8 3/4 sure grip - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer 8 3/4 sure grip

Print Thread

8 3/4 sure grip #2005521 02/04/16 04:11 PM 02/04/16 04:11 PM
Joined: Jan 2004 Posts: 774 Western Pa farmboy70 OP super stock
farmboy70 OP super stock Joined: Jan 2004 Posts: 774 Western Pa	I recently picked this 489 case. The owner said it was a Detroit locker and he hated it because of the binding when parking. Can anyone identify if it is a Detroit locker from my pictures or let me know how to tell. Thank Dave Last edited by farmboy70; 02/04/16 04:12 PM.

Re: 8 3/4 sure grip [Re: farmboy70] #2005523 02/04/16 04:17 PM 02/04/16 04:17 PM
Joined: Dec 2003 Posts: 4,951 northwest USA N NANKET master
NANKET master N Joined: Dec 2003 Posts: 4,951 northwest USA	Not a Detroit locker. It is a clutch type sure grip, used from 1958 - 1968. The clutches go in there in a specific order, outlined in the factory service manual. If not in the right order it will be to tight, snapping and binding on corners. This will break the spider gears if driven that way.

Re: 8 3/4 sure grip [Re: farmboy70] #2005526 02/04/16 04:20 PM 02/04/16 04:20 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	That is a clutch type (power-lock) sure-grip. Looks like it has been apart. The owner is most likely running an incorrect (Dana 44) clutch pack or he did not add a bottle of friction modifier to the gear lube. Contact info

Re: 8 3/4 sure grip [Re: farmboy70] #2005528 02/04/16 04:20 PM 02/04/16 04:20 PM
Joined: Dec 2003 Posts: 4,951 northwest USA N NANKET master
NANKET master N Joined: Dec 2003 Posts: 4,951 northwest USA	Was a clutch type sure grip ever used by the factory in a 489 case?

Re: 8 3/4 sure grip [Re: NANKET] #2005545 02/04/16 05:07 PM 02/04/16 05:07 PM
Joined: Jan 2003 Posts: 25,858 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,858 Rio Linda, CA	When the 489 was first introduced in late '68 I believe the clutch-type SG was used in it. The INTERNET, the MISinformation superhighway

Re: 8 3/4 sure grip [Re: John_Kunkel] #2005550 02/04/16 05:26 PM 02/04/16 05:26 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	IMHO you lucked out as that is generally considered to be the cream of the limited slip crop for street cars that occasionally go to the dragstrip. The blue color arc around the pin appears to be induction hardening of that area. Or is it heat transmitted through the pin? Enquiring minds want to know. R. Last edited by dogdays; 02/04/16 05:28 PM.

Re: 8 3/4 sure grip [Re: farmboy70] #2005587 02/04/16 06:44 PM 02/04/16 06:44 PM
Joined: Jan 2004 Posts: 774 Western Pa farmboy70 OP super stock
farmboy70 OP super stock Joined: Jan 2004 Posts: 774 Western Pa	My mistake on the case number, I was working with three different axles this morning. It is a 742 case. Dave

Re: 8 3/4 sure grip [Re: farmboy70] #2005714 02/04/16 10:12 PM 02/04/16 10:12 PM
Joined: Jan 2004 Posts: 774 Western Pa farmboy70 OP super stock
farmboy70 OP super stock Joined: Jan 2004 Posts: 774 Western Pa	Thanks everyone for the help. I will tear it apart and see if there is any obvious damage. From what I have searched it looks like I could use this suregrip in a 489 case. Is that true? If so I could have the better suregrip with keeping my cars axle with the correct case numbers. Thanks again Dave

Re: 8 3/4 sure grip [Re: DoctorDiff] #2005717 02/04/16 10:21 PM 02/04/16 10:21 PM
Joined: Jan 2004 Posts: 774 Western Pa farmboy70 OP super stock
farmboy70 OP super stock Joined: Jan 2004 Posts: 774 Western Pa	Originally Posted By DoctorDiff That is a clutch type (power-lock) sure-grip. Looks like it has been apart. The owner is most likely running an incorrect (Dana 44) clutch pack or he did not add a bottle of friction modifier to the gear lube. The owner did say that when he bought the car ,the seller said it was rebuilt. He said other than that he has no info. If it looks OK inside I will be in touch for parts to rebuild it. Thanks Dave

Re: 8 3/4 sure grip [Re: dogdays] #2005720 02/04/16 10:23 PM 02/04/16 10:23 PM
Joined: Jan 2004 Posts: 774 Western Pa farmboy70 OP super stock
farmboy70 OP super stock Joined: Jan 2004 Posts: 774 Western Pa	Originally Posted By dogdays IMHO you lucked out as that is generally considered to be the cream of the limited slip crop for street cars that occasionally go to the dragstrip. The blue color arc around the pin appears to be induction hardening of that area. Or is it heat transmitted through the pin? Enquiring minds want to know. R. No idea, Dr Diff a little help here. LOL

Re: 8 3/4 sure grip [Re: farmboy70] #2005931 02/05/16 03:24 AM 02/05/16 03:24 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	The heat signature around the V-ramps is due to induction hardening. Contact info

Re: 8 3/4 sure grip [Re: DoctorDiff] #2005945 02/05/16 04:06 AM 02/05/16 04:06 AM
Joined: May 2008 Posts: 171 Las Vegas, NV C chargerbr549 member
chargerbr549 member C Joined: May 2008 Posts: 171 Las Vegas, NV	Dr Diff, what is the difference between the 8.75 Power Lok and Dana 44 Power Lok 30 spline rebuild kit? I thought that most of the internal parts were interchangeable between the two?

Re: 8 3/4 sure grip [Re: dogdays] #2006072 02/05/16 02:26 PM 02/05/16 02:26 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Originally Posted By dogdays IMHO you lucked out as that is generally considered to be the cream of the limited slip crop for street cars that occasionally go to the dragstrip. The blue color arc around the pin appears to be induction hardening of that area. Or is it heat transmitted through the pin? Enquiring minds want to know. R. Pretty sure it's hardening , everyone I have seen looks like that . running up my post count some more .

Re: 8 3/4 sure grip [Re: farmboy70] #2006100 02/05/16 03:03 PM 02/05/16 03:03 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	OEM 8.75" Power-locks used an odd-ball thin plate on the end of the clutch pack. Dana 44 Power-locks used all thick plates. Contact info

Re: 8 3/4 sure grip [Re: farmboy70] #2008093 02/08/16 06:49 PM 02/08/16 06:49 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	Unless you have a specific reason for going with the 489 housing, I'd stick with the 742. No crush sleeve, or crush sleeve eliminator needed. Easier to set up IMO and less stuff to buy or replace.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1