RE: 8.75 Axle End Play

["Dennis C." <dennis.2914@xxxxxxxxx>]

I think you covered everything.  Maybe someone with experience with the 
489 will post a solution.

It makes it sound like it is a thrust block / axle length problem and 
yours are too long for the 3rd member.  

I don't have enough experience to know what to do however I would be 
concerned about adding shims to get clearance.  If the axle is too long 
would it result in too much bearing clearance?

Looking forward to what others say about your problem.

Dennis C.

Bill Maurits wrote:
> 
> I'll try to answer all questions & I apologize if I miss one...
> 
> I'm swapping pumpkins. The new one is a #9 case (2891489) 3.23 ratio.
> 
> The axles match the housing. It was a 2.93 open 'X' case.
> 
> I have no idea if the end-play was adjusted properly in the rear. I
> just pulled it apart.
> 
> This is not a tapered axle...it has the adjustable right side bearing.
> 
> I did not look at or add any metal shims. They go between the backing
> plate and housing...correct?
> 
> I've heard horror stories about Green bearing use on the street. I've
> heard they are not for street use as they don't take side stress
> (cornering) well.
> 
> OK...to attempt to re-clarify- When I bolt in the axles and follow the
> adjustment procedure in the FSM, (backing the adjuster off until it's
> even with the face of the mounting flange) I have no slack in the axle
> (no end play movement).
> 
> If I SOMEHOW determine that it's a thrust block problem, then what the
> hell do I do about it? Can I add shims to the axle housing ends to
> create my end play? What does this thrust block look like? IS the
> block in a SG rear thicker than an open rear? Are the SG axles somehow
> shorter that open axles? (I seem to remember a discussion about this)
> 
> Gary (mopar413)-Are referring to the metal shims as spacers?
> 
> I pulled this from the link posted earlier...
> http://www.autohobbydigest.com/8_75.html
> 
> "Any 8-3/4" center section may be interchanged for another as an
> entire assembly except for a thrust block difference of non-Suregrip
> units built before 1964.
> 
> there was a slight dimensional change in axle shaft length when the
> Sure Grip design changed. If interchanging axles with the slight
> difference, the threaded end play adjustment can be used to
> accommodate it."
> 
> My axle is a 65. Car was built in May of 65. When did this wonderful
> "slight dimensional change" take place and what was it???
> 
> ????????????????????????????????????????
> 
> -- 
> Bill M



1996 Dodge Ram 3500 Van Conversion
1964 Plymouth Belvedere 318 Auto
1963 Plymouth Sport Fury 383 4-speed
1949 Dodge Pickup 289/C4 soon to be changed
1998 Honda Valkyrie Standard


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