Well, I don't know how many times I've brought this up, I just can't seem to mitigate the problem. It's driving me nuts. My truck just will not downshift out of overdrive when going up a hill or steep grade on its own when in cruise control. I have to give it a little more gas and it will downshift. When I engage cruise control, she doesn't get up and go like other vehicles. Just barely pulls. On level roads, it'll hold 70 mph just fine, except going uphill or pulling a trailer. I've visually checked my vacuum hoses, and I don't see a leak, but I haven't checked with a gauge. I checked some of the other cables and they have a alight amount of slack, but doesn't seem like enough to cause the issue. My transmission was also rebuilt about 15,000 miles ago. Thanks for any help.

 

What kind of things have you already tried to fix your problem?

 

Wow, I wrote all that and forgot to say that all the problems are when its in cruise control. It won't downshift out of overdrive when in cruise control. Things I've done to try and help the problem is removing some of the slack in all the cables, adjusting my TV cable, checking fluid, adding Lucas to fluid, checked all of the vacuum hoses and the cruise control unit.

 

"adding Lucas to fluid"


i have only hear bad thing about that in chrysler's dont how why

sorry that i didnt help with out problem

 

Does it downshift normally if you are NOT using cruise?

 

Yes, it does. Truck runs and shifts perfect under normal conditions, just until cruise is activated...

 

Maybe you have a very small leak in the vac line or CC module under the battery. The leak may be small enough to allow CC to engage, but not let it fully operate correctly.

 

What's the best way to check for that? Gauge? Is there a leak dye? Or just replace the hoses or the module?

 

Usually just inspecting the hose and module by eye is good enough. But a vac pump would help for sure.

 

If your tranny was rebuilt 15000 miles ago, can't you just take it back to the shop that rebuilt it?