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Sure Grip rebuild #3201698 01/02/24 03:17 PM 01/02/24 03:17 PM
Joined: Mar 2003 Posts: 18,678 Fresno, CA Jim_Lusk OP I Live Here
Jim_Lusk OP I Live Here Joined: Mar 2003 Posts: 18,678 Fresno, CA	My son's Dart already has a sure grip, but yesterday we discovered that it may not be working properly. We were working on the hydraulic clutch and wanted to make sure the clutch was disengaging. With the trans in first and clutch out he could spin one side and the other side was spinning opposite indicating that the SG may be worn out. Dr Diff has a clutch pack for $117. Is that likely all we'll need? How difficult is the rebuild?

Re: Sure Grip rebuild [Re: Jim_Lusk] #3201700 01/02/24 03:20 PM 01/02/24 03:20 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Which type and year posi unit? The Dana 8 3/4 clutch type posi are rebuildable, the cup and cone type are not that I know of Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Sure Grip rebuild [Re: Jim_Lusk] #3201723 01/02/24 04:14 PM 01/02/24 04:14 PM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Originally Posted by Jim_Lusk My son's Dart already has a sure grip, but yesterday we discovered that it may not be working properly. We were working on the hydraulic clutch and wanted to make sure the clutch was disengaging. With the trans in first and clutch out he could spin one side and the other side was spinning opposite indicating that the SG may be worn out. Dr Diff has a clutch pack for $117. Is that likely all we'll need? How difficult is the rebuild? Is it a clutch or cone , the DR. diff kit is for a clutch, assuming you know how to set up and 8 3/4 chuck it's not hard , follow the service manual and note what the backlash is before taking the diff unit out to rebuild. I believe the case bolts are left hand thread . running up my post count some more .

Re: Sure Grip rebuild [Re: Cab_Burge] #3201727 01/02/24 04:20 PM 01/02/24 04:20 PM
Joined: Jan 2003 Posts: 25,753 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,753 Rio Linda, CA	Originally Posted by Cab_Burge Which type and year posi unit? The Dana 8 3/4 clutch type posi are rebuildable, the cup and cone type are not that I know of They're not "rebuildable" but they're repairable. Worn cones can be machined and Doc Diff offers a shim kit. The INTERNET, the MISinformation superhighway

Re: Sure Grip rebuild [Re: John_Kunkel] #3201826 01/02/24 09:50 PM 01/02/24 09:50 PM
Joined: Mar 2003 Posts: 18,678 Fresno, CA Jim_Lusk OP I Live Here
Jim_Lusk OP I Live Here Joined: Mar 2003 Posts: 18,678 Fresno, CA	To my knowledge it's the unit I pulled from a '68 Coronet wagon. We've swapped carriers into different third members (on the recommendation of a local gear shop) with no issues so I'm not really worried about pulling the carrier out. If this is the carrier I think it is that's what we did. The Coronet had 2.94 gears and we put the SG into a case with 3.23s.

Re: Sure Grip rebuild [Re: Jim_Lusk] #3201836 01/02/24 10:24 PM 01/02/24 10:24 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	That should be a Dana brand clutch type early posi, good stuff and rebuildable Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Sure Grip rebuild [Re: Cab_Burge] #3201883 01/03/24 09:30 AM 01/03/24 09:30 AM
Joined: Dec 2004 Posts: 2,367 Wheatfield, NY Cuda340 top fuel
Cuda340 top fuel Joined: Dec 2004 Posts: 2,367 Wheatfield, NY	Also a 68 power-loc will have the one piece side gears, the earlier units had two piece side gears and you would have to use the axles to align the splines before tightening the unit back together after a clutch rebuild.

Re: Sure Grip rebuild [Re: Jim_Lusk] #3201921 01/03/24 12:55 PM 01/03/24 12:55 PM
Joined: Jan 2003 Posts: 25,753 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,753 Rio Linda, CA	Originally Posted by Jim_Lusk To my knowledge it's the unit I pulled from a '68 Coronet wagon. Most sources show the introduction of the cone-type Sure-Grip as being in '69 but is was actually introduced on January 9, 1968. Only a visual inspection will show what it is. The INTERNET, the MISinformation superhighway

Re: Sure Grip rebuild [Re: Cuda340] #3201975 01/03/24 04:30 PM 01/03/24 04:30 PM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Originally Posted by Cuda340 Also a 68 power-loc will have the one piece side gears, the earlier units had two piece side gears and you would have to use the axles to align the splines before tightening the unit back together after a clutch rebuild. Learned something new , I've only seen 2 piece side gears in the few I have owned , now I have something to look for . running up my post count some more .

