73-87 Drop spindles on 71 C20

[sixtwo]

Okay, I know many variations of this question have been asked but they all seem to be for C10s or 5 lug conversions.

I have a 70 C20 running 71 C20, 8 lug disc brakes.

Can I run the 73-87 drop spindle and keep the 8 lug rotor, if the spindles say they're for 1.25" rotors?

[Warrens69GMC]

No because the rotors are 12" c10, and 13"c20

[BAD1916]

I don’t have any first hand knowledge of these but here are some that say for 71
https://www.summitracing.com/parts/wst-14273

[sixtwo]

Originally Posted by Warrens69GMC

No because the rotors are 12" c10, and 13"c20

So it sounds like the issue is in the caliper mounting location.

[sixtwo]

Originally Posted by BAD1916

I don’t have any first hand knowledge of these but here are some that say for 71
https://www.summitracing.com/parts/wst-14273

I believe that is the only company that makes them specifically for a C20. I just happened to have a person selling some and I wanted to see if they would fit but sounds like they won't.

[SCOTI]

You need a spindle intended for a 3/4 or 1-ton application if you want 8-lug stuff.

• There was a C20 spindle @ one point (through Early Classics) that simplified doing a C20 to C10 swap.

• The caliper retaining bolts dimensional footprint is different on a C20 vs C10.