Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive

Forums Calendar Active Threads Search Forum Help
Previous Thread
Next Thread
Print Thread
Should I buy this 8 3/4 sure grip center chunk? #1697361
11/11/14 12:22 AM 11/11/14 12:22 AM
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
plazomat Offline OP
mopar
plazomat  Offline OP
mopar

Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
I can get this locally for about $300 - not sure if its worth the buy?

489 case with 2.89 gears open diff + a used sure grip unit 3.23 with a few broken teeth...see pic please..

Seller says the SG is good, he got it with other parts...how can I tell?

Or cause the teeth broke just run away...

Plaz
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697362
11/11/14 12:26 AM 11/11/14 12:26 AM
Joined: Aug 2003
Posts: 4,384
Madison Wi
NTOLERANCE Offline
master
NTOLERANCE  Offline
master

Joined: Aug 2003
Posts: 4,384
Madison Wi
I don't see a pic. Does the s/g have clutches?

I used to care but....... things have changed
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697363
11/11/14 12:31 AM 11/11/14 12:31 AM
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
plazomat Offline OP
mopar
plazomat  Offline OP
mopar

Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
Second try..

8327714-centerchunk.JPG (325 downloads)
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697364
11/11/14 12:41 AM 11/11/14 12:41 AM
Joined: Aug 2003
Posts: 4,384
Madison Wi
NTOLERANCE Offline
master
NTOLERANCE  Offline
master

Joined: Aug 2003
Posts: 4,384
Madison Wi
I would say no

That's a cone type sure grip and while it's not a bad unit it's not rebuild able Well it sorta is. To have to do some machining and it's good to go again. For awhile.

Unless you need the other items id pass. The ratios are poor and one is broken so it makes me question the condition of the s/g.

I used to care but....... things have changed
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: NTOLERANCE] #1697365
11/11/14 12:44 AM 11/11/14 12:44 AM
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
plazomat Offline OP
mopar
plazomat  Offline OP
mopar

Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
Thanks for the help...I'll pass.

Plaz
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697366
11/11/14 12:44 AM 11/11/14 12:44 AM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
Striving for excellence
Kern Dog  Offline
Striving for excellence

Joined: Feb 2010
Posts: 18,493
Granite Bay CA
UNLESS you can do a tension test to asses the integrity of the differential, you have to play it safe and assume that the CONE diff is worn out. I'd never buy a used cone diff without a test.
My axle guy puts the diff in a vise and locks one axle down, then tries to spin the other axle with a torque wrench. If the unit slips at anything under 80 ft/lbs, the unit is on its way out.
CONE differentials can be rebuilt but there are some drawbacks to that. It is because of this that even the factory suggested total replacement in the event of excessive wear.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: Kern Dog] #1697367
11/11/14 12:47 AM 11/11/14 12:47 AM
Joined: Aug 2003
Posts: 4,384
Madison Wi
NTOLERANCE Offline
master
NTOLERANCE  Offline
master

Joined: Aug 2003
Posts: 4,384
Madison Wi
Can't you buy a new sure grip for $400 or so?

I used to care but....... things have changed
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: NTOLERANCE] #1697368
11/11/14 12:51 AM 11/11/14 12:51 AM
Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
Pacnorthcuda  Offline
Too Many Posts

Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
Quote:

Can't you buy a new sure grip for $400 or so?



They've been on back order for over a year...don't know why, Doc Diff would know.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: Pacnorthcuda] #1697369
11/11/14 12:59 AM 11/11/14 12:59 AM
Joined: Jan 2003
Posts: 8,016
Polson, MT
DoctorDiff Offline
master
DoctorDiff  Offline
master

Joined: Jan 2003
Posts: 8,016
Polson, MT
New 8.75" (power-lock) clutch internals are available, but the carriers are not. I'm currently having my own carriers made by a different manufacturer.

Complete units should be available by spring.

Contact info
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: DoctorDiff] #1697370
11/11/14 03:47 AM 11/11/14 03:47 AM
Joined: Jan 2003
Posts: 4,152
SO. CAL.
7
70blackfish Offline
master
70blackfish  Offline
master
7

Joined: Jan 2003
Posts: 4,152
SO. CAL.
I agree with above, don't buy it.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: 70blackfish] #1697371
11/11/14 11:42 AM 11/11/14 11:42 AM
Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
B
bigblock340power Offline
master
bigblock340power  Offline
master
B

Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
I would take this guys advise. Watch towards the end of the vid. around 3.35 on. That's what I'd do!
http://www.youtube.com/watch?v=ZfL4xKQeSfo
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: bigblock340power] #1697372
11/11/14 06:53 PM 11/11/14 06:53 PM
Joined: Dec 2003
Posts: 22,696
Bitopia
J
jcc Offline
If you can't dazzle em with diamonds..
jcc  Offline
If you can't dazzle em with diamonds..
J

Joined: Dec 2003
Posts: 22,696
Bitopia
If its a 2.89, yes, its one of one

18/52 R/P tooth count?

Otherwise, No, plenty of other bigger fish in the pond.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: jcc] #1697373
11/11/14 07:41 PM 11/11/14 07:41 PM
Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
plazomat Offline OP
mopar
plazomat  Offline OP
mopar

Joined: Aug 2003
Posts: 643
Toronto, Ontario, Canada
Quote:

If its a 2.89, yes, its one of one




Oh man how many of you caught that one and didn't call me out.....

Plaz
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697374
11/11/14 09:17 PM 11/11/14 09:17 PM
Joined: Jun 2006
Posts: 5,163
CT
GTX MATT Offline
master
GTX MATT  Offline
master

Joined: Jun 2006
Posts: 5,163
CT
Not worth 300, I'd say the SG unit it worth 100. Value the rest at what you want.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: GTX MATT] #1697375
11/12/14 12:38 AM 11/12/14 12:38 AM
Joined: Jan 2003
Posts: 75,058
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,058
U.S.S.A.
Quote:

Not worth 300, I'd say the SG unit it worth 100. Value the rest at what you want.



the sure grip may be worth $100 but only if it's not junk ... but it's a cone type so it's already JUNK by design.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: JohnRR] #1697376
11/12/14 02:41 AM 11/12/14 02:41 AM
Joined: Aug 2003
Posts: 4,384
Madison Wi
NTOLERANCE Offline
master
NTOLERANCE  Offline
master

Joined: Aug 2003
Posts: 4,384
Madison Wi
Quote:

Quote:

Not worth 300, I'd say the SG unit it worth 100. Value the rest at what you want.



the sure grip may be worth $100 but only if it's not junk ... but it's a cone type so it's already JUNK by design.



Haven't you read all these posts about cone types surviving 600 hp for years?

I agree. Junk. The powr loc designed clutch type is the way to go for performance
That being said for a driver stock engine car. Eh doesn't matter I guess

I used to care but....... things have changed
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: plazomat] #1697377
11/12/14 05:40 AM 11/12/14 05:40 AM
Joined: Apr 2012
Posts: 1,235
Phoenix, AZ
Jjs72D Offline
Deep in the closet
Jjs72D  Offline
Deep in the closet

Joined: Apr 2012
Posts: 1,235
Phoenix, AZ
A cone unit is better than nothing if you can get it cheap.
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: NTOLERANCE] #1697378
11/12/14 12:13 PM 11/12/14 12:13 PM
Joined: Jan 2003
Posts: 28,068
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,068
Irving, TX
Quote:

Haven't you read all these posts about cone types surviving 600 hp for years?




The cone type survived for 12 years behind the TT440 with manual and automatic transmissions.

It was still locking up and making traction in the end despite the locking screw for the cross pin breaking. When that happened the pin spun in the case and ate the diff. However, the cones were still holding the axles together.

I ended up replacing it with a TrueTrac.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: Should I buy this 8 3/4 sure grip center chunk? [Re: feets] #1697379
11/12/14 03:52 PM 11/12/14 03:52 PM
Joined: Jan 2003
Posts: 75,058
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,058
U.S.S.A.
Quote:



It was still locking up and making traction in the end despite the locking screw for the cross pin breaking. When that happened the pin spun in the case and ate the diff. However, the cones were still holding the axles together.





That happened because the spiders on that shaft had welded them selves to the shaft, it wasn't in as good a shape as you think ... but at least you had fun ...

Re: Should I buy this 8 3/4 sure grip center chunk? [Re: JohnRR] #1697380
11/12/14 07:03 PM 11/12/14 07:03 PM
Joined: Jan 2003
Posts: 28,068
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,068
Irving, TX
Quote:

Quote:



It was still locking up and making traction in the end despite the locking screw for the cross pin breaking. When that happened the pin spun in the case and ate the diff. However, the cones were still holding the axles together.





That happened because the spiders on that shaft had welded them selves to the shaft, it wasn't in as good a shape as you think ... but at least you had fun ...



Yep. One was stuck pretty good but the other was free. Still, the cones were working as designed.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon

Moderated by  Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer 
Privacy Policy · Forum Rules · Mark All Read Contact Us · Moparts




Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive


Powered by UBB.threads™ PHP Forum Software 7.7.1