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10 Bolt 8.5” Street Gears
 
 
Category: Ring & Pinion Sets
Part Number(s): GM 10 Bolt, 8.5”, 8620, 3 Series
 
Fits all 3 series carriers (original ratio of 2.73 and numerically higher), 8.5” ring gear diameter, 1.625” diameter pinion, 30 spline, 8620 alloy. Primarily for street, oval track, and lightweight drag racing applications.
$>$150.22 - $247.43.

Items marked with an asterisk (*) are available with limited stock
 
 
 
 
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8.5" 10 Bolt Ring Gear Spacer
Part Number(s):  58980
 
Used to install Gears on a carrier that originally had a 2.56 or numerically lower ratio.
 
Price: $92.98
 
 
 
 
 
GM 8.5" 10 Bolt Installation Kit
Part Number(s):  83-1021
 
Installation kit contains all the parts required for a complete ring and pinion installation
 
Price: $131.70
 
 
 
 
 
GM 8.5" 10 Bolt Installation Kit w/MW Spool
Part Number(s):  83-1021-S
 
Installation kit contains all the parts required for a complete ring and pinion installation, including spool
 
Price: $185.82
 
 
 
 
 
Special GM 10 bolt Cross-Pin
Part Number(s):  80-0272
 
Used with GM 8.5" 10 Bolt Carriers/Posi Units with Ratios of 5.38 or Numerically Higher
 
Price: $39.38