i have an 1984 Z28 with the LG4/auto combo. out back is the original 10 bolt drum brake rear with peg leg 3.23s. i just aquired a 88' GTA parts car with the 9 bolt disc brake rear (3.27 posi). i want to swap the posi rear from the GTA into my Z28. my main concern is if the brake lines from the drum rear will bolt up to the disc rear... or would i have to swap the drums onto the new diff to make everything line up? what other kinds of problems am i going to run into? thanks in advance

 

its a very easy swap i did it on my 89 but i you might have to do a little more in your case

if you look on your rear bow you have steal brake lines coming from your wheel cylinders going to distributer block that is bolted right on the main housing all you have to do is first unbolt the brake lined from it and then unbolt it from the ousing and take the rear out.

then just do the same thing in reverse with the new rear

but in my car it already had the newerstyle perportioning valve so i did not have to swap that. all you need to do is take the one out of the gta and swap it with the old one
all the lines sould match up but im not sure