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Re: Factory posi install
If you can drop in both the ring and pinion from the posi unit, your chances would be better. No guarantee it will work but it should be close and easy to dial in by checking pattern on gear teeth.
As far as using your 70 pinion with the 67 ring gear this is not recommended as the ring and pinion wear in to each other over time.
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1970 Short Wide
5.3 4L60E BlackBear tune
3:73 gears, Boyd's Tank
2.5 / 4 drop 5 lug disc brakes
Vintage Air
18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear
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