The Best Half Ton Towing Truck - Ike Gauntlet
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The ZF 8 speed in the Rams(and in my BMW) have a torque converter so the "would" part of that has no bearing in what is being discussed.
There is some slippage in the torque converter locks up clutches and in the clutch packs of the transmission as they lock together. That is what clutches do, they slip as they come together and then lock up. Even though it is very quick on the ZF 8 speed, it still isn't instantaneous and there is some slippage especially when the TCM programs smooth shifts. There is less slippage in sport modes that have a firmer and quicker shift.
Increasing line pressure for long periods of time under heavy load to keep these clutch packs together causes more friction and will increase the fluid temp. High engine temps will also heat soak into the trans as well. Too much heat will break down the fluid and decrease its ability to keep these clutches together which will cause them to slip. I am not saying that it will likely happen in any of these trucks any time soon, but it will eventually happen as the clutch material over time.
If these 8 speeds didn't have some slip or heat caused by what I stated above, then why is this Ram Rebel's trans temp is at 203F at 31:00 of this video towing just 7k lbs with snow falling?
Ford Raptor vs Ram Rebel on Ike
There is some slippage in the torque converter locks up clutches and in the clutch packs of the transmission as they lock together. That is what clutches do, they slip as they come together and then lock up. Even though it is very quick on the ZF 8 speed, it still isn't instantaneous and there is some slippage especially when the TCM programs smooth shifts. There is less slippage in sport modes that have a firmer and quicker shift.
Increasing line pressure for long periods of time under heavy load to keep these clutch packs together causes more friction and will increase the fluid temp. High engine temps will also heat soak into the trans as well. Too much heat will break down the fluid and decrease its ability to keep these clutches together which will cause them to slip. I am not saying that it will likely happen in any of these trucks any time soon, but it will eventually happen as the clutch material over time.
If these 8 speeds didn't have some slip or heat caused by what I stated above, then why is this Ram Rebel's trans temp is at 203F at 31:00 of this video towing just 7k lbs with snow falling?
Ford Raptor vs Ram Rebel on Ike
