Well I would say it depends on which one has the gear ratio you need and what it will cost to make the necessary changes. Changing your original rear end to 5 lug will require machine work. The '72 will require some cutting and welding. The '81 you got with the frame will require some cutting and welding also, but it will have the bigger brakes. Is the '81 rear end a 12 bolt or a 10 bolt? Do you know anyone that can help you with either the machining or the cutting and welding? Or are you capable yourself? Keep in mind that the welding needs to be done by a competent weldor since this requires good welds on a critical component.
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Originally Posted by 60apache
Thank you captainfab. I did go back and read the other post great info. so in your opinion what should I do? redrill my rear end thats in the truck, use this 80 rear end that I have, or get the 72?
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