Re: Sure Grip Test Proceedure ???

["Gary H." <spigot2039@xxxxxxxxxxx>]

My understanding is that, given the rear is in operating condition, with one rear wheel off the ground and the transmission in neutral, if you spin the wheel and the driveshaft turns it is an open rear. The spider gears that connect the two wheels have various types of mechanisms to try to connect the axles in a way to make them spin at the same speed, with minimal spider gear activity: thus "SureGrip" in Mopar terminology.

In either type of rear ends, under good traction conditions the power is distributed to both rear wheels. When power overcomes traction available the wheel with the least traction will spin. An open differential will spin the wheel with least traction while a SureGrip will compensate and distribute the power more evenly so both rear wheels turn -- or spin -- depending on the traction of the surface available.

Thanks,
Gary H. 



-----Original Message----- 
>
>
>Some time ago I remeber reading a method to determine if a 8-3/4" was a 
>SureGrip or not.  The car had to be on stands and it required two people to 
>do it....One held a wheel and the other turned one backwards or something 
>like that.  If anybody can outline this proceedure correctly and in detail I 
>would much appreciate the info.  I don't know if it has any bearing in the 
>results, but the rear under my '64 wagon in question, is supposed to be from 
>a '70 B-Body.  I'm really confused on this at the moment: on asphalt, the 
>dark mark left from the passenger side would indicte an open rear....on 
>concrete, it leaves a very uniform and consistant amount of mark in a Pair 
>of tracks.  During the the wheel alignment, the tech said he felt a 
>vibration in the rear, sort of a chattering resistance through part of a 
>single wheel rotation.  He thinks this indicates a bad carrier bearing.  The 
>leveling beams for the alignment rack were on both rear wheels when this 
>vibration was felt. Could this have been a SG unit just indexing normally? I 
>installed the rear to replace the original '64 piece. We checked the center 
>section of the supposed '70 3.23 to find it was a 2.74, (or something close 
>to that). We then installed another 3.23 and threw it under the wagon.  That 
>was soooo many years ago I don't remeber the details on the chunk we did 
>install.  I really hope somebody here can shed some light on this because I 
>don't know whether to be delighted that I have a SureGrip or really worried 
>that the rear is about shot......help!
>
>thanks in advance to any and all who reply,
>John Hammond
> 


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