Transmissions and Drivetrain Need help with your trans? Problems with your axle?

will a 89 700r4 work in a 91 z28?

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Old Jan 11, 2004 | 05:55 PM
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mckenzie's Avatar
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From: tn. usa
will a 89 700r4 work in a 91 z28?

hello, will a 1989 700r4 work in a 91 z28? i think the 89 has a cable speedometer, and the 91 has an electric speedometer. will i have to swap rear tailshafts? anybody know what all is involved? thanks, tom
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Old Jan 12, 2004 | 12:09 AM
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From: Newark, DE
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
If the trans is from an '89 Camaro then it is a mechanical drive. If it's from a Firebird it's electric. Your '91 is electric. Just swap the tailshaft housing and the speedo gear on the tailshaft of you trans onto the new one and you're good to go.
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Old Jan 12, 2004 | 12:57 AM
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: will a 89 700r4 work in a 91 z28?

Originally posted by mckenzie
hello, will a 1989 700r4 work in a 91 z28? i think the 89 has a cable speedometer, and the 91 has an electric speedometer. will i have to swap rear tailshafts? anybody know what all is involved? thanks, tom
If it's different tooth count, you need the drive on the output shaft of your 91 trans. Your VSS assy. will swap directly into the 89 tailhousing. The tailhousings will be identical if they are both from f-bodies.

700-R4 truck tailhousings are bare. B/D have a mount provision on the underside. Y are weird (as are some owners of same.) F are setup for a tq. arm.

Everything else should be cool as long as they're both Chevrolet pattern (and not from a V6 for example.)
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