wtb a sure grip
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There was waaaaaaaay more 8 3/4's behind BB than Dana's.
Who is "they". Mopar sold Hemi cars with automatics and 8 3/4's I'm not argueing that a 8 3/4 is stronger than a dana 60, just capable. I ran 6.04 in 1/8 for several seasons with a 8 3/4.
I'm sorry to the OP. I took this off track. I'll shut up.
trapster
Well-Known Member
Mr. Riv,
Since he asked about what would handle a stroked big block I think you are still on subject.
And since you clearly have more information than I do I will bow to your superior knowledge.
So is there is difference in limited slip units or is the weak link in the pinion size.
Since he asked about what would handle a stroked big block I think you are still on subject.
And since you clearly have more information than I do I will bow to your superior knowledge.
So is there is difference in limited slip units or is the weak link in the pinion size.
1wild&crazyguy
Banned
He has an 8 3/4 , so stfu about Dana 60's and quit mucking up his post.
Thank you.
Thank you.
trapster
Well-Known Member
That is very nice, the original post was about what would handle a stroked big block. No need to get mean.
Dartnut
Don't hate me because i'm beautiful
I would consult a professional that specializes in this, like Dr. Diff for instance.
You would be better off in the long run.
Just my 2 bits worth.
Tom.
To me pinion size is the most important. Therefore if you choose an 8 3/4 best choice is a #742 case. Second best choice in an 8 3/4 would be the #489 case. The Dana 60 is stronger, but typically much more pricey. Mopar installed these in hipo big block and Hemi 4 spd cars only because of the shock loads in dumping the clutch at a high RPM from a standing start. All others got an 8 3/4 as mentioned above in other postings. The best Posi units are the clutch type, manufactured by Dana and used until 1969 approx. After that Mopar switched to a cone type built by Borg-Warner. While horsepower is always a factor in parts longevity, driving style/use matters more. Either type rear/posi will live well behind an automatic, generally speaking, because a typical converter allows slip which decreases the shock load to the driveline on a typical launch from a starting line or traffic light. I raced a small pinion #741 case 8 3/4 (considered by many to be to weak for heavy abuse) behind a max wedge style built 440 (12.50 ET street trim/11.60's on slicks) for many seasons without any issues.
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