Say first around 30 mph it gets mushy then it will shift up, but when you are trying to pass on the interstate - you push the accelerator, it kicks up to 3rd gear but will not shift up to 4 or 5th until you let off the gas. then it will shift to both gears. i have no power after 70 mph due to this issue.
SOURCE: Loss of Power at Freeway Speeds
Sounds like itr is not getting enough fuel. Try or check the fuel filter for dirt or water, and also check the fuel pump pressure to see if it meet factory specs.
Good Luck Jerry
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SOURCE: 2000 GMC Jimmy's RPM's too high when shifting
replace the moduler valve on the tranny, its about $45 good luck keith...
SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!
Sam,
I would start with a transmission fliud and filter service.
I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.
Good Luck
Testimonial: "Thanks alot richtko94'! I'll try that!"
SOURCE: 4l60e no forward or reverse gears operating
It sounds like your torque converter or the pump is broken.
SOURCE: Tranmission will not shift into next gear from
Try changing the transmission fluid and transmission fluid filter. It is a fairly easy but kind of messy job. Just buy the new fluid and filter, Grab your metric socket set and go at it. NEVER WORK UNDERNEATH A HOT VEHICLE. You have to pull the transmission pan to do this job. When you break the gasket seal several quarts (liters) of transmission fluid will cascade down on you. Be ready for it. Don't forget that when it stops draining there is still a lot of fluid left in the pan. When you finish cleaning up the fluid clean the gunk out of the pan. Install the new filter and reinstall the pan with a new gasket. Do not over torque the pan or filter bolts. If you strip them out or break them off you will need professional help to repair it. Refill the transmission with fluid. It should take six or seven liters.
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