gearing?

HiFlow5 0 · 07-12-2001, 03:38 PM

ok i have a 89 GT and i want to put new rear end gears in it. i have a Auto with a shift kit and have heard many say 3.73's are the best for an auto. i do as much highway driving as i do street driving, so i don't want to over rev the engine at fast speeds, would 3.55's be better? i do want a quicker launch cause these 2.73's arn't cutting it when i street race! other cars usually get a jump on me off the line. my car just doesn't feel powerfull when i start. if i leave my car in 1st and shift it myself i feel way more power once i hit above 3500 rpm's, would a stall converter be to my advantage? any input would be great!!!

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89 GT, Trickflow intake, Crane (E-type) cam, 70Tb, 75MAF, 1.6 Rockers, Pulleys, MAC headers and H-pipe Dynomax mufflers, K&N, 3 core radiator, custom interior, cobra R rims

Smokedawg · 07-12-2001, 03:45 PM

With that auto, the smallest gear I would get would be a 3:73. They are pretty good for road driving. If it was me, I would go with a 4:10. Good Luck

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347 Stroker Motor: Balanced, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley AFPR, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 73mm Vortech MAF, 70mm TB, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, AC and Smog del, rear seat del.

smokedchevy · 07-12-2001, 11:11 PM

I'd probably go with 4:10's too. Although if it's your only street car you might want to stay with 3:73's. After all, gas is getting up there in price. A stall converter would be a big advantage. You can't go too big on the street cause you'll cook your tranny, but you could probably get away with a 10" or 10 1/2" converter. I have a 9" converter in my 65 stang and it's a bit much for the street. Converters work better with slicks. You can foot brake it or flash the converter to launch your car. Since I assume you have street tires, flashing the converter would probably just make you go up in smoke. Still, with a little practice, you could probably launch your stang at around 2600-2700 Rpm on the brakes. You'd just have to ease it out of the hole. At the track with slicks, a converter with gears would probably shave about 7 tenths off your E.T.

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92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters

NITRO911 · 07-13-2001, 02:40 PM

STOP WHERE YOU ARE!
How can you people even considder 4.10!
I have 4.11 in my 70 coronet 383 and I tell you, I can never take that thing out of the city! Granted, it will smoke em for a block but the trade off is way too great.

I too am looking for gears for my 88 LX 5.0 but my toss up is between the 3.55 and 3.73.
With the T-5, 3.73 may be tollerable, I just don't know.
(my dimes worth)

Rev · 07-13-2001, 03:18 PM

Hey Nitro, I believe we're talking overdrive on this one. On the '70 Coronet or my '66 Stang we don't want 4.10's for street driving. With .67 OD that makes like a 2.70 on the highway. Just a thought.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

Fostang · 07-13-2001, 08:26 PM

Over drive what a wonderful thing.

------------------
67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s

07-12-2001, 03:38 PM	#1
HiFlow5 0 Registered Member Join Date: Mar 2000 Location: Springfield, Ma, usa Posts: 706	gearing? ok i have a 89 GT and i want to put new rear end gears in it. i have a Auto with a shift kit and have heard many say 3.73's are the best for an auto. i do as much highway driving as i do street driving, so i don't want to over rev the engine at fast speeds, would 3.55's be better? i do want a quicker launch cause these 2.73's arn't cutting it when i street race! other cars usually get a jump on me off the line. my car just doesn't feel powerfull when i start. if i leave my car in 1st and shift it myself i feel way more power once i hit above 3500 rpm's, would a stall converter be to my advantage? any input would be great!!! ------------------ 89 GT, Trickflow intake, Crane (E-type) cam, 70Tb, 75MAF, 1.6 Rockers, Pulleys, MAC headers and H-pipe Dynomax mufflers, K&N, 3 core radiator, custom interior, cobra R rims

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07-12-2001, 03:45 PM	#2
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	With that auto, the smallest gear I would get would be a 3:73. They are pretty good for road driving. If it was me, I would go with a 4:10. Good Luck ------------------ 347 Stroker Motor: Balanced, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley AFPR, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 73mm Vortech MAF, 70mm TB, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, AC and Smog del, rear seat del.

07-12-2001, 11:11 PM	#3
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	I'd probably go with 4:10's too. Although if it's your only street car you might want to stay with 3:73's. After all, gas is getting up there in price. A stall converter would be a big advantage. You can't go too big on the street cause you'll cook your tranny, but you could probably get away with a 10" or 10 1/2" converter. I have a 9" converter in my 65 stang and it's a bit much for the street. Converters work better with slicks. You can foot brake it or flash the converter to launch your car. Since I assume you have street tires, flashing the converter would probably just make you go up in smoke. Still, with a little practice, you could probably launch your stang at around 2600-2700 Rpm on the brakes. You'd just have to ease it out of the hole. At the track with slicks, a converter with gears would probably shave about 7 tenths off your E.T. ------------------ 92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters

07-13-2001, 02:40 PM	#4
NITRO911 Registered Member Join Date: Jul 2001 Posts: 1	STOP WHERE YOU ARE! How can you people even considder 4.10! I have 4.11 in my 70 coronet 383 and I tell you, I can never take that thing out of the city! Granted, it will smoke em for a block but the trade off is way too great. I too am looking for gears for my 88 LX 5.0 but my toss up is between the 3.55 and 3.73. With the T-5, 3.73 may be tollerable, I just don't know. (my dimes worth)

07-13-2001, 03:18 PM	#5
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Hey Nitro, I believe we're talking overdrive on this one. On the '70 Coronet or my '66 Stang we don't want 4.10's for street driving. With .67 OD that makes like a 2.70 on the highway. Just a thought. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

07-13-2001, 08:26 PM	#6
Fostang Registered Member Join Date: Feb 2001 Location: Stockton, Ca Posts: 599	Over drive what a wonderful thing. ------------------ 67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s