Torque converter does not unlock-update #2 8-25

Today I was going to take the truck in and it seemed mostly back to normal. So I circled around for a 20 mile test drive and headed back to storage. As I was returning I noticed the OD light is flashing. I am sure that is bad but seems to be shifting fine.

I did have a bad alternator in Gillette WY about the time this started. Could it be a low voltage issue? Transmission computer seems to have mostly relearned how to shift.

Any thoughts?

I can tell you this, when the trans shop told me I needed to replace the converter in my Ram I blew them off. Less then six months later I was having the whole trans rebuilt and a new converter. They told me had I just replaced the converter before the trans would have been fine.

Don't wait to have it looked at but with 185,000 miles I'm betting your going to need a total rebuild.

Good luck Don

If parked and I move the selector to 2 the engine will stall. sequence P-R-N-D-2-1
When slowing in D to a stop it will nearly stall before it gets to low gear.
Usually it would lock in 2-3-4 once it was done shifting to smooth things out. Now the shift is very abrupt/harsh with the TC locked. Especially the downshifts.

Fluid was changed 5k ago with the same Mobil 1 synthetic.

Driven over 3,000 miles with no engine light the past three weeks pulling the trailer from CA to SD and back.

Too hot today upon return to check all connectors etc. Thanks for the tips. Anything to add is appreciated :)

2001 5.4 F150 4wd

Not sure about yours, but my Allison 3060 remains unlocked until halfway thru 2nd. It stays locked until returning back to 2nd halfway. Sounds normal to me.

Jim

Have you checked the transmission fluid lately? Low fluid levels are one cause of this behavior that is pretty cheap to fix. Be sure you check it the right way, don't just go out and pull the dipstick and expect to learn anything useful.

Any work done under the hood lately? Mine short shifts and shifts very firm if I forget to plug the MAF sensor back in after doing work (and it won't even turn on the check engine light until the next drive). BTW my 4R100 normally locks in those gears.

Is this an acute problem, or has the shifting progressively been getting worse?