2005 f-150 pinion seal, already did it once and now it’s starting to leak a little bit again. Any tips on what to do to prevent a leak? Thinking of putting some of that gasket maker sealant on there,I really don’t want to have to do this a third time because it wasn’t easy. Thanks for any tips.

Guessing you just replaced the seal and not the nut and collapsible spacer?

Replace the yoke this time.

Yes just the seal. Was planning on putting a new pinion nut this time around because the threads could get warn down and start to slip.

This is a good thread to follow.

https://www.f150online.com/forums/2004-2008-f-150/474995-how-replace-pinion-seal-2004-2008-a.html




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Great Post. Here Is What the Manual Recommends for Tightening the Nut
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I hope to do the replacement soon and will see if I can use the torque stuff from the manual (below) and your method and see if I get the same result. I'll report back here.

This is from the manual:

During Removal:
"Remove the rear brake drums. (This is so they don't drag and disturb the torque measurment)

4. Install an inch-pound torque wrench on the pinion nut and record the torque required to maintain rotation of the pinion through several revolutions.

5. CAUTION:
After removal of the pinion nut, discard it. A new nut must be used for installation.

For Installation:
Under no circumstances is the pinion nut to be backed off to reduce preload. If reduced preload is required, a new collapsible spacer and pinion nut must be installed.

Using the special tool to hold the pinion flange, tighten the pinion nut. (This is just an arm like bar that is bolted to the flange to keep it from rotating)

Rotate the pinion occasionally to make sure the cone and roller bearings are seating correctly.

Install a Nm (inch-pound) torque wrench on the pinion nut.

Rotating the pinion through several revolutions, take frequent cone and roller bearing torque preload readings until the original recorded preload reading is obtained.

If the original recorded preload is lower than specifications, tighten to the appropriate specifications for used bearings (8 to 14 in-lbs). If the preload is higher than specification, tighten the nut to the original reading as recorded.