CLASS RACER FORUM - 8 3/4 mopar rear Q

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Tom keedle

05-07-2009 03:52 AM

8 3/4 mopar rear Q

http://cgi.ebay.com/ebaymotors/NEW-H...1%7C240%3A1318

are these legal in stock? (nhra, i guess i'd better be specific)

and if a guy is hunting anyway, is a 489 case prefered over a 742?
i've got a 741 but ther ain't much for gear selection;)

Chuck Beach

05-07-2009 05:56 AM

Re: 8 3/4 mopar rear Q

Yes these are legal, I prefer the 742 over the 489, some racers have broken the caps on the 489.

herbjr

05-07-2009 07:16 AM

Re: 8 3/4 mopar rear Q

Why spend the money to design a new case and not but billet caps on it.

treessavoy

05-07-2009 10:38 AM

Re: 8 3/4 mopar rear Q

Quote:

Originally Posted by tomslik (Post 119292)

The 741 is not a good choice, they're weak, spider gears break easily, lack of gear selection and the pinion shaft is smaller.

Philip Saran

05-07-2009 06:09 PM

Re: 8 3/4 mopar rear Q

If you are going that route $172 is a good price, Dr Diff in Montana gets
about $250 for the same empty diff.

Chris DeGidio

05-07-2009 07:39 PM

Re: 8 3/4 mopar rear Q

I wonder where they are made??

Glenn Hayes

05-07-2009 07:58 PM

Re: 8 3/4 mopar rear Q

I researched the 8 3/4" Posi Units that are now on the market through EBay and other differential outlets, and found that they are manufactured in India.

Phillip marvetz

05-08-2009 01:01 AM

Re: 8 3/4 mopar rear Q

Randys ring and pinion has been selling them for years, if you get one use a solid shim instead of the crush sleave.

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