Big End Performance 30021 GM 8.5 in. Ring and Pinion Set 4.56:1 Ratio

$142.79
MSRP: $178.49
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SKU:
BEP30021
MPN:
30021
Condition:
New
Weight:
12.00 LBS
Shipping:
Calculated at Checkout

Applies To Continental U.S. orders only

Out of stock

Designed for street, moderate strip and circle track applications. Forged steel heat-treated for added strength. Machined to the tightest tolerances


ADDITIONAL PARTS NEEDED:
30100 Installation Kit, GM 10 Bolt, 8.5 in. Gear, 73-97
31020 Mini Spool, 28 Spline

BREAK IN PROCEDURE: Drive vehicle NORMALLY for twenty minutes and let the gear cool down. Than drive vehicle NORMALLY again for another twenty minutes and let the gear cool down. The break in period is very important for lapping the load and coast pattern of the gear mesh. This break-in procedure prevents gear noise, stress points to develop when the gear is properly set up to manufacturer's specifications. Periodically check the oil level to make sure the case is full of clean gear lubricant and the oil stays relatively cool to touch by cover or housing inspection for MAXIMUM Gear life. Either Mineral Hypoid gear oil or Synthetic gear lubricants are recommended.

Not lubricant sensitive.


Features
  • GM 8.5 in. Ring & Pinion Gear Set
  • 41-9 ring gear-pinion tooth count
  • All 70-81 GM cars, All 77-02 GM trucks
  • 11 in. and 10 5/8 irregular 10-bolts rear covers
  • 8.50 in. diameter ring gear
  • 1.625 in. pinion diameter, 30 spline
  • Differential Case Design Type:
    GM 8.5 in. (10-bolt)
    Ring and Pinion Ratio:
    4.56:1
    Ring Gear Bolts:
    10
    Pinion Spline Count:
    30
    Ring Gear Rotation:
    Standard
    Ring Gear Teeth:
    41
    Pinion Gear Teeth:
    9
    Ring Gear Diameter (in.):
    8.500 in.
    Pinion Shaft Diameter (in.):
    1.625 in.
    Installation Kit Included:
    No
    Cover Bolts:
    10
    Quantity:
    Sold as a set.
    Axle Model:
    GM 8.5 in. (10-bolt)