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Front Differential Leak

Big T

Big T

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Location
Fullerton, CA
I’ve forever had a slight leak (does not spot the pavement when parked) where the front driveshaft attaches to the front differential. The new 6.5 Optimizer install has pretty much eliminated the oil filter adapter as the source. I would like to replace the seal where the driveshaft yoke attaches to the front differential. Seems like an easy job, but I cannot figure out which is the right seal to get:

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It’s a 3.73 ratio front differential. Rear is 3.73 14-bolt full floater.
 
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