8 3/4 mopar rear Q

Tom keedle · 05-07-2009, 03:52 AM

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

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

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

treessavoy · 05-07-2009, 10:38 AM

Quote:

Originally Posted by tomslik

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

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

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

I wonder where they are made??

Glenn Hayes · 05-07-2009, 07:58 PM

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

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

05-07-2009, 03:52 AM	#1
Tom keedle Senior Member Join Date: Dec 2008 Location: Berthoud, Coloraduh Posts: 695 Likes: 13 Liked 8 Times in 7 Posts	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

05-07-2009, 05:56 AM	#2
Chuck Beach Senior Member Join Date: Jun 2006 Location: Delaware, Ohio Posts: 664 Likes: 12 Liked 58 Times in 13 Posts	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. __________________ Chuck Beach 3340 STK

05-07-2009, 07:16 AM	#3
herbjr VIP Member Join Date: Apr 2005 Location: Greensboro NC Posts: 1,027 Likes: 1 Liked 83 Times in 32 Posts	Re: 8 3/4 mopar rear Q Why spend the money to design a new case and not but billet caps on it.

05-07-2009, 06:09 PM	#5
Philip Saran Senior Member Join Date: Oct 2006 Location: Parker, CO. Posts: 728 Likes: 163 Liked 14 Times in 11 Posts	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. __________________ Phil Saran Parker, Colorado

05-07-2009, 07:39 PM	#6
Chris DeGidio Member Join Date: Jun 2007 Posts: 364 Likes: 8 Liked 2 Times in 2 Posts	Re: 8 3/4 mopar rear Q I wonder where they are made?? __________________ Nautilus Racing

05-07-2009, 07:58 PM	#7
Glenn Hayes Member Join Date: Feb 2009 Location: Weeki Wachee, Florida Posts: 348 Likes: 416 Liked 18 Times in 12 Posts	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.

05-08-2009, 01:01 AM	#8
Phillip marvetz Senior Member Join Date: Oct 2008 Location: Lynden ,WA Posts: 820 Likes: 0 Liked 3 Times in 3 Posts	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.