Product Summary

GM 7.5 Inch 10-Bolt, 4.640" Inside Diameter, Painted

  • Specs: 7.50? dia. ring gear; 1.438? dia. pinion 27-spline
  • Note: When using a carrier from an original 3.23 or numerically lower, you need to use the ring gear spacer 91048305
  • All GM models except H body Monza, Vega and Starfire ?77-?99
  • Camaro, Firebird ?82-?99
  • S-10, S-15, Astro Van ?83-?99

Key Specs

MFG. Part #91048305
BrandSpeedway Motors

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Speedway Motors 91048305 Details

Allows you to install a bigger series gear set onto a smaller series carrier. Precision ground to ensure trueness and provide proper backlash. Fits 7.50" diameter ring gear with 1.438" diameter pinion (27 spline). Longer, LH thread ring gear bolts are included with this spacer.

Item Details

'''82-''99 Camaro/Firebird
''83-''99 S-10/Astro Van'


  • '77-'79 GM Models (Except H-Body Monza, Vega and Starfire)
  • '82-'99 Camaro/Firebird
  • '83-'99 S-10, S-15, Astro Van


  • GM 7.5" case series:
    • 3.08 & Numerically lower fit "2 series" carrier
    • 3.23 & Numerically higher fit "3 series" carrier

Speedway Motors 91048305 Specifications

MFG. Part #91048305
BrandSpeedway Motors
Inside Diameter4.640"
Outside Diameter6.600"
Overall Thickness.315"
Material TypeSteel
Hardware IncludedYes
Sold in QuantityEach
NotesRing gear bolts are included. 91048304 (7/16-20 x 1.25" left hand grade 8 hex head 10 pc)