hey so i have a 99 ford 150
i recently realized my pinion seal was leaking i took it to my mechanic he said i have 1/4 inch of play
question 1 wouldn't i feel i major vibration
question 2 wouldnt i feel clunks hear bangs etc
question 3 has anyone done pinion bearings themselves ?

 

If you had a 1/4 inch of play anywhere that is a bad thing. You would have definately felt something going from drive to reverse. I have done a lot of pinion bearings over the years (40+). It is a time consuming job and there is some setup specs that need to be adhered to. Such as side gear clearance, backlash, contact pattern, pinipn depth and pinion bearing preload. Good luck.

 

and thats it i have no noises or vibrations all i know is my pinion seal is leaking i havent had a chance to look at it my self due to finding an avialible shop and the fact it just snowed 6 inches

 

You can change the pinion seal in the driveway. Just jack up rear end and safely support it on jack stands. The easy way to get the proper torque on tightening the nut iios to measure the torque it needs to break it loose.

 

For my own info, How is this 1/4 inch ply being measured?
Is it up and down at the pinion flange or is it in & out,
or is it being measured by how much the driveline rotates?
If it is up & down or in & out at the flange you received your answer from way2old
and I agree with it.
Did you recheck it yourself?

 

I agree with way2old and hanky.

Also, if just the seal is bad you won't feel any vibration; if it is the bearing, you would know it pretty fast.

 

i have no checked it myself due to the 6 inches of snow that fell over night and the diff does have 255 thousand on it i'm not to sure my truck does go to fountain tire tomorrow to be checked also has anyone heard of lubrico warantee?

 

okay so i got er on a lift there is abou 1/8 inch play in and out and 1/32 up down side to side