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Author Topic:   Big GM roters and spindles
mo6racing
Dirt Roller

Total posts: 22
posted March 01, 2005 05:23 PM  
When using the big GM spindles (casting # 371676) there are differant outer wheel bearings. Has anyone figured out how to mix the two differant roters and spindles, or do you have to keep them together?

udecide66
Dirt Freak

Total posts: 229
posted March 02, 2005 10:18 AM  
I know when using the big GM spindles you have to use the rotors that came on the spindles, there is 2 sizes of rotors (11" & 12") make sure the spindle you use has the 11" rotor (lighter weight)
I would bet you can interchange any of the spindles and rotors if you had the correct bearings and they were in the same location. I would try a industrial bearing supply store to get the correct bearings, you will need to take both spindle and rotor to them so they can measure the race and shaft.
I would suggest using something common and easy to find so when it comes to rebuild time the parts are easy to replace.

JDTURNLEFT
Dirt Full Roller

Total posts: 36
posted March 02, 2005 12:47 PM  
I have found that the outer bearing differance is because of the years and you can find that sum have same casting numbers but they are machined both ways, 77-78 outer bearing has the smaller ID outer (same as thread diameter) 80 up has larger and on the spindle the bearing surface steps up from the threads. 79 I am not sure you would have to look. I have heard of guys using the smaller spindles putting spacers between spindle and bearing to make up the differance.

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