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Re: 489 or 742 posi unit for street and strip
[Re: Neil]
#843945
11/01/10 10:55 PM
11/01/10 10:55 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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489 is most likely an auburn style (cone), the 742 an eaton posi style (clutch)....I haven't had a cone style last longer than about 10k miles before it went open....
if buying new, I'd get one of the eaton torsen style, unless you're using a very high torque motor and verrry sticky tires (aka slicks) and your suspension hooks.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 489 or 742 posi unit for street and strip
[Re: RobX4406]
#843948
11/02/10 09:54 AM
11/02/10 09:54 AM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
Quote:
Quote:
The 742 is the better of the two versions.
 And a lot easier to set up 
Gus 
Use a crush sleeve eliminator and the 489's are just as easy.
But it will still have the POS sure grip
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Re: 489 or 742 posi unit for street and strip
[Re: JohnRR]
#843949
11/02/10 10:33 AM
11/02/10 10:33 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Quote:
Quote:
Quote:
The 742 is the better of the two versions.
And a lot easier to set up
Gus
Use a crush sleeve eliminator and the 489's are just as easy.
But it will still have the POS sure grip
Not necessarily. As you know the sure grips are interchangeable between all cases and a lot have been changed over or it can be easily changed over.
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Re: 489 or 742 posi unit for street and strip
[Re: Paul_Fancsali]
#843951
11/02/10 12:34 PM
11/02/10 12:34 PM
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Joined: Oct 2006
Posts: 3,054
USA
b54406barrel
master
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master
Joined: Oct 2006
Posts: 3,054
USA
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Quote:
Back in the 60-70s Mopar mechanic's use to say the 742 clutch sure grip was junk and the cone lasted forever !Well 45 years later I'm finding they don't last forever but frankly after that long who cares? I'm using cone one that on its way but when it goes for good I'll replace it.
Good to know I've got 5 years left!  I've been beating the crud out of the 6bbl car 489 for 40 years.
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Re: 489 or 742 posi unit for street and strip
[Re: BeEtLeJuIcE !]
#843955
11/04/10 10:20 PM
11/04/10 10:20 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
master
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master
Joined: Jun 2003
Posts: 4,872
connecticut
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iv put in serveral arb air lockers..they are more of a off road locker, and less like a limited slip, meaning when they are locked they arelocked! if replacing id recomned a detroit true trac, the street manners of an open rear but locks up under slip...its alot better than a stock suregrip hands down
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Ron
