The speedometer going crazy and shifting in and out of overdrive almost constantly
SOURCE: My 99 Silverado 1500 won't shift into overdrive
There is an overdrive fuse in the fuse compartment on the drivers side door panel, check and see if its blown, if it is there was some problems with the overdrive shift wire touches the bottom of the tranny pan, and can cause the fuse to blow out.
SOURCE: 2003 chevy silverado will not shift into drive or overdrive.
transmission shift solenoid is stuck open this is a common vehicle issue in automatics and not particular to any make or model vehicle 15 dollar part and arm and leg for labor if taken in
heres an idea to try
take out the transmission filter and replace with new one make sure to take not of any metal debry in trans pan this indicates the trans had sheered its gears down and a trans rebuild is needed
the transfilter needs to be changed at a certain milage interval they can get clogged up
there is a kit you buy for your truck at any parts store
its an easy change hour of time unbolt trans pan unbolt trans filter and put new one in
kit comes with new seals less than an hour you can do it yourself
to overdrive you would feel a difference in shift badley if it was that something to keep in mind
SOURCE: 2001 impala will not shift into overdrive
your overdrive clutch hub has gone out/worn out.
It can be replaced or you could have the whole transmission re-built or replaced with a low mileage one from the salvage yard , etc at a lower cost..(which is what I did)
This is common on these trannys.
SOURCE: 1997 Chevy 1500 P/U 4x4 small V8. Transmission shifting issue.
you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps
SOURCE: 2001 chevy express van 1500,
Inside the van, all the way to the rear, on the side, will have a nice looking panel over it, remove panel and you'll see blower motor, held on with about 6 small screw's.
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