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Click on image for the lowdown. 
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| | | Forums66 Topics128,161 Posts1,056,956 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Aug 2011 Posts: 4 New Guy | | New Guy Joined: Aug 2011 Posts: 4 | I would use GL4 which is somewhat hard to find. Most everything now commonly found is GL5 which is good for the rear end. This is what I use in a SM420 http://www.summitracing.com/parts/RED-50304/
Last edited by CAC; 11/25/2011 7:35 AM.
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