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Rear

Jim D

Well-known member
Joined
Feb 11, 2002
Messages
140
Location
Mickleton, NJ
Corvette
1987 yellow vert
How can I tell what rear my 93 auto has in it. I can't find the rpo codes,and don't want to shell out the 75 or 80 bucks the Corvette Museum wants thanks Jim
 

BigRed

Well-known member
Joined
May 23, 2001
Messages
948
Location
Edmonton
Corvette
1985 Bright Red Rocket
Old fashion way is to take off the Diff cover during your regular fluid maintence and count the splines. Other than that someone here may be able to help you out without the procedure.
 
Joined
Jun 20, 2002
Messages
2,509
Location
Tallahassee, FL
Corvette
none right now :(
How many RPM's do you run at 70 MPH? You can figure it backwards from there. (or even easier, someone else can reply with their rpm and axle, if it is the same then you know what you have)
 

vms4evr

Well-known member
Joined
Jul 18, 2001
Messages
466
Location
Durham, NC
Corvette
2002 Flat Black Z06
Jim D,
Ok if you have the 2.59 gears it should run something like this.
In Drive, 45mph = 1520rpm, 65mph = 2200rpm
In OverDrive, 65mph = 1540rpm, 84mph=2000rpm
That is an approximation.
If you're 200-400rpm higher in OD then it's probably the 3.07.
Graham
 

Topless

Well-known member
Joined
Nov 12, 2001
Messages
444
Location
San Diego, CA
Corvette
1992 Convt w/hard top; 2004 Z06 Z16; 1962 327/300
You could just jack up the rear end, mark the drive shaft, and then turn your rear wheels one complete turn. All you have to do is count how many times the shaft spins. (A string taped, and marked for each rotation helps with that fractional part.)
 

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