8 3/4 mopar

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dondon
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8 3/4 mopar

Post by dondon » Sat Sep 08, 2018 4:46 pm

Is it necessary to remove the thrust block from the carrier when you put in green bearings on an 8 3/4 mopar rear end axles? Thanks.

Diodedog
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Re: 8 3/4 mopar

Post by Diodedog » Sat Sep 08, 2018 10:00 pm

Yes, it should be removed or the axle may touch it before the bearing seats.

Geoff2
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Re: 8 3/4 mopar

Post by Geoff2 » Sun Sep 09, 2018 2:36 am

All the Mopar 8 3/4" rears I have seen had one wheel brg that was adjustable via a castellated nut to adjust this preload.

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bigblockmopar
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Re: 8 3/4 mopar

Post by bigblockmopar » Sun Sep 09, 2018 5:15 am

The Green (ball) bearings remove that adjustability as they are fixed in position with a simple retainer plate, instead of the adjuster on one side.
The axle ends don't (shouldn't) touch anything in the center anymore.

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Re: 8 3/4 mopar

Post by j-c-c » Sat Sep 15, 2018 2:15 pm

When you say "thrust block", do you mean the two small round thrust caps inserted and installed and held by a press pin?
Life gets complicated if these two thrust pins separate upon an axle removal, and drop anywhere inside they shouldn't.

One thing not considered yet here, if one was ordering new axles, they could be slightly shorter I suspect and this question would then also be resolved, or use a cut off wheel and shorten your axles and dress them, not sure why the two last would be one's first choice, but it would solve the issue.

dondon
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Re: 8 3/4 mopar

Post by dondon » Sun Sep 16, 2018 11:00 pm

the thrust block is used in the cone type posi unit and some one wheel differentials, the pin type is used in the clutch type posi. I am dealing with the cone type. I thought about shortening the axles but that creats problems when I want change pumpkins when I want to run it at the dragstrip. After I get the "A" body axles drilled to 4.5 B.C. I will find out for sure.

dondon
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Re: 8 3/4 mopar

Post by dondon » Thu Sep 27, 2018 3:30 am

I measured a thrust block form a cone posi and a pin from a clutch posi. They both measured about 1.50 inches. I put the axles in another "A" body housing without the backing plates, that measured about 1.350 between the axle ends, so I figured I"m safe with the backing plates and a gasket on both ends

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