I purchased a disc rearend for my car and got the proportioning valve and master cylinder to be safe. My car is a 89 and so was the car I got the parts from. Turns out, GM changed the thread pitch mid year and the valve I bought won't work. It was the first design where my car has the second design. Just thought I would let you guy's know in case you run into the same problem.

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89'Camaro Convertible,96'firebird wheels,79'Z28 hood scoop, 3.27 posi disc brake rearend,36mm front sway bar, 24mm rear bar, Poly sway bar bushings and end links, Dark yellow green paint from Bonnevilles, tan Mr. Mikes leather interior,Macewen white face gauges.
Dreaming of a RamJet 350,

Open element
Jet fan switch
180 degree thermostat

2nd place is always the first loser!

 

If you will "search" for this subject here on the third gen board. You will see that I along, with others. Have discussed this subject to death. The discussion was very informative though. I personally learned a lot.

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82Z 305 w/comp 270 magnum cam,Edelbrock Performer RPM,Holly 1850-4,serpentine belt drive.TH700R4 w/B&M holeshot 2000 converter,& megashifter.1LE front brakes, 9bolt 3.27 w/1LE rear brakes.Aluminum driveshaft,boxed rear susp.poly everything,IROC swaybar+wonderbar. 70mph@2200rpm ASE Master Tech plus L2
also recently obtained a
'69 chevelle SS396 w/Turbo 400,3.31 posi,11.0 to 1, headers,etc. Latest project car,'86 IROC stock 305TPI hit on left side,but not too bad

 

I did "search" the archives and did not see anything about the difference in the thread pitch on the 1989 proportioning valves. I was just trying to let people know about this difference. I wasn't trying to beat a dead horse. I saw alot about the proportioning valve differences, but nothing about the difference I am speaking of. I was just trying to be of help.

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89'Camaro Convertible,96'firebird wheels,79'Z28 hood scoop, 3.27 posi disc brake rearend,36mm front sway bar, 24mm rear bar, Poly sway bar bushings and end links, Dark yellow green paint from Bonnevilles, tan Mr. Mikes leather interior,Macewen white face gauges.
Dreaming of a RamJet 350,

Open element
Jet fan switch
180 degree thermostat

2nd place is always the first loser!

[This message has been edited by 89rsvert (edited July 17, 2001).]