4900341 | Richmond Gear | GM 8.5 | Gear Set Ratio 3.90

GM Ring & Pinion Gear Set

• Ratio: 3.90
• Teeth: 39-10

  GM 8.5"

  • Fits 2.73 and Higher Carrier
  • Pinion Diameter: 1.626"
  • 30 Spline

     

     
  • Front: Use Installation Kit #836-83-1020-1
  • Rear: Use Installation Kit #836-83-1021-1
  • 1973-87 Truck: Use Installation Kit #836-83-1021-M or #836-83-1021-TE
  • Does not work with pinion-mounted ABS sensor in 1990-96 Impala/Impala SS/Caprice
  • When replacing a stock 2.56 or lower ratio, the carrier must be replaced with a 2.73 or higher carrier

   

  Specifications:

  Axle Type

  GM 8.5 in.

  Cover Bolt Quantity

  10

  Pinion Gear Tooth Quantity

  10

  Pinion Spline Count

  30

  Ring Gear Bolt Quantity

  10

  Ring Gear Diameter

  8.5

  Ring Gear Material

  8620 Steel

  Ring Gear Tooth Quantity

  39

  Ring Gear Rotation

  Standard

  Pinion Shaft Diameter

  1.626 in (41.3 mm)

  Quantity

  Sold as a set

  Ring Gear Bolts

  10

  Pinion Gear Teeth

  10

  Ring Gear Teeth

  39

  Installation Kit Included

  No

  Ring and Pinion Ratio

  3.90:1

  Differential Carrier Break

  2.76 and Higher

  Cover Bolts

  10

  Carrier Series

  3

  Manufacturer's Part Number:

  49-0034-1

  Shipping Weight:

  17.54

  Package Height:

  15.1

  Package Depth:

  5.3

  Package Width:

  11