#5
squid Registered Member Join Date: Sep 2002 Location: Dayton, OHIO Posts: 73	I have had my 3.73's for a month now and so far I really like them. The change in rpm at highway speeds wasnt nearly as bad as I thought it would be. If your not gonna do much racing go with the 3.73's if you are gonna race it you may want to look at 4.10's especially if your motor mods move your torque and hp band up into the higher rpm's. __________________ 93'GT 5spd. Underdrives, FMS clutch, adjustable quadrant,Flowmasters, Kenny Brown subframe connectors, 3.73 gears, Steeda Tri-Ax. JBA shorties, BBK h-pipe. More to come.

01-07-2003, 12:08 PM	#6
mustanggt_50 Registered Member Join Date: Dec 2002 Location: Ontario Canada Posts: 91	Thanx for the input guys. its much appreciated. so it looks like im throwing in my 3.73's, should be in by next month all depending on the weather, its damn cold outside. __________________ 87 GT T-roof (needs paint) lol, rebuilt motor and trans, AOD - stage 2 shift kit, 3.73 gears - auburn posi, Dynomax Super Turbo Cat Back, FRPP 155lph fuel pump, K&N filter - air silencer removed, subframe connectors, strut tower brace. 88 GT T-roof 1989 LX Coupe 5.0 - 5spd Rice Haters Club member#105

01-07-2003, 12:53 PM	#7
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	Dude, I do massive highway driving all the time and I run 3.73's. I have a carb and I get ~20 mpg hwy slightly underjetted but with a 95 power valve. If I had to do it all over again, then I would hit 4.11's. I pull...if I remember correctly off the top of my head: 65mph at 2000 in 5th with my 3.73's . My first stang must have had 4.11's or 4.30's in it cause it pulled like 3500k rpms at 85 (I always assumed that that was what mustangs felt like and I was in for a surprise when I got a 3.08 equipped car, what a slothly feeling ride). What a difference. With FI, I got 24 mpg hwy. I could chirp the tires easily in 2nd. __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

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