Forum Discussion

Lessmore's avatar
Lessmore
Explorer II
Oct 25, 2017

Service intervals...will they increase

New automatic for class 8 , heavy duty trucks called the Eaton Endurant.

I was reading that he oil drain intervals have been stretched out to 750,000 miles for this transmission. I'm impressed. I don't know what the factory recommended diesel engine/ transmission service intervals are for the one ton GM, Ford, Ram trucks...but I don't think any of them approach 3/4 of a million miles for transmission oil drain service.

I realize that Class 8 trucks have more oil capacity/filter ability for their diesel engines, transmissions, but it does make me wonder if the big three one tonners will soon...or ever... approach their larger highway tractor brethren in service intervals.
Tow Vehicles

18 Replies

Show More
  • ShinerBock's avatar
    ShinerBock
    Explorer
    Oct 25, 2017
    I still remember when Eaton first started making these automated transmissions. They just slapped pneumatic controls on their existing manuals instead of making a whole new design specifically for automation. We had at least three to four in our service bays on a daily basis due to x-y shifter failures and exposed electronics/harnesses.

    Hopefully, with a whole new design specifically for automation, these Endurants will not have as many issues.
  • ShinerBock's avatar
    ShinerBock
    Explorer
    Oct 25, 2017
    SidecarFlip wrote:
    Far as I know, only Allison builds a completely automatic Class 6-8 auto and they have to have fluid changes and filters on a regular basis.


    Not any more. The Ford 6R140 is also used in class 6-8 F670/F750 trucks. Most people think that just because the F750 has a 7 in it then it is a class 7 only. However, some variants of the F750 have GVWR's above 33,001 lbs which makes them a class 8 heavy duty truck. Technically it is the only automatic transmission used in light, medium, and heavy duty trucks. Allison makes transmissions for each class, but they are different.
  • stickdog's avatar
    stickdog
    Explorer
    Oct 25, 2017
    ShinerBock wrote:
    The Eaton Endurant is an "automated" transmission, not an "automatic". It still has internal gears and a clutch just like a regular manual transmission and does not have planetary gears, sun gears, bands or drive clutches like an automatic transmission. Instead of manually shifting with a lever, it has what is called a pneumatic x-y shifter on top that is computer controlled to shift for you.


    Thank you for the explanation. Learn something on here once in a while.
  • SidecarFlip's avatar
    SidecarFlip
    Explorer III
    Oct 25, 2017
    Isn't that a servo shift? Far as I know, only Allison builds a completely automatic Class 6-8 auto and they have to have fluid changes and filters on a regular basis.

    750 sound right for a servo shift not for a full auto. A servo shift uses a conventional gear transmission with a servo actuated clutch pack to load and unload the gearbox

    What kills the fluid in an auto is heat and cool cycles. Gear boxes don't have the issue nearly as much.
  • ShinerBock's avatar
    ShinerBock
    Explorer
    Oct 25, 2017
    The Eaton Endurant is an "automated" transmission, not an "automatic". It still has internal gears and a clutch just like a regular manual transmission and does not have planetary gears, sun gears, bands or drive clutches like an automatic transmission. Instead of manually shifting with a lever, it has what is called a pneumatic x-y shifter on top that is computer controlled to shift for you.
  • 2oldman's avatar
    2oldman
    Explorer II
    Oct 25, 2017
    Lessmore wrote:
    I don't know what the factory recommended diesel engine/ transmission service intervals are for the one ton GM, Ford, Ram trucks...but I don't think any of them approach 3/4 of a million miles for transmission oil drain service.
    Uh..no. I doubt anybody keeps one that long. You'd probably go through a couple engines by then.

About Travel Trailer Group

44,049 PostsLatest Activity: Sep 03, 2025