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Help with gear ratio

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Old 03-03-2019, 07:15 PM
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Car: 1991 Camaro RS
Engine: LS3 w/ HCI
Transmission: Magnum F (T56)
Axle/Gears: 4th gen 3:42 posi rear
Help with gear ratio
SO i picked up a 4th gen rear off of a 1999 z28. Was a manual transmission car so I was expecting a 3.42 gear ratio. Pulled the cover today and gears look great but the stamping was hard to make out. To me it looks like it is 42-11. 3.82 gears don't seem very common so I just wanted to verify with someone that may know more than me about these gears.




Almost looks like 12-11 but clearly that is not correct. So must be 42-11 or 3.82??

Thanks to anyone who can verify.
Last edited by Sdmodified; 03-03-2019 at 07:18 PM.
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Old 03-03-2019, 07:25 PM
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Car: 1988 Iroc
Engine: L98 350
Transmission: 700R4
Axle/Gears: Hawks 8.8 - 3.73
Re: Help with gear ratio
Looks like 12-11-2005. ....is that a date? Are the ratios stamped like that? Sure doesn't look like a 4. Can't you just count the teeth?
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Old 03-03-2019, 08:11 PM
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Car: 1991 Camaro RS
Engine: LS3 w/ HCI
Transmission: Magnum F (T56)
Axle/Gears: 4th gen 3:42 posi rear
Re: Help with gear ratio
Yea, its definitely a 3.42. Just a weird stamp. Must be a newer replacement gear.
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Old 03-05-2019, 12:00 AM
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Re: Help with gear ratio
Looks to me like it says 12 41 ... which is 3.42
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Old 03-05-2019, 12:32 AM
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Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Help with gear ratio
Concur. 12 41. You can see that the flag on the one's have a curve. The diagonal on the 4 does not.

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Old 03-05-2019, 05:20 PM
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Car: 1991 Camaro RS
Engine: LS3 w/ HCI
Transmission: Magnum F (T56)
Axle/Gears: 4th gen 3:42 posi rear
Re: Help with gear ratio
Thanks for the help with this. I am a bit new to these cars so learning as I go.
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