differential fluid change

[john34790]

I have a 97' F250 psd sb cewcab. I have never tried to changed the rear differential fluid before. How hard is it to do it? if so what types of fluid do you guys think and how much will I need to buy?

Thanks for your help. I just instaled Tymar intake bought from Dale and instaled 5" Magnaflow cat back exhaust.

[Marty]

Just remove bolts, drop pan, clean it out. Re-do gasket and replace... then fill with 75W90 I believe.

I have a video online somehwere on what and how to do it bue I can't find it.

[Marty]

I found Guzzle's...
Welcome to guzzle's Ford PSD Web Page

more specifically here...
Welcome to guzzle's Rear Differential Maintenance Web Page

Maintain has it covered.

[john34790]

Thanks, great web site.. Lots of good information.

[Mrvmax]

Originally Posted by john34790

I have a 97' F250 psd sb cewcab. I have never tried to changed the rear differential fluid before. How hard is it to do it? if so what types of fluid do you guys think and how much will I need to buy?

Thanks for your help. I just instaled Tymar intake bought from Dale and instaled 5" Magnaflow cat back exhaust.

I've done it on a few vehicles before. It's a simple task. I like Royal Purple synthetic, but I cannot remember how much I used. I think I bought 3 bottles. All you need is a new gasket, some brake parts cleaner (to clean up the inside after darining the gear lube) and the new fluid.

[fordnut85]

Remember, if you have a limited slip axle you need the correct friction additive!!

Originally Posted by fordnut85

Remember, if you have a limited slip axle you need the correct friction additive!!

Is that built into the lube or is it an additive? Please elaborate just a bit.

Rob

[Mrvmax]

Originally Posted by Powerstrokin'

Is that built into the lube or is it an additive? Please elaborate just a bit.

Rob

Royal Purple has it added already.

[Marty]

Originally Posted by Powerstrokin'

Is that built into the lube or is it an additive? Please elaborate just a bit.

Rob

Mobile 1 and Royal Purple state no additive needed. After doing a fluid change, I'd suggest you still do tight figure 8's in a parking lot and listen for noise. If you have any, then add some additive 1oz at a time until the noise goes away. Ford calls for 8oz, however 4-6 seems to be the amount to get the noise to stop. The less you use the more 'positive' your traction will be.

Originally Posted by Mrvmax

I've done it on a few vehicles before. It's a simple task. I like Royal Purple synthetic, but I cannot remember how much I used. I think I bought 3 bottles. All you need is a new gasket, some brake parts cleaner (to clean up the inside after darining the gear lube) and the new fluid.

I would advise against this since it breaks down grease (think about it getting down the axle tubes!) Using the brake cleaner on the diff cover, and a soaked rag for the mating surface would be ideal.