I am under the impression formulas did not come with drum rear ends.

For some odd reason mine has one, it is a 1989 firebird formula, verified by vin. Did these cars come with drum rears, or disc only - which i believe is correct? If this is supposed to be a disc rear car, it would explain the bit of nose dive I have under hard braking. If some one has indeed done a cheap rear swap (probably because it had 3.73s) would it be fairly straight forward to swap back?

I have a perfect 1988 BW 9 bolt with 3.27 that I have all the hardware to, though i suspect the disc hardware (e-brake cables, etc.) were used on the drum rear i have now. Thanks for the help!

 

Check your RPO codes

 

The swap would be straightforward. You'd need a disc brake proportioning valve, the correct e-brake cables (disc brake cables wouldn't fit a drum rear), and drive and/or driven gears to make the speedo read correctly.

JamesC

 

RPO sheet is long gone, It is listed as a L98 car on the little sheet i found under the dash pad though, with all electric options, etc. It is also listed as a firebird FFM (firebird formula) on the title.

Does anyone know if the L98 cars were infact 4 wheel disc only?

 

The following link is interesting, if nothing else:

https://www.thirdgen.org/forums/hist...-350-drum.html

JamesC

 

Sounds like some one must have swapped the rear out then, will start looking for a disc rear to replace it.