O.K. i have a borg-werner 327 posi but dont have rear disk brakes,i found a rearend with the disk brakes for $150.00.It's out of an '88 GTA but how hard is it going to be to put these on my rearend,is it worth the $150. just for the brakes? Now if this rearend has 373 gears then what is the best way to check it for damage.I may swap the entire thing.anybody?

------------------

 

you cant just swap over the brakes, you have to swap the entire axle, you will also need its brake booster, master cylinder, parking brake cables and proportioning valve, i did it on my 80' and its a MAJOR pain in the a$$ to swap everything over but im happy with the improved braking.

 

Actually, he may not need to swap m/c's. Apeiron (I think) dug up an old service bulletin of GM's. It seems that some F-body owners (with rear discs, 82-88) complained that their brake pedals were too hard to push. (Aww, poor little things!) GM said that the dealer could pull the 4-wheel-disc master cylinder (RPO J65), and install a disc/drum master cylinder (J50). They said the J65 m/c was produced specially to give the driver increased pedal feel.

So right from GM's mouth, there will be no troubles using a disc/drum master cylinder on a 4-wheel-disk car. But I'd still get the correct prop valve! GM still sells them "new" for about $80.

One more "trick": 82-88 rear discs were recalled.. the parking brakes stopped working. GM sells the service bulletin parts. Search the suspension/chassis board for more info!


------------------
-Tom P (Hot rodded 1986 Firebird 2.8l)

 

If you want disc brakes i would look into getting a 91-92 setup. I am in the process of fitting the late model setup to my 89 axle.

 

yea i just did that swap with a bwd 9 bolt 3.08 posi setup.... works great but i have no e-brake.... lol... but after i did it i broke the tranny... .... so i didnt get to drive it much... but i have a soft pedal feel but stops on a dime..... hehe.... its alot better than drums

------------------
305, TPI,compucam 2030 cam, air foil, 8.8 wires, accel super coil, dynomax headers, custom y-pipe, cut out, 80 series flowmaster, just installed my 3.08 posi disc brake setup...(3.42-3.73 on the way). and a stage 4 chip :0). hittin a sad 15.1 after the chip with 2.73 open diff....

 

also the preportining valve its like 48 bucks from autoparts.com.... and the part number is acdelco number 175-2005 or 172-2005 cant remember off the top of my head

------------------
305, TPI,compucam 2030 cam, air foil, 8.8 wires, accel super coil, dynomax headers, custom y-pipe, cut out, 80 series flowmaster, just installed my 3.08 posi disc brake setup...(3.42-3.73 on the way). and a stage 4 chip :0). hittin a sad 15.1 after the chip with 2.73 open diff....

 

thanks for your responce,dosn't seem like it would be to much trouble,i would be getting the axles with the rearend so that leaves the preportioning valve,and the finding the emerg.brake cables,,Sounds like a good winter project.

 

Is the other rear a 10 bolt or a 9 bolt? the axles will not interchange between the 2. What calipers are on teh disc rear end? if the rears are different then you will need the correct backing plates. You do not have to switch the axles just the backing plates. the backing plates are not interchangeable and the pbr caliper and 11.65 rear rotor came out in 89.

------------------
86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.