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Gary, ASE Certified Technician
Category: Ford
Satisfied Customers: 918
Experience:  Senior Technician
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ThereI want to ask you about the front differential

Customer Question

hi there I want to ask you about the front differential pinion nut , what should be the torque specs for it ? I been told to use 1/2 inch impact gun I did a seal but It started getting noisy at high speed I loosen the nut a bit sounds like th sound good less loud let me know because I didn't mark it , thanks    2005 ford explorer

Submitted: 2 years ago.
Category: Ford
Expert:  Gary replied 2 years ago.
As with any pinion nut, there is torque for spec for pinion bearing preload.
To do a pinion oil seal, you should have marked the end of the pinion, the nut, and the flange with light centrepop mark where all 3 dots will line up again. Without any markings, who knows where you are now.
If the diff went noisy, I'd say you have damaged the pinion bearings.
What sort of car is this for?
Customer: replied 2 years ago.

its a 2005 ford explorer , I its noisy at high speed , its front diffrential seal

I did and the ford mechanic on here told me no need preload . for the

front just the back that is why i didn't mark it .

Customer: replied 2 years ago.

it was really noisy when I go over 100km/h when I am at low speed

it doesn't make any noise but now the noise has went better maybe

not serious ? I am thinking of leaving it or loose in it little bit more to see

if the noise goes away at high speed what you think ?

Expert:  Gary replied 2 years ago.

Well, you may be lucky if the noise has gone away, back it off a "fraction" before you drive any more.

Lesson learnt here is always mark components that are assembled with a nut where a shaft has bearings at opposing ends, ie: diff pinions, gearbox countershafts etc. Hope you can sort it. Gary

Customer: replied 2 years ago.

why it makes noise at high speed ? and not at low ? I am going to try to loose it a bit more but just enough not to come off ,

Expert:  Gary replied 2 years ago.
You should have some idea of where the nut was originally, by looking at the end of the pinion thread.
There would normally be at least half a thread past the top of the nut.