Disc brake swap

[RayHardesty187]

Quick question, I have a 1998 z71 drum brakes in the rear. I was wondering if a 1999 4 wheel drive half ton s rearend will bolt right up.? Looks the same. I didnt kno about the whole drum to disc

 

[454cid]

I believe the spring perch width on the GMT-800s is different... possibly shock mounts too.

 

[RayHardesty187]

I believe the spring perch width on the GMT-800s is different... possibly shock mounts too.

How would I go about measuring that? Cause the truck is in the junk yard so I cant get a side by side comparison

 

[454cid]

How would I go about measuring that? Cause the truck is in the junk yard so I cant get a side by side comparison

Very carefully? I'm not sure how to get a good meaningful measurement since the pumpkin is in the way, especially in a salvage yard. It's pretty well always stated that they're different and mounts need to be moved, so I wouln't concern myself with verifying that. The thing would be to accurately measure things when welding new ones on. I have never done this. I still have drums, and plenty of other things that need attention first.

 

[skylark]

The 800 axle is wider as well.

 

[RayHardesty187]

Well I figured it wouldnt work thatd be too easy. Lol Thank guys

 

[Chris Barnhart]

Shock mounts are close enough to the same that they work, but the spring pads have to be moved. I found out the hard way and though I have a built 10 bolt with disc brakes in my truck now... I have waaaayyyyy more money into a 10 bolt than its worth. Shoulda followed my instinct and swapped in a 14 bolt.