History / OriginalityGot a question about 1982-1992 Camaro or Firebird history? Have a question about original parts, options, RPO codes, when something was available, or how to document your car? Those questions, answers, and much more!
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I've read that early in the 91 model year run GM had an issue with rear disks, can't remember what it was right now, they substituted rear disks with aluminum drums and offered a credit on cars ordered with a rear disk package.
I looked into this when I seen my TA has the R6P RPO which includes the J65 rear disk but also had the J42 aluminum rear drum RPO
Mine was made in 5/91 so it is a model made towards the end of the run. I've heard they only did this on the 91 models, not sure if it's true or not and not sure why they would do this either.
There was a shortage of the Disk brakes in 1991 for a period of time, not sure if it was from a Union strike or if there was some other issue... nonetheless some 1991 cars got Aluminum drums instead of the mandatory Disk brakes on the 350 cars...
Effective July 30, 1990 Cars that were previously mandated to have disk brakes came with Aluminum drums. The only exception to this was the G92/1LE cars. Prior to this Discs were Optional on the Trans Am with the LB9/M5 and Required on the Formula and GTA with the LB9/M5/ and Required on all the L98/A4 cars. They no longer accepted orders as of July 16, 1990.
they were replaced with the J41/J42 rear Drums,
Effective May 28, 1991 4 Wheel disc Brakes returned, Orders could be made as early as May 7, 1991.'
So from July 30, 1990 thru May 28 1991 there were no Disc brake cars EXCEPT the 1LE cars... Might include the B4C cars tho, not sure.
John
__________________ 87 FORMULA - 5.1 LB9/A4 T-tops 3.73 Modified (Yellow/Black)
87 FORMULA - 5.0 LB9/M5 T-tops 3.45 (Yellow/Gray)
89 FORMULA 350 - CONVERTIBLE 3.27 All original (Red/Gray) www.3rdgenformula.com
methinks some previous owner swapped something. Either not a legit formula, or it was built with the LO3, or the rear axle was swapped. If GM built it this way, I'd be surprised.
methinks some previous owner swapped something. Either not a legit formula, or it was built with the LO3, or the rear axle was swapped. If GM built it this way, I'd be surprised.
Read my previous post, it explains the whole thing...
There was a shortage of the Disk brakes in 1991 for a period of time, not sure if it was from a Union strike or if there was some other issue... nonetheless some 1991 cars got Aluminum drums instead of the mandatory Disk brakes on the 350 cars...
Effective July 30, 1990 Cars that were previously mandated to have disk brakes came with Aluminum drums. The only exception to this was the G92/1LE cars. Prior to this Discs were Optional on the Trans Am with the LB9/M5 and Required on the Formula and GTA with the LB9/M5/ and Required on all the L98/A4 cars. They no longer accepted orders as of July 16, 1990.
they were replaced with the J41/J42 rear Drums,
Effective May 28, 1991 4 Wheel disc Brakes returned, Orders could be made as early as May 7, 1991.'
So from July 30, 1990 thru May 28 1991 there were no Disc brake cars EXCEPT the 1LE cars... Might include the B4C cars tho, not sure.
John
That's what I remember the dealer told me back then also.
