2000 Chevy Silverado......tranny problem....help!

Hank:

I place my bet on the 1-2 shift solenoid or the 3-4 shift solenoid OR BOTH of them. They are known to go bad after some peroid of time and I've issued a bunch of them to technicians. Thermal runaway is the culprit. After the solenoids reach operating temperature, the wire coil in the solenoid shorts out and causes the solenoid to engage even though it shouldn't. (My best guess).

If you're gonna try to fix it yourself, this is the least expensive parts replacement that you can try. Be sure to change the filter while you're there since you'll need to R & R the pan to replace the solenoid(s).

Both the 1-2 and 3-4 solenoids are the same part number so you could just buy one and try it in the 1-2 spot first and then remove the pan a second time if a test drive determines the problem still isn't fixed.

Good Luck!

I might be wrong, but there might be a TSB on that trouble. I heard on our local " Car Care ' radio program, that a overpressure relay, goes nuts, and resets when you shut off and restart. I think its inside the vavle assembly, and you have to drop the pan to get at it. I might even be on a different vehicle, but its only my two cents worth! .

I might be wrong, but there might be a TSB on that trouble. I heard on our local " Car Care ' radio program, that a overpressure relay, goes nuts, and resets when you shut off and restart. I think its inside the vavle assembly, and you have to drop the pan to get at it. I might even be on a different vehicle, but its only my two cents worth! .

I found the link below, but it doesn't describe exactly what the OP is complaining about, but it's close

To All,

Thanks for the advice and link. I think I am going to change the fluid/ filter, modulator valve and the shift solenoids. I'll let you know how it turns out at a later date.

Hank

| >> I might be wrong, but there might be a TSB on that trouble. I heard on | >> our local " Car ?Care ' radio program, | >> that a overpressure relay, goes nuts, and resets when you shut off and | >> restart. ?I think its inside the vavle assembly, and you | >> have to drop the pan to get at it. I might even be on a different | >> vehicle, but its only my two cents worth! ?. | >>

| >> I found the link below, but it doesn't describe exactly what the OP is | >> complaining about, but it's close | >>

| >>

| >> -- | >> Steve Spence | >

| >

| >

| > To All, | >

| > Thanks for the advice and link. I think I am going to change the fluid/ | > filter, modulator valve and the shift solenoids. I'll let you know how | > it turns out at a later date. | >

| > Hank

There is another TSB I see frequently about a loss of power to the instrument cluster and transmission. Shift solenoids can usually be checked with an ohm meter.

nobody #1