erubin2000

2004 Astro, 2WD. Vehicle automatic shifts fine except does not shift 3rd->4th unless i play with the accelerator. Fluid looks perfect, color, smell and level are perfect. Shall I drop the pan and change 1 or more solenoids. No CEL.

mountainmanjoe

How many miles on it?
Solenoids might be a waste of money if the trans is plum wore out.

erubin2000

210k miles. Does anyone have troubleshooting advice? Fluid is in excellent shape and has not had a recent fluid change. Can a solenoid cause just one shift to fail? Is that possible with 2 solenoids controlling 4 gears? Or would a problem with a solenoid prevent two shifts to fail? I only lost 4th. Anything else to check/replace with pan off? Willing to spend $20 on a solenoid, $30 on filter and pan gasket and maybe $35 on trans fluid. Waste 2 hours on my labor. But not if you are sure it can’t be the solenoid

mountainmanjoe

A transmission shop would have to look at it and run some diagnostics to see. But he'll probably says the same thing : it's not worth putting money and time into a transmission with that many miles. Solenoid failures usually throw trouble codes.