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Old 04-27-2014, 09:07 PM
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Car: 1985 pontiac firebird t-tops
Engine: 350 with 305 heads
Transmission: t-5
Axle/Gears: 4th gen rearend with 3.23 gears
gear question
i am kind of new here. i just picked up a 85 t/a. the kid told me it has a 4th gen 6 speed rearend with 3.23 gears. is there any way to verify this?
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Old 04-28-2014, 06:53 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: gear question
Originally Posted by blackd-out z28
i am kind of new here. i just picked up a 85 t/a. the kid told me it has a 4th gen 6 speed rearend with 3.23 gears. is there any way to verify this?
The fourthgen rear is wider by several inches. Drop the diff cover and take a peek at the gears. The following FAQ provides the ratio numbers.

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Old 04-28-2014, 04:12 PM
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Car: 1985 pontiac firebird t-tops
Engine: 350 with 305 heads
Transmission: t-5
Axle/Gears: 4th gen rearend with 3.23 gears
Re: gear question
that explains why it sticks out so much in the rear
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Old 04-28-2014, 04:12 PM
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Car: 1985 pontiac firebird t-tops
Engine: 350 with 305 heads
Transmission: t-5
Axle/Gears: 4th gen rearend with 3.23 gears
Re: gear question
and why the speedo is off
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Old 04-28-2014, 08:52 PM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: gear question
Here's the link I neglected to post above:

https://www.thirdgen.org/forums/tran...-10-bolts.html

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Old 04-29-2014, 07:08 AM
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Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: gear question
Did you maintain the stock tire height? because changing that can throw the speedometer off too.
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Old 04-29-2014, 09:31 AM
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Car: 1985 pontiac firebird t-tops
Engine: 350 with 305 heads
Transmission: t-5
Axle/Gears: 4th gen rearend with 3.23 gears
Re: gear question
thinks its lowered 2"
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Old 04-29-2014, 10:01 AM
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Re: gear question
Not the car, the tires. If you change the diameter of the tires it will change the speedometer reading.
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Old 04-29-2014, 01:14 PM
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Car: 1985 pontiac firebird t-tops
Engine: 350 with 305 heads
Transmission: t-5
Axle/Gears: 4th gen rearend with 3.23 gears
Re: gear question
its go 235/55/17 with a fourth gen rear with 3.23 gears
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