Shifting problems

LLYD_MAX

New member
May 22, 2010
92
0
0
Myrtle Beach S.C.
im having some problems with one of our other trucks. Its not the one in my sig, is a bone stock LMM with about 80k miles.

I was driving it today and i noticed when i came to a stop about 2-5 seconds after coming to a stop the truck would jump foward a little bit and i would feel a bump from the trans. I drove it around some more thinking it was just a freak thing but it keeps doing it.

It shifts fine through all the gears up/down except when it downshifts to first and comes to a stop. Its like the converter or somthing is not unlocking when i come to a stop.

even if i crank the truck up in neutral about 4 seconds after starting it you can feel somthing in the trans kinda bump or engauge. I tried logging some data with the scantool but i didnt know what PID's to select and i was having trouble connecting to the TCM.

I reset TAPS and drove it around for about 20 miles and it still does it. Is it the converter or a solenoid, valve sticking? I changed the fluid about 30k miles ago. sorry for the long post fellows, and any help or advice would be greatly appreciated.
 

blackdirtymax

New member
Apr 15, 2010
825
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0
augusta, ga
im having some problems with one of our other trucks. Its not the one in my sig, is a bone stock LMM with about 80k miles.

I was driving it today and i noticed when i came to a stop about 2-5 seconds after coming to a stop the truck would jump foward a little bit and i would feel a bump from the trans. I drove it around some more thinking it was just a freak thing but it keeps doing it.

It shifts fine through all the gears up/down except when it downshifts to first and comes to a stop. Its like the converter or somthing is not unlocking when i come to a stop.

even if i crank the truck up in neutral about 4 seconds after starting it you can feel somthing in the trans kinda bump or engauge. I tried logging some data with the scantool but i didnt know what PID's to select and i was having trouble connecting to the TCM.

I reset TAPS and drove it around for about 20 miles and it still does it. Is it the converter or a solenoid, valve sticking? I changed the fluid about 30k miles ago. sorry for the long post fellows, and any help or advice would be greatly appreciated.

It just needs a built trans that's all , lmao. J/k
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
44
48
44
ZEPHYRHILLS, FL
Does it have a 1 piece driveshaft in it or is there a carriage bearing in the driveshaft? What you describe sounds like the slip yoke splines hanging up.
 

LLYD_MAX

New member
May 22, 2010
92
0
0
Myrtle Beach S.C.
Does it have a 1 piece driveshaft in it or is there a carriage bearing in the driveshaft? What you describe sounds like the slip yoke splines hanging up.

Its got a single piece shaft. I cant figure out whats causing it to shift funny. Im gonna take it to the dealership tomorrