1987 GMC V1500 Sierra Classic LS swap/build

[NastyBuzzard]

So I started on the brake swap.



First thing is that the caliper was too close was riding the rotor. The rotor wouldn't seat on the hub all the way.





Another thing to note. If you buy oem or AC-Delco rotors like I did, the M14 wheel studs wont fit through them. They are designed for M12 studs. I had to drill out my rotors. Also on the rotors there is a bevel on the inside of the hat to allow the chamfered end of the wheel stud to go in to. That was also too small so I had to open it up to allow the rotor to seat all the way.

Once I did that, it was fine.



But still not a lot of clearance.



So now that fits, lets try wheels.



Wheels kept hitting the caliper. Ok, I remembered he needed a 1/4" spacer to allow his wheels not to hit.

So I stacked on 1/4" of washers, thinking my wheel was the same exact specs as his.

Ended up needing at least 3/4" of washers to space wheel out which left me barely no studs to attach my wheel. ****.





It turns out his cragar 17x8 have 4.5" backspacing with 0 offset. While my vision wheels that are 17x8 have 4" backspacing with -12 offset. So the spoke of the wheel is rubbing the caliper.

I was ok with a 1/4" shim but I am bummed I will have to use a 1" spacer to be able to bolt my wheels on.

I am currently trying to find some wheels that will fit but no luck at all. I basically need a wheel that will fit a H3 hummer but with 4" of backspacing.

ALSO the drill size to make the 14x1.5 studs go in the 87 hub isn't 39/64 like he said. He said when he used that size they didn't fit tight and he had to use loctite. The perfect drill bit size is 19/32. They go in just like they should!

Another thing to note is that the face of the caliper sticks out about 7/8" from the face of the rotor. So rim selection here is very important!