destroyer1362
A work in progress
The truck is a 04 Denali 4l65e 111k miles
Bought the truck with 102k mi last summer after about 3k mi the truck would not shift out of first until I took my foot off the gas. It only did this that one time. About 2k mi later during normal acceleration it would go from first to second with no problem but about 2 seconds after going into second it would go back to first then back to second. I ended up having a tranny fluid leak. (cracked line to trans cooler hose, ended up draining the trans to the bottom of the dip stick) got it fixed, problem went away. If you are keeping track close to 108k the tranny did it again this time it did not want to upshift and once it did it would do the 1st to 2nd, 1st 2nd thing again. Took it to the same shop who fixed the leak earlier. They found no problem w/ line pressure, no codes or anything. When the shop drove it around they could not get it to shift weird like it was with me at all. Now yesterday it was doing the 1, 2, 1, 2 shift again, woke up this morning and drove it around.. Back to shifting normal again. I never tow with the truck, and it never does anything I would consider to be a hard shift.
One thing I did notice though. I checked the tranny fluid and it is a good amount darker than my other vehicles I'll post a pic in a little..
So.. anybody ever had a similar issue? bc I'm stumped..
Bought the truck with 102k mi last summer after about 3k mi the truck would not shift out of first until I took my foot off the gas. It only did this that one time. About 2k mi later during normal acceleration it would go from first to second with no problem but about 2 seconds after going into second it would go back to first then back to second. I ended up having a tranny fluid leak. (cracked line to trans cooler hose, ended up draining the trans to the bottom of the dip stick) got it fixed, problem went away. If you are keeping track close to 108k the tranny did it again this time it did not want to upshift and once it did it would do the 1st to 2nd, 1st 2nd thing again. Took it to the same shop who fixed the leak earlier. They found no problem w/ line pressure, no codes or anything. When the shop drove it around they could not get it to shift weird like it was with me at all. Now yesterday it was doing the 1, 2, 1, 2 shift again, woke up this morning and drove it around.. Back to shifting normal again. I never tow with the truck, and it never does anything I would consider to be a hard shift.
One thing I did notice though. I checked the tranny fluid and it is a good amount darker than my other vehicles I'll post a pic in a little..
So.. anybody ever had a similar issue? bc I'm stumped..
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