Hey guys... So i searched for the last 2 hours on looking up my rear diff for my 00 F250 Crew cab V10 Auto. My vin code Axle is Blank and my diff cover is a ford aftermarket one the preivous owner put on so i have no metal tab. I found on the FRONT axle a manufactor barcode scanner and numbers with a box with 3.73 and then another little box with STD. Rear had a barcode too but only had a H 141 number. FYI this started when i noticed fluid leaking out of my pinion seal to the driveshaft on the rear. Help guys...

 

The rear diff in the single rear wheel trucks is the sterling 10.5. (with 3.73s I take it you have a srw) If you have 3.73s in the front axle (front axle comes with a std non-ls diff) you will have 3.73s in the rear UNLESS the truck had a gear swap at some point. With 31"-33" tires and 3.73 gear you should be right around 2k rpm @ 70mph in OD.

If your front pinion (and your bearings are fine) seal leaks replacing the seal is not a big job. My dad just got the front pinion seal replaced on his 03' at the dealership and it was well under $200. Might be a good time to change the 75w140 gear oil in the rear diff also. Best bet is to use Amsoil Severe Gear oil so you won't have to deal with adding friction modifier if you have a LS rear diff Ford makes an aluminum rear cover for the sterling 10.5" that is pretty cheap and helps keep the fluid cool.

Anything else you want to know?

 

Thanks, i think that is what the pre owner got from Ford was this cooling finned cover. Fluid front was changed and the rear was changed with 75 140 about 13k miles ago by jiffy lube i found in the glove box. Who knows how well jiffy lube does ring and pinion work though.

 

I'd pull the fill plug on both the front and rear diffs to check the color of the oil, make shure its thick and smells like gear oil and the level is correct. I honestly wouldn't trust Jiffy lube to oil a bicycle but thats just me.

 

See that is how i feel too! Atleast am not the Only one that feels like that... Fluid level should be right at the fill plug on front and rear correct?

 

Correct. Usually right at the bottom of the hole. Make shure the truck is fairly level when you pull the plugs to check the level. Might want to take a peak at the fluid level on the transfer case also.(Pull teh top plug) The transfer case only holds 2 quarts of ATF so its quick and easy to change. I used Amsoil ATF in the transfer case. BTW I put some teflon tape (for plumbing) on the plug threads to help seal the threads. (2 wraps)

 

I should be oiling my bicycle?