Is this tranny issue fixable?

Asked by Jul 31, 2016 at 04:48 PM about the 2005 Chevrolet Astro 2WD

Question type: Maintenance & Repair

i have a 2005 4.3L astro and it started having shifting issues about a year ago-
would fail to shift out of 2nd gear, or when I was driving on the highway at
65mph, it would suddenly downshift to 2nd. Initially I thought it was slipping
and tranny would have to be rebuilt. It has too many miles on it for me to
rebuild the tranny. I found a guy that helped me, replaced shift solenoids and it
ran great, for awhile... started happening again about 6 mos later. I noticed that
it seems to be worse when weather is hot outside, and thru the winter I had no
trouble with it. as the temps rose, it started acting up again, this time I took it
to a tranny shop. turns out the solenoids were good, but the connector to shift
solenoid had issues. the shop cleaned them, and that lasted for 3-4 mos.

These days I can drive to work in the morning and back home again at the end
of the day with absolutely no problem, but if I have to make a 20 run for parts,
tranny will start acting up, as if I can only drive for 1 1/2 to 2 hours each day in
moderate 70 degree weather before I have trouble. I am about to drop the pan
again to clean solenoid connectors, but wanted to see if anyone else has this
issue or knows how to resolve. thanks

1 Answer

70,965

I'd think that if it were a solenoid connection issue the check engine light would come on. If it is on, have the computer scanned for trouble codes. Most auto parts stores will do it for free. These GM shift solenoids tend to be troublesome. But they should be throwing a check engine light and trouble code(s). HTH. -Jim

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