Re: Sure Grip rebuild [Re: JohnRR] #3201979 01/03/24 04:38 PM 01/03/24 04:38 PM
Joined: Dec 2004 Posts: 2,367 Wheatfield, NY Cuda340 top fuel
Cuda340 top fuel Joined: Dec 2004 Posts: 2,367 Wheatfield, NY	Originally Posted by JohnRR Originally Posted by Cuda340 Also a 68 power-loc will have the one piece side gears, the earlier units had two piece side gears and you would have to use the axles to align the splines before tightening the unit back together after a clutch rebuild. Learned something new , I've only seen 2 piece side gears in the few I have owned , now I have something to look for . It was a mid 68 thing from my understanding prior to them phasing in the non-rebuildable units.

Re: Sure Grip rebuild [Re: Cuda340] #3201990 01/03/24 05:56 PM 01/03/24 05:56 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Originally Posted by Cuda340 Also a 68 power-loc will have the one piece side gears, the earlier units had two piece side gears and you would have to use the axles to align the splines before tightening the unit back together after a clutch rebuild. All the Dana brand 8 3/4 posi had two piece side gears, the later Eatons did not have clutches or the same type spider gears like the Dana 8 3/4 posi units had If you can see springs inside the posi it is an Eaton type, not a clutch type Dana brand Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Sure Grip rebuild [Re: Cab_Burge] #3202214 01/04/24 02:08 PM 01/04/24 02:08 PM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Originally Posted by Cab_Burge Originally Posted by Cuda340 Also a 68 power-loc will have the one piece side gears, the earlier units had two piece side gears and you would have to use the axles to align the splines before tightening the unit back together after a clutch rebuild. All the Dana brand 8 3/4 posi had two piece side gears, the later Eatons did not have clutches or the same type spider gears like the Dana 8 3/4 posi units had If you can see springs inside the posi it is an Eaton type, not a clutch type Dana brand Cab the cone type used by Chrysler was made by Borg Warner . running up my post count some more .

Re: Sure Grip rebuild [Re: JohnRR] #3202256 01/04/24 06:49 PM 01/04/24 06:49 PM
Joined: Dec 2014 Posts: 5,783 ohio R ruderunner master
ruderunner master R Joined: Dec 2014 Posts: 5,783 ohio	Isn't Eaton currently making them? I know BW sold off alot of their designs. Angry white pureblood male

Re: Sure Grip rebuild [Re: ruderunner] #3202308 01/04/24 10:18 PM 01/04/24 10:18 PM
Joined: Jan 2003 Posts: 15,315 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,315 Omaha Ne	I was just thinking, wouldn't it be better just to replace the unit ? might be cheaper as well www.tandmautomotive-omaha.com

Re: Sure Grip rebuild [Re: TJP] #3202312 01/04/24 10:28 PM 01/04/24 10:28 PM
Joined: Mar 2003 Posts: 18,678 Fresno, CA Jim_Lusk OP I Live Here
Jim_Lusk OP I Live Here Joined: Mar 2003 Posts: 18,678 Fresno, CA	I think we've decided that it won't get done real soon. Found out the main brake line is clogged yesterday, so I guess we're doing brake lines.

Re: Sure Grip rebuild [Re: JohnRR] #3202356 01/05/24 04:25 AM 01/05/24 04:25 AM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	I was told back when the Mopar drag team did their seminars that Dana corp. provided all the pre 1969 clutch type 8 3/4 posi units, I don't remember if it was Tom Hoover, Dick Maxwell or who now Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Sure Grip rebuild [Re: TJP] #3202365 01/05/24 08:35 AM 01/05/24 08:35 AM
Joined: May 2005 Posts: 1,966 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,966 Apollo, PA.	Originally Posted by TJP I was just thinking, wouldn't it be better just to replace the unit ? might be cheaper as well Aren't clutches like 60 bucks?

Re: Sure Grip rebuild [Re: ruderunner] #3202381 01/05/24 10:00 AM 01/05/24 10:00 AM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Originally Posted by ruderunner Isn't Eaton currently making them? I know BW sold off alot of their designs. Eaton, Auburn , BW , no matter who makes it they all have one thing in common ... GARBAGE design ... running up my post count some more .

Re: Sure Grip rebuild [Re: B1MAXX] #3202383 01/05/24 10:01 AM 01/05/24 10:01 AM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Originally Posted by B1MAXX Originally Posted by TJP I was just thinking, wouldn't it be better just to replace the unit ? might be cheaper as well Aren't clutches like 60 bucks? $79 from Dr. diff withthe 2 thin plates that the factory design used , I ended having to scavenge 2 when I rebuilt one because the MP kit I got had all thick plates . https://www.doctordiff.com/powr-lok-clutch-pack.html?variation_id=237 vs. a new powerlock at $395 ... https://www.doctordiff.com/8-3-4-clutch-type-sure-grip-powr-lok.html Last edited by JohnRR; 01/05/24 10:02 AM. running up my post count some more .

Re: Sure Grip rebuild [Re: JohnRR] #3202463 01/05/24 02:06 PM 01/05/24 02:06 PM
Joined: Sep 2003 Posts: 19,366 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,366 north of coder	just weld up the spider gears and the clutch plates..................

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