Tony89GTA

iTrader: (7)

Is the t5 out of tpi car the same gearing as one from a tbi car?

I heard most GM cars came with a .62 overdrive and some came with .73. I was thinking of installing 3.70 gears and i was wondering is it posible to change my overdrive gearing from .73 to .62 ?


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89 GTA 350 5-speed
Jet hot coated SLP headers,flowmaster force 2,no cat's,SLP cold air,MSD 6al,jet chip stage 2,march pulleys,ported plenum,air foil,B&M ripper shifter,180 stat,alston SFC,spohn LCA relocation brackets,MAT relocation kit,free mods.

0-60 5.48s
E.T. 14.02@98.9MPH (corrected)

tesla042

not that this answers your question, but I've had both. My (i assume!) stock (not WC t5) tranny had the .73, and my new (rebuilt) WC t5 has .62. (i'm tpi, btw)

The mech said the stock was from an 89 (my car's 91... I don't know what's up with this unless someone had it replaced at some point)..

Honestly, I'd rather have the .73.. With my 3.08 gears, I can take 4th up to ~125 or so... but that's not enough to get everyone! Once I shift into fifth now at .62, I've lost.

Still, with crazyass monster torque, I don't often need to shift out of fifth to pass people... And it should be good for better gas mileage...

Just my thoughts
-Tesla

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91 T/A 305
STB, Airfoil, Hooker cat-back, pseudo-cold air to K&N, Accel coil, !cat, !smog pump.
300 lb*ft of rice churning power.

Kevin91Z

iTrader: (1)

I believe the 3.08 geared cars (which is all TBI's and some TPI's) got the 2.95 first geared and .63 5th geared T5, and the 3.42 geared cars (which is all TPI's) got the 2.75 first gear and .73 5th gear. I do not know how the T5 gears are in the carb'd and/or the V6 cars.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

badbird88

yes you can change the 5th gear. I forgot which company told me I could and the price.

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1988 TA 300+hp 350 w/ TBI and Holley TB unit,
WC T-5, 3.42 gears w/ Auburn posi. MSD 6A, edelbrock TES headers, dynomax 3" cat and cat-back system, ACCEL coil, polyurethane bushings all around, aluminum driveshaft, Mr. Gasket open air cleaner.

2000 GMC Sierra Regular Cab Stepside
285hp 5.3L w/ 3.42 gears and locking diff.

LT90RS

The 1LE and B4C cars got the .70 5th gear and a 3.23 gear for the rear end.
All others was suppost to get the .63 5th gear.
All T-5's after 87 where World class trannies.
You should be able to change the gears with GM parts.

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90RS 305TBI\5-speed
Fastchip
Open Air Cleaner
Lakewood LCA & Panhard,10 Bolt Posi-Disk Rearend 3.42's
KYB all around
Energy Supension front end kit
36/24 Sway bars
Dual Fans
In the works-
Elenbrock TBI
LT-1 Cam
Roller Rockers
SSM subframe connectors

Petes 84Z28

If you have a V8 trans with the .73 OD ratio, and want the .62 ratio, find a V6 unit and swap over the two OD gears onto the V8 tranny...next time I pull mine out, I'm definitely swapping them in the interest of better gas mileage. With my 3.42 gears, they will lower a 2000 cruise rpm down to about 1650rpm.

Pete

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Pete's Place
Now at HiOutput.com<P ALIGN="center"><IMG SRC="http://www.hioutput.com/pete/83SC.gif" TITLE="Pete's 83 SC">
My 83 SC...(originally V6) 196,500 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, gray interior from an 86 Firebird SE, seats from an 89 Formula, wheels from an 83 Z28, springs and rear bar from an 84 Z28, WS6 front bar, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, Accel HEI Supercoil and foam air filter, custom air induction through 84 Z28 hood.....best ET on paper is 14.935@94.14 (corrected is 14.79@95.75)</P>