Help indentifying G/N rearend

[84GP455]

So let me get this right before i go spending a lot of money for this swap. 1) I need a proportioning valve from a 4 wheel disc car. Where do i hook this up? Near the master cylinder like most cars where all 4 lines will go into it? 2) I also need a master cylinder for a 4 wheel disc car? Maybe a Firebird of the same era, say like a 87-88? Will this master cylinder bolt up to my brake booster? 3) I need to have my current drive shaft shortened or get one from a Grand National or other Gbody with a 8.5 rearend? Is there anything else that i am overlooking or forgetting? If anybody can help me with these questions i would greatly appreciate it :wink:

 

[Bonnewagon]

The difference is that the 4 wheel disc MC's don't have residual pressure valves, like drum brakes use. I know a 79'-81' TA 4 wheel disc master will fit, as I used one in my 81' Malibu. If you prefer the G-body equivilant, a later TA with the plastic reservoir will look correct, but I can't swear by the fit. "MOST" GM will interchange, unless someone knows differently. I looked on RockAuto and the prices ranged from $20 for a Cardone rebuilt to $175 for a new GM, for an 86' TA. As for proportioning valves, I don't know what the difference is, but the few parts places I found listed different #'s for disc and drum. Last time I looked they went for $60-$100 for a new brass one, which won't rust out like the iron originals. The frame location on a G-body is hell on them, F-bodies hung it under the MC.

 

[79loserbluebu]

I think I know what he's talking about the with the F-body prop valve hanging under the MC. It's basically held there by the lines attached to the MC and prop valve. I would think it'd be as simple as getting the lines and prop valve from the F-body, bolting them to the MC, then cut the stock lines, drop the fitting, and flare it so it matches up with the prop valve

 

[84GP455]

Great! thanks for the replies and the help guys, I have an idea as to what to do now. I will let you know when i start the swap in a few months or so.

 

[Bonnewagon]

Actually there is a bracket that bolts to the two lower booster bolts. It in turn holds up the prop valve, you wouldn't want the brake lines taking the stress.

 

[79loserbluebu]

Ahh okay I understand. Yeah that wouldn't probably be the best idea