Hi everyone,

Looked under the truck the other day to find gear oil leaking from where the drive-line goes into the rear end, bad enough that it flings oil on my exhaust so I can smell burning gear oil. Anyone ever had this happen before? Was wondering if there is a gasget there or if something just needed to be re-siliconed, thanks in advance for the help. Lance

 

Hey Lance. I am in the same boat as you. The only difference is I have the Dana-80. There is a gasket/seal that goes in the pinion. You might need to get a crush seal from what I have read. Some one will know more then me on this.

Good luck.

 

This help ?

Dana 80
https://www.motorcraftservice.com/pu...0/S1O52A05.HTM

Ford 10.5
https://www.motorcraftservice.com/pu...0/S1O52D10.HTM

 

Crap, I don't have all those tools. Do I really need them?

 

Not to discourage anyone, but the pinion nut needs over 400 lbs-ft of torque in order to be properly refastened. I would have a shop do it, unless you can get 400+ on a torque wrench. The sterling 10.5 still uses a crush sleeve and if you over torque it you have to re do everything. The pinion seal went bad on mine, and I guess the diff lost enough gear oil to ruin the pinion bearings a year later and I had to replace the whole rear end...

 

With the Ford 10.5, you are definetly going to need a new crush sleeve. If you don't will cost you the price of a new trans. Did it and will NEVER do it again!!!

 

robinson, can you elaborate on what happened to you?

 

Anyone know the poundage to torque the pinion nut to? Thanks for the help

 

I know on the Dana-80, it's 470 ft lbs. I don't know on the 10.5, but I will look for it.

 

Yes I can, I replaced the seal on my Ford 10.5 and did not replace the crush sleeve, didn't know you had to do that. Was about a month later and I picked up a slight vibration when I was on the way to the girlfriends. Left her house and was exiting the expressway and the vibration got bad for about 3 seconds then it went away. Drove it about 25 miles home after dark and was going to check it out when I got up in the morning. Went to back it into the shop for the night and I had no reverse, jumped out and looked under my truck and there was trans fluid pouring out of the trans. Come to find out, not changing the crush sleeve caused the pinion bearings to go out. When I was exiting the expressway and I had the bad vibration, it was the bearings finally giving way. When it vibrated hard like it did, it cracked the trans case all of the way around. So I had about $4000 in new trans and having the rearend rebuilt. Sucked but will never do it again. Looked under my truck the other day and the pinion seal is leaking again. Leaving it until it gets bad enough to leave a spot on the floor overnight. I just keep an eye on the fluid. Never want to go through that again.

 

do you not have a center support bearing on the intermediate driveshaft? I would have thought the carrier bearing would have dampened the vibrations enough not to crack the trans case.... Glad mine didn't do that!

 

Yes I do but that did not help. I slammed on the brakes but I must have cracked it then. Yes it only cracked because I did not replace the crush sleeve. I still blame it on the girlfriend cause I was on my way from her house. Dang girlfriends!!! LOL Cost you more money than they are worth.

 

I know how that goes... haha. Anyway, I looked around for torque values and couldn't find them. But, if you do the procedure, you should check preload on the flange as well with the axle shafts removed and match the preload with the new seal...

 

I have done the pinion seal replacement on a Sterling 10.5 over a year ago on our company truck and I did not replace the crush collar. I have never replaced one during a pinion seal replacement and have not had any pinion bearing failures. Overtighening the pinion would be the only cause for replacing the crush collar. A loose locking nut on the pinion shaft could back off and cause bearing related failure as would overtightening. Setting proper bearing preload does not mean that the crush collar has to be replaced. I have replaced many pinion seals on many different types of vehicles over the years as a mechanic. You develop a "feel" for this sort of thing. Not something you really can explain in words.

 

Ok so how many ft-lbs of torque do you think should be on the Ford 10.5?