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4 Wheel Low Issues ?

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3gen Common Rail (Coatings)

transmission service, now low speed surge

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So I was out romping through the back country the other day on a search for an old mine site in the area, to capture some pictures. I had the T case shifted into low range while I was crawling around on the side of this mountain where the mine is located. While decending a hill and coming to a three point turn on this old road I applied the brakes and the torque converter would not unlock. The transmission started to buck, such as did the 2nd gen trucks with auto transmissions and using a mystery switch at low speeds. The only way that I was able to over come the problem was to down shift to 2nd gear, or shift into neutral. Has anyone else experianced problems like this? Is there a fix? Or is this just another quirk with the 3rd gen trucks???
 
Were you still straight when this happened or had you already started the turn?



Mine will buck like you are describing if I'm turning on a surface that doesn't allow the tires to slip a little when locked in 4wd. If you are going straight when this happens then you very well may have a problem.



If the TC stays locked it would stall the motor wouldn't it? Or will the transmission slip/break first?



Duane
 
I was still straight, wasn't the front axle binding. The first time it happened the TC did finally unlock but only once the RPMs got down pretty low and I was standing on the brake peddle with both feet before I went over the edge.
 
Hmmmm. . I suppose it could be a programming problem with 4wd low. Since the gearing is so incredibly low in that range, even at very slow speeds the transmission is likely to be in 3rd or 4th gear. Maybe it got confused when you tried to stop?

Ryan
 
I think theres info in the service manual that when in any 4wd range your torque converter is always unlocked. so you might have a problem.
 
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