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Drive/driven gear question

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Old 08-26-2011, 11:17 AM
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Car: 85 Camaro Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.42
Drive/driven gear question

Quick question guys. 85 Camaro with 700R4 and 3.42 rear, 245/50/16

I am getting two different sizes of combonation gears I need from different sites versus doing my own calculations.

Previous owner swapped rear ends, so speedo is off.

Can someone please assist me with the proper gears I need to make my speedometer accurate?

Last edited by coryprine; 08-28-2011 at 02:08 PM.
Old 08-26-2011, 06:19 PM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Drive/driven gear question

I'm guessing the tires are 245/50/16

Im looking in my Pontiac parts book, I'm seeing
trans code /drive gear/ driven gear
85 3.42
MD8/ 15/ 41 or 42


89 3.42
MD8 / 15/ 41
MB1 / 07/ 19

The 85 also does't list 245/50/16s soo I looked at the 89s and they have the same gears listed 4 several dif sized tires..

let us know..
Old 08-27-2011, 03:12 AM
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Car: 85 Camaro Z28
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Axle/Gears: 3.42
Re: Drive/driven gear question

Tire size is in original post 245/50/16

Last edited by coryprine; 08-28-2011 at 02:06 PM.
Old 08-27-2011, 06:42 AM
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Re: Drive/driven gear question

Where the heck did you find tires that size, and why the heck would you put them on a third gen?
You need an 18 tooth drive, and a 45 tooth driven.
Old 08-28-2011, 02:06 PM
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Car: 85 Camaro Z28
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Axle/Gears: 3.42
Re: Drive/driven gear question

Corrected tire size, I misread.... sorry

According to my calculator with the corrected size I am needing 15/40..... am I correct?
Old 09-05-2011, 12:12 AM
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Car: 85 Camaro Z28
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Axle/Gears: 3.42
Re: Drive/driven gear question

TTT
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