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2000 mack rd 688 rear wheel seal


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Does anyone have the part number for national seal wheel seal

I got a seal from mack stemco brand leak same day I put it on and cost 77.00 dollars 

I have replaced 1 before but can't remember or  find the part number 


Need to order 1 in the am so I can be ready Monday 


The stemco was hard to get over the mounting area then wouldn't turn once it was on so I know it was going to fail but mack had closed and I was trying to work 


Thank you for your help


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I forgot to ask if you have mack rears,, also, was there a wear ring on the spindle and you installed 393-0173 stemco, that is why it was tight... the wear ring needs to come off, buff the spindle and if it is not damaged you can use the stemco seal, if it ha light damage,  the 2 piece stemco seal kit is what you need... there are specific drivers to do the installs,  can you post the stemco seal you used, I have a chart and can cross it that way.... 

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