Question:
Are all Camaros & Firebirds 10 bolt factory rears come standard with 26 spline.
Or do some come factory with 28 spline. And is there an easy way to tell?

 

From all I've seen, all the 90-92 rear ends came with 28 spline axles. A few 89's had them, but they were the exception and only those at the very end of the year's run...

 

Although a previous owner could have easily upgraded a 82-89 to 28 spline axles. The only way to know for sure is to pull the axles and count the splines.

 

If you're asking about your '88 rear end, its going to be a 26 spline if its a 10-bolt.

9-bolt rear ends have 28 spline axles, and '90 and newer 10-bolts have 28 splines also.

 

Thanks for the info. guys.
As far as my rearend goes its actually from a Firebird a 3:73 10 bolt, but I don't know what year the car was it came off.

 

[QUOTE=Americanmouse;4015437]Thanks for the info. guys.
As far as my rearend goes its actually from a Firebird a 3:73 10 bolt, but I don't know what year the car was it came off.[/QUOT

If it is a stock 3:73 it is from a pre 85 model is sure to have 26 spline axle shafts.

 

As far as I know the guts are stock, although I did crack it open when I got it, and the gear teeth had a nice edge to them at the time. And yes it came directly off the Firebird, as the owner at the time said he'd swap my 9 inch 2:73 for his 10 bolt 3:73. He said he wanted better economy rearend.

Thanks again everyone!

 

You probably mean your 9 bolt 2.77 for his 10 bolt 3.73