4.09 Gear

[NipSC4328]

The difference in the rate of expansion between aluminum and iron may be the reason, could effect the ring to pinion spacing.

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[Darkane]

The difference in the rate of expansion between aluminum and iron may be the reason, could effect the ring to pinion spacing.

Strictly a strength concern on the rear tie points. (Source: CJponyparts video)

We CAN do an aluminum housing by buying the auto diff housing and stuffing 4.09s in it. It'll be $$$ all said and done. Might be worth looking into

I read an article from the '96 F-150 going to an aluminum diff housing and saving 22lbs. 40 to 18.

The IRS pumpkin being larger would save the same or more weight.