I have a 91 GTA that has rear drum brakes on it and I an converting to rear disc by swapping the rear end for a differant one. And I am putting on the 1LE setup in the front. Am I going to have to change the master cylinder and pro. valves. IF so can someone help me with the part number. Thanks

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1991 Trans Am GTA, Accel 300+ ignition, underdrive pulleys, AFPR, Accel SuperRam (ported out), Edelbrock lower intake (ported out), BBK 58mm TB, TFS 23* heads, SLP 1 3/4 headers, SLP 3" cat back (no cat), CompCam .495/.502 lift, Kenny Bell strut tower brace, lower frame brace, Jeg's SFC, Lakewood trailing arms and panhard rod

Pony's can run, but bird can fly

1987 Buick Turbo-T
1977 Chevy Blazer 4X4

 

Check this site out AndyZ28 and I are making.
http://www.geocities.com/rgades/1LE.html?985236018930

 

You will need GM part# 10136840 proportioning valve. You will use your existing master cylinder.

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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

 

Thanks for the info. What kind of diferance will I notice after doing this? It kind of sucks right now. I have to push hard to stop the car and keep it stoped not to mention when your doing 100mph.

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1991 Trans Am GTA, Accel 300+ ignition, underdrive pulleys, AFPR, Accel SuperRam (ported out), Edelbrock lower intake (ported out), BBK 58mm TB, TFS 23* heads, SLP 1 3/4 headers, SLP 3" cat back (no cat), CompCam .495/.502 lift, Kenny Bell strut tower brace, lower frame brace, Jeg's SFC, Lakewood trailing arms and panhard rod

Pony's can run, but bird can fly

1987 Buick Turbo-T
1977 Chevy Blazer 4X4

 

You will be amazed at the difference. But you should install the 1LE rear discs also. That way you will have 12" rotors on all 4 wheels.