75/140w VS 80/90w
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Cargo Master
Joined: Feb 2011
Posts: 3,450
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From: Forest lake minnesota
75/140w VS 80/90w
Ok I know Ford specs out 75/140 synthetic rear axle fluid but a lot of gear companies recommend 80/90w as does a couple of local mechanics in fact one of them says he will never put in the 75/140 and only uses 80/90. What is everyones thought on what fluid to use in a rear axle.
Lead Driver
Joined: Mar 2013
Posts: 7,460
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From: Kent Station, WA
I did 75/140 with modifier from Royal Purple because it was the cheapest I could find. On the front Dana it will be 80/90 as recommended by OE.
I don't see a need to switch weights when something has been recommended by the Manufacturer and never resulted in failure. With that said do not use MerconV in the transfer case.
I don't see a need to switch weights when something has been recommended by the Manufacturer and never resulted in failure. With that said do not use MerconV in the transfer case.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
The covers I have taken off of diffs that specd 75-140 all looked good to me, from gears to bearings. No failures of any kind either. If it is somehow a bad weight to use I am not seeing it.
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Hotshot
Joined: Jul 2013
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its the age old arguement. higher weight provides better shear loads, lower weight provides better cooling. can an axle fail if it has high shear protection and overheats....yes. can an axle fail if it has poor shear protection and runs cooler....yes. do axles fail in general...yes. pick your poision.
Lead Driver
Joined: Nov 2008
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From: South Jersey
Well ford has been using and recommending 75w140 in the rear sterling axle ever since it was introduced and how many do u hear of fail? Maybe a hand few, ive had mud trucks with this axle and ive welded the spider gears together dor a backyard spool for mudding. People swap them into custom mud buggies, rock bouncers etc with nothing more than chaging the out the LS and adding at bigger yoke and they hold up. I'll continue to use 75w140
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Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
Well ford has been using and recommending 75w140 in the rear sterling axle ever since it was introduced and how many do u hear of fail? Maybe a hand few, ive had mud trucks with this axle and ive welded the spider gears together dor a backyard spool for mudding. People swap them into custom mud buggies, rock bouncers etc with nothing more than chaging the out the LS and adding at bigger yoke and they hold up. I'll continue to use 75w140
wont let me post thumbs up by itself....
Hotshot
Joined: Jul 2013
Posts: 14,266
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Well ford has been using and recommending 75w140 in the rear sterling axle ever since it was introduced and how many do u hear of fail? Maybe a hand few, ive had mud trucks with this axle and ive welded the spider gears together dor a backyard spool for mudding. People swap them into custom mud buggies, rock bouncers etc with nothing more than chaging the out the LS and adding at bigger yoke and they hold up. I'll continue to use 75w140
Lead Driver
Joined: Nov 2008
Posts: 8,450
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From: South Jersey
What year 450 does he have? Remember Ford neutered the f450 with a lighter duty rear axle and springs not long back. Unless he has a medium duty f450, but that will have the dana110 or 135? I forget but either one is up to heavy duty work ever day. And hiw many miles is he driving? Does he change the gear oil like he should? My answer is no most likely not. And what kind of cars? He could have mini vans not a small compact car on his trailers with the heaviest vehicle right over the rear axle on the truck which is over loading it causing this so called issue. We have a 2004 F550 2wd dump at work that im in two days week and is used by the bosses son the other days of the week hauling dirt, rock, rubble etc plus towing a backhoe or tracked skid steer with ZERO issues and probably the worst maintence ive ever seen. Oil chages in the nine months ive been here are "check the dipstick and add oil if needed"
Hotshot
Joined: Mar 2007
Posts: 10,101
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From: Pa
Hes probably over weight on the rear axle on a regular basis. A lot of these hot shot car haulers don't monitor their weights, they throw the cars on and go. Frankly if I was hauling cars on a regular basis like that I'd have an F-650 or similar sized truck.
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