Quick differential question
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,104
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From: Boise Idaho
Quick differential question
I know what gears I have, but a buddy of mine isn't sure what he has in his stock 2000 Z28 Automatic. I've seen a general rule-of-thumb posted about going a certain speed in a certain gear to find out which rear end you have, but I can't find it after searching. Can anyone remind me what the process is, and whether or not this will work in a Z28?
Thanks!
Thanks!
Race Director
Joined: Nov 2005
Posts: 14,553
Likes: 1,548
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Look on his option label in the center console. The codes are as follows: 2.73 = GU2, 3.08 = GU4, 3.23 = GU5, 3.42 = GU6, 3.73 = GT4. Hope that helps. If you can't find the label, post your VIN and I can run it for you.
Race Director
Joined: Apr 2004
Posts: 16,135
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From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
If I am not mistaken (had a 1999 Z28 M6), but the option for an upgrade in the diff was for the vette, but the F-BODY was standard 2:73 (A4) and 3:42 (M6) and nothing outside of this, unless you upgraded with an aftermarket gearing.
Team Owner
Joined: Apr 2001
Posts: 54,204
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From: S.W. Ohio. . . . . . NRA Life Member
Originally Posted by JeepTJ
In the vette A4s.
70 mph in 3rd.
2700 rpm = 2:73
3100 rpm = 3:15
70 mph in 3rd.
2700 rpm = 2:73
3100 rpm = 3:15
it's 75mph.
Any car with factory-heigth rear tires - and in the tranny gear that is a 1 to 1 ratio - the above forumla will work.
For the C5,it happens to be 3rd gear for the A4 and 4th gear for the six speed.
