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Tech Question
Mike Follis, Bevidere, IL, 1966 Plymouth Belvedere II 383
I am rebuilding a Plymouth Belvidere II, putting in a 383 not sure if I will install 727 Auto. or 4-Speed, The car was originaly a 225 six with 904 Trans.
I would like to install a posi trac. rear end, maybe a Dana 60, the problem is I am not sure what is the best way to go, I have redone the front end, bushings, struts & bigger torsion bars.
Hope you will share your experience and give me some Ideas on a good rear end, and if I have to swap out housing or use the one I have now for upgrade.
Mike: I'm curious as to why you changed the struts? The only way I've ever seen 'em go "bad" is by being bent by tow hooks!
OK, anyway, if you're gonna be a Mopar guy, you'll need to wash that Chebby terminology out of your mouth and brain. Repeat after me: "Sure Grip differential. Sure Grip diff....".
The Dana 60 is a Salisbury-type differential, i.e., no drop-out senter carrier section. The casting is permanently welded to the axle tubes. So, if that's what you've gotta have, it'll require a complete new axle assembly. But your current 8.75" is plenty strong enough for anything a 383 can throw at it. The axles are super strong, the tapered roller wheel bearings are as good as it gets, etc. Just pick up a Sure Grip-equipped center section, in any ratio you want, and pop it in, adjust the wheel bearing endplay (shoot for 0.005") and you're good to go. Try to get one with a casting number that ends in 742 or 489, those were the strongest.
Rick
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