75-140 VS 80-90w
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Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
75-140 VS 80-90w
So my mechanic has rebuilt my rearend in my truck twice in the last 10 months and now the outer wheel bearings are making a terrible racket. He has been fiiling the rearend with 80-90w I called him on it on the first rebuild telling him it's suppose to have 75-140 thats what the tag says. He proceeds to tell me to throw that tag away because 80-90w is better for it. The 80-90w he is using is synthetic. So the question is does it matter what he uses and if so could it be the cause of the problems?
Postmaster
Joined: Jan 2012
Posts: 2,693
Likes: 3
From: West of Chicago
Ford spends lots of time and money investigating fluids and their effect on wear parts. You need to find a new mechanic. The manual says 75-140 syn that's what the manual says. I don't think he knows what he's talking about. I had my rear bearings done at 275,000 miles, they were the original maintained with the correct fluid. Yes it will harm the bearings etc. is he charging you every time?
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
I figure the 75w140 was speced for reason and a lot of testing was done to come to that reason. Unless he can come up with a Ford TSB I would tell him to put in the required 75w140. If he was so good and such a genius maybe he would not be redoing his work so frequently. Dana specs 75/80w90 in their diffs. It sounds to me like he stocks 80w90 and that is what he wants to use regardless.
It would be nice to just stock the same gear oil for front and rear however I put in the required weight for each axle and stock both oils.
It would be nice to just stock the same gear oil for front and rear however I put in the required weight for each axle and stock both oils.
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Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
The first time he rebuilt it he charged me $900.00 It went about 6 months and the Pinion bearings failed, He says he didnt replace them the first time and charged me another $480.00 to do the pinion bearings and seals now the outer wheel bearings that he did replace the first time have failed but unless he does them for free I will take it somewhere else.
Postmaster
Joined: Jan 2012
Posts: 2,693
Likes: 3
From: West of Chicago
The first time he rebuilt it he charged me $900.00 It went about 6 months and the Pinion bearings failed, He says he didnt replace them the first time and charged me another $480.00 to do the pinion bearings and seals now the outer wheel bearings that he did replace the first time have failed but unless he does them for free I will take it somewhere else.
I would honestly just take it to a new shop unless he replaces everything for free and adds the correct oil. Personally I wouldn't give the shop another chance after all that money and time.
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Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
Hey Kdr , I took no offense to it , you are 100 percent correct. I will be having a chat with him tomorrow and will keep ya posted. I am not a gear lube specialist so it will be hard to argue with him that the difference in fluid caused the issues we are having.
, you are 100 percent correct. I will be having a chat with him tomorrow and will keep ya posted. I am not a gear lube specialist so it will be hard to argue with him that the difference in fluid caused the issues we are having.
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From: Stephensville WI
So my mechanic has rebuilt my rearend in my truck twice in the last 10 months and now the outer wheel bearings are making a terrible racket. He has been fiiling the rearend with 80-90w I called him on it on the first rebuild telling him it's suppose to have 75-140 thats what the tag says. He proceeds to tell me to throw that tag away because 80-90w is better for it. The 80-90w he is using is synthetic. So the question is does it matter what he uses and if so could it be the cause of the problems?
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Not being a lawyer I cannot offer legal advice, and legal discussions are not allowed here in this section, however, if I were you, I wouldnt be paying to have it rebuilt again. As far as I am concerned he is responsible to fix your current problem, AND pay for your last rebuild. He knowingly violated factory specs and it caused problems.
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