Rear disc brake conversion question

[JoeGrapes]

I'd like to convert my rear drums to disc. I have an 8 3/4 axle from a 1974 Barracuda and when I search for kits they list e-body kits up 1972. Is there any reason why it won't fit my 1974 axle?

[wiging19]

 

[brads70]

I'm no expert but I can't see why they stop at 1972? They are all the same as far as I know?
Did you look into the kits from DrDiff? ( Cass) That's where I got mine from. Works great and installed easy.

[JoeGrapes]

Thanks Brad, I'll check them out.

[Chryco Psycho]

the 8 3/4" diff was dropped in virtually all applications in 72 , only the E body continued to 74 so that may be the reason for the cutoff as 72 , either way the flange is the same , it is a simple 5 bolt flange , unbolt the 5 bolt flange slide out the axle , , disconnect the brake line & remove the brake backing plate , the disc system will bolt onto the same flange .

[JoeGrapes]

You are right Chryco, the companies I looked at that list a part number, list the same number for all the years. I didn't know Mopar stopped using the 8 3/4 axle for all their cars except the e-body after 1972. Thanks for the info.

[Chryco Psycho]

 

[johannes]

Does this kit come with new master cylinder ?....or do you just modify existing ?

[JoeGrapes]

none of the kits I looked at come with a new master cylinder but since I have disc brakes in the front now I'm thinking I don't need one.

[Chryco Psycho]

if you are adding rear disc there is a residual pressure valve behind the brass insert the flared line seals against in the master , you can use a threaded screw like a drywall screw to grab the insert & pull it out , remove the rubber RPV & insert the brass insert again ,