O.T. F150 rear end leak 2006

red bearing · Jun 14, 2014

I have a small leak by the rear end on F150..It is leaking by the threads and nut that holds the pinion in.. dry everywhere else?..thanks in advance..

Bob · Jun 14, 2014

Oil is leaking past the splines inside the yoke.

Typically, the factory puts some king of goo in there to prevent this.

If you are comfortable taking the yoke off, clean it inside and the pinion splines, then wipe a ring of silicone sealant inside the opening in the yoke and put it back on.

Use a little Loctite on the pinion threads and tighten up the yoke appropriately so it"s TIGHT, but not tight enough to further squash the crush sleeve that sets pinion bearing pre-load.

I"m not sure what torque value a service manual would give for that application.

DENNIS MIN · Jun 14, 2014

Bob,

I mark the pinion nut-to-pinion with a black marker and carefully unthread it.

When I re-assemble that nut, I can get it really close to original.

Dennis.

ShadetreeRet · Jun 14, 2014

Don't they use pinion seals anymore? NAPA lists a seal for that application.

Bob · Jun 14, 2014

Shade, seal seals OUTSIDE of yoke, his leak is INSIDE, past the splines.

Bob 7337 · Jun 14, 2014

Take driveshaft off and tighten the nut. The nut is probabley probably loose causing it to leak

dbNga · Jun 14, 2014

I would highly suggest checking w/a manual. I was working on a "66 Mustang and its manual gives torque values for a new assembly and values for a used assembly. Marking threads/counting threads will get you in the neighborhood but you might be standing on the street of failure without knowing exact values.

cannonball · Jun 15, 2014

make sure you vent is open

O.T. F150 rear end leak 2006

red bearing

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