I want to put a 10 bolt disc brake rear end in my 86z(has 4.10),but want to keep rear drums(I do have all of the parts for disk). Do drum backing plates match up to disc rear end? I am not sure if axles are same length.

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84zgt4
86z,87
92rs
95z

 

no. disk and drum backing plates are different. They don't even use the same bolt pattern attaching to the housing. Axles will be the same.

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley