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11-10-2006, 05:30 PM #1
which factory rear end do i have?
i have a 02 z28 and i was told that i have a stock 3.73 im wondering which rear end i have cause when im cruizing at like 75-85 mph my tach is almost at 2700-3000 rpm . how can i tell help
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11-10-2006, 06:28 PM #2
- Join Date
- Sep 2005
- Location
- Bakersfield/Long Beach Ca
- Age
- 37
- Posts
- 886
YJ- 04 GTO M6
If you have an A4...then you would have higher gears than 323's because at 80mph im below 2500 RPM's. You might have 342's if the previous owner blew his rear end and found a M6 Fbody.
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11-12-2006, 06:16 AM #3
I have a 3:73 gear along with an A4. At 60 MPH the RPM'S will be 3000 with the trans in D. Hope this helps.
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11-12-2006, 06:29 AM #4
- Join Date
- Jul 2005
- Location
- Jacksonville, FL
- Posts
- 2,723
Look at the calculator at www.f-body.org/gears/
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11-12-2006, 08:36 AM #5
- Join Date
- Nov 2006
- Location
- Broken Arrow, OK
- Age
- 49
- Posts
- 23,345
Pewter metallic- 2000 Camaro SS
GM didn't put 3:73 rearends in fbodies from the factory. If your car is a T-56(6 speed) transmission then you have a 3:42 rearend. If your car is a 4l60E(automatic) transmission then you have a 3:23 or 2:73 rearend. The calculator link listed above should determine for you which rearend you have. You could also look at the RPO codes on the driver side door and determine your gearing.
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11-12-2006, 11:54 AM #6
Also if a previous owner did put aftermarket gears in your speedo could be off...might wanna check that out.
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11-12-2006, 01:48 PM #7
I have a 99 M6 and in sixth gear my rpm's are at 2100 when doing 90
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11-12-2006, 05:02 PM #8
that sounds about right for a m6
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