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Old 01-21-2008, 05:57 PM
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Problem, or is it normal?

Still new to the diesel world, and just asking a question that I already asked my mechanic, but it's still annoying, and I want your guys opinion.

While on cruise control, on the i-state, when I come to the top of a hill, and I start going over, my truck jerks a bit when transitioning from accel to maintaining speed, and decreasing speed to go downhill. It also does it when on a flat straightaway when it doesn't know what to do. My mechanic said it was just the TC engaging and dis-engaging. He said either that, or the tranny is going. But if it was the TC, he said it was a good thing. Btw, it doesn't do it just on cruise control, but it was the easiest way to describe it.

What say you???
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Old 01-21-2008, 06:11 PM
duct tape & zip ties

 

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I say you need to have a shop scan for codes. Especially for transmission codes. You can not use a regular code scanner for this. You will need a scanner that is programmed for the transmission.
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Old 01-22-2008, 02:50 AM
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Mornin 4 me. I was hoping for a cheaper answer than the tranny.
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Old 01-22-2008, 06:25 AM
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I would recommend you set aside the mechanics diagnosis for a moment. It sounds as though you may have some play in your drive train.
The most probable cause of play is one or more bearings in your ujoints. If this is the case ,you will feel it and hear it best when transitioning from forward to reverse or vise versa while keeping your foot on the brake .A helper that you trust can enable you to look underneath while doing this.
Use chocks if you are skeptical of the helper......
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