Overdrive stopped working 1998 Monte Carlo LS

[rkvons]

Hi all,

I think I've joined the ranks of the no overdrive in our Monte club. Bought the car last summer, 184K on the odometer. Previous owner was original owner. Said trans was always strong. Took the car for a spin Saturday. Previously, no OD issues. It's cold out. Pulled up to a light to get out onto main road. Right turn on red. accelerated normally, but noticed a long hold in 1st before shifting into second. Never saw it before, so was paying attention at the next light, which was right away. Accelerated again, and again a long hesitation going from 1st to second. Uh oh. Now I'm worried. Next light is right away again. Light turns green, car shifts normally and I drive it about 10 miles. No issues. I paid particular attention to it going into overdrive, and it did. Arrive a junk yard. Got the part I wanted. Spent about an hour in there. Came back out and started home. Car shifted ok, but did not want to go into overdrive. Thought to myself, well, maybe it's cold. Drove some more. Nope. Never wants to go to overdrive anymore. It does shift from 1-2-3-4 ok. I've heard about the stripped spline in the output shaft, but I was wondering if there is another controller somewhere inside, or outside of the trans that could be causing this issue. When I am in OD and in 4 gear and driving at about 50 MPH and I shift it to D, I feel it shift into 3rd. I plan on getting it diagnosed, but was wondering what you all are thinking. Thanks,

[maxwedge]

Internal, the 4th cluctch hub is stripped, common issue.

[rkvons]

Update:

My car issued a code. Misfire on cylinder 2. I have an intermittent problem with my ICM and it showed itself again. But last night on the way home from work, it was smooth and the overdrive was working again. Is it possible that the overdrive will not be engaged if there is a misfire?

[maxwedge]

Possible a severe misfire would prevent engagement, as the tps and engine load would would increase their inputs to the pcm causing the trans not to upshift till very late, maybe in your case, time will tell.