cone type rebuilds

[Don Dulmage <big-d@xxxxxxxxxxxx>]

The cone type are easily repairable too as long as the spider gear hasnt spun. With the unit out ofthe case sitting on the bench it is about 1 hours work. What happens to these units is te cone bottoms out in its cavity and nolonger has any wedge quality to make it drive both wheels. I chck them in the lathe and machine about 090 off of the small end where tey are bottomed out. I remeber the first time we tried it was in the 70s . I was concerned that the spring pressure wold not be sufficient but it turned out i worried for nothing. I have since done many many units. I dont know how many. I tell the skeptics when they say their cone type is kaput and cant be rebuilt no matter what i say i tell them "fine give it to me I will dispose of it for you." (And a couple have too much to my delight. !) The first was a full race car and we aw the times come right back where they were after the reair . 
The trick by the way to saving your posi whatever type it is is STAY IN THE WATEr for the entre burnout. By that I mean the wet spot after you rill out ofthe water trough. The tires still getthe heat but can slip enough to get a good burnout going without damage to the unit. Otherwise te lightest loaded wheel will sometimes grab with high traction and you are actually smoking just one wheel at 6000+rpm. I use a helper now to help stage if I am running a car with a non spool limited slip diff. I putrs an end to the  damage. I love burnouts and was brutal when doing them. I  hope I always am!
Don
Author of
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Old Reliable (Mopar)
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