I did a search on BITOG and couldn't find anything using the search feature, so I thought I'd ask.
Ford uses a Power Transfer Unit (PTU) on its AWD vehicles, like the Taurus SHO and Explorer Sport. The owner's manual specifies 75W-140 synthetic gear oil, with a severe duty change interval of 60,000 miles. Doing a Google search will show a lot of frustrated owners with busted PTU's ranging from 20k miles to 60k miles. Some tear down pics show the fluid completely sludged up.
The fill capacity is about 1 quart, and the PTU consists of some bearings and helical cut gears, kind of like a mini differential.
There's no drain plug, only a fill plug at the side of the PTU. I could probably use a suction pump to suck out the old fluid, and then use another pump to pump in new gear oil. I'm used to doing this for filling up the TR-3650 on the Mustang.
What's the best 75W-140 to use for this application? It's not convenient to change every 15k-20k miles, and I'm thinking there has to be a very robust 75W-140 gear oil package somewhere that can handle the stress of this application.
Background: The Taurus SHO has a 6F55 transaxle that uses 12 qt Mercon LV, and a rear differential that is supposed to use roughly 2 qt 80W-90 conventional gear oil according to the owner's manual. The Performance Package equipped SHO and Police Interceptors added an additional (water-to-oil) engine oil cooler, (air-to-oil) trans fluid cooler, and a (water-to-oil) PTU cooler that is integrated into the PTU itself. The non-PP SHO's don't have any of these.
Ford uses a Power Transfer Unit (PTU) on its AWD vehicles, like the Taurus SHO and Explorer Sport. The owner's manual specifies 75W-140 synthetic gear oil, with a severe duty change interval of 60,000 miles. Doing a Google search will show a lot of frustrated owners with busted PTU's ranging from 20k miles to 60k miles. Some tear down pics show the fluid completely sludged up.
The fill capacity is about 1 quart, and the PTU consists of some bearings and helical cut gears, kind of like a mini differential.
There's no drain plug, only a fill plug at the side of the PTU. I could probably use a suction pump to suck out the old fluid, and then use another pump to pump in new gear oil. I'm used to doing this for filling up the TR-3650 on the Mustang.
What's the best 75W-140 to use for this application? It's not convenient to change every 15k-20k miles, and I'm thinking there has to be a very robust 75W-140 gear oil package somewhere that can handle the stress of this application.
Background: The Taurus SHO has a 6F55 transaxle that uses 12 qt Mercon LV, and a rear differential that is supposed to use roughly 2 qt 80W-90 conventional gear oil according to the owner's manual. The Performance Package equipped SHO and Police Interceptors added an additional (water-to-oil) engine oil cooler, (air-to-oil) trans fluid cooler, and a (water-to-oil) PTU cooler that is integrated into the PTU itself. The non-PP SHO's don't have any of these.
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