Re: 8 3/4 Rear End change - 742 vs. 489?
[Re: moparsenior]
#1003021
05/30/11 03:58 PM
05/30/11 03:58 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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The 742 is the preferred case, it has the largest pinion bearing.
The INTERNET, the MISinformation superhighway
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Re: 8 3/4 Rear End change - 742 vs. 489?
[Re: wvmarv]
#1003023
05/30/11 07:36 PM
05/30/11 07:36 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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This has been talked to death, the 489 might have a larger pinion stem but it necks down to the same size as the others at the yoke. The smaller rear pinion bearing of the 489 makes the pinion more likely to deflect under load.
Note that the factory chose the 742 platform to make their aftermarket aluminum housing.
The Hemmings article claims the 489 is the most sought after.....I would ask "by who"?
The INTERNET, the MISinformation superhighway
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Re: 8 3/4 Rear End change - 742 vs. 489?
[Re: wvmarv]
#1003028
05/31/11 10:07 AM
05/31/11 10:07 AM
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Joined: Jan 2003
Posts: 74,905 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,905
U.S.S.A.
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Quote:
Quote:
The 742 is the preferred case, it has the largest pinion bearing.
wrong, the 489 case has the largest diameter pinion shaft at 1 7/8" and is the most sought after. see this link. http://www.hemmings.com/mus/stories/2004/10/01/hmn_feature21.html
Guess again , as delivered the 742 is by far the stronger of the 2, the biggest problems with the 489 is that POS crush sleeve and the POS cone type sure , even when switching out the to a solid spacer and a clutch type sure grip the 742 still gets the nod with it's dana 60 like inner pinion bearing . johnscudashop , what is the suregrip in your picture an Auburn ? It's a bigger POS than the original borg warner cone unit ...
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Re: 8 3/4 Rear End change - 742 vs. 489?
[Re: MoparforLife]
#1003031
05/31/11 06:07 PM
05/31/11 06:07 PM
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Joined: May 2008
Posts: 293 CA
David Lee
enthusiast
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enthusiast
Joined: May 2008
Posts: 293
CA
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Unless you plan on putting some real serious HP on them anyof the pumpkins will work fine on a street car. I rin 5.38 with a spool on my stocker and have no problem what so ever
Ah...so many pedestrians, so little time...
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