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Since 1952

1970-76 GM 10-Bolt Mini Spool

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1970-76 GM 10-Bolt Mini Spool

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What's in the Box

Works on 70-76 GM 10-bolt rearends with 8.5" ring gear and 28-spline axles. Economical way for all race cars to "lock" the rearend. Will not work in posi rearends.

910-48601 Instructions (PDF)

Item Details

8.5" ring gear, 28 spline

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Kit Includes:

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  • pinion seal
  • thread locking compound
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Note: Pinion-depth shims are not included. 

Item Details

30 Spline Pinion
GM 8.5 Inch 10-Bolt Steel Full Spool, 28-Spline
(Part #91048528)
                        This  is a steel full spool made from 4130 aircraft alloy heat treated steel.
Lubrication Engineers SAE 90 Weight Gear Oil, 1 Gallon
(Part #91044090)
                        Whether you're running a stock flattie and rearend or hopped-up overhead and quick change, you need to run a good gear lube. Remember that your rearend was designed fifty plus years ago and needs all the help it can get. 

The biggest improvement you can give it is a lubricant that will allow the gears to survive the highway speeds that cars see today. L.E. gear oil is what we use in our 350 mph streamliner, that uses a V-8 quick change, without failure. The "red stuff" provides superior lubrication for long gear life. You can't win if you don't finish. We suggest 90 weight for the street and 140 weight for extreme uses.

  • Formulated using blends of high quality paraffinic and synthetic base fluids
  • Contains a highly shear stable tackiness
  • Unique blend of base fluids and thermally stable EP additives
  • Separates readily from water
  • Contains non-silicone defoaming additives
  • Contains no solids
  • Contains DUOLEC LE's proprietary dual acting liquid wear-reducing and extreme pressure additive
LE Gear Oil Performance Data Sheet (PDF)

LE Gear Oil Safety Data Sheet  (PDF)

Rear Axle Breather, AN4 Bulkhead
(Part #91045845)

The pleated high efficiency breather comes with an AN4 bulkhead fitting and nut. AN4 fitting is 7/16 x 20 thread. Filter has hose clamp to tighten lower rubber flange to bulkhead fitting. Rubber lipped base of filter accepts 1/2" fitting and can be adapted to a 1/4" pipe nipple if desired. Can be used on various applications with appropriate plumbing components.

Filter is available separately under part number 465-621330.