Wrecker towing & driveshaft disconnect
Good Sam dispatched a tow truck to tow my 31' Class C 2003 Ford E450 6.8L V10 (4R100 transmission) to my mechanic. The fuel pump had died while sitting in my driveway for a couple of months. When my m...
Forum Discussion
Our 2005 E450 chassis has the Ford 5R110W 5/6-speed computer controlled transmission in it with a TOW/HAUL mode in which (with this mode engaged) the transmission automatically downshifts for you when going down hill.
When doing this downshifting, the vehicle's rear drive wheels are of course at times forcing relatively high transmission and engine spin speeds - driven from the "wrong end" of the transmission -> from the driveshaft end instead of the engine end. I assume the transmission is getting great fluid flows during these times due to everything spinning well inside the transmission.
Can some explain to me why "towing" an RV with this type of transmission - that is designed to also supply heavy downhill vehicle braking for long runs - can get ruined from being towed with all tires down ... especially when the transmission is in neutral while being towed??
I can understand problems with earlier transmissions that aren't designed to provide extensive downhill vehicle braking .... but why is there any concern with transmissions designed to provide automatic downhill braking?
When doing this downshifting, the vehicle's rear drive wheels are of course at times forcing relatively high transmission and engine spin speeds - driven from the "wrong end" of the transmission -> from the driveshaft end instead of the engine end. I assume the transmission is getting great fluid flows during these times due to everything spinning well inside the transmission.
Can some explain to me why "towing" an RV with this type of transmission - that is designed to also supply heavy downhill vehicle braking for long runs - can get ruined from being towed with all tires down ... especially when the transmission is in neutral while being towed??
I can understand problems with earlier transmissions that aren't designed to provide extensive downhill vehicle braking .... but why is there any concern with transmissions designed to provide automatic downhill braking?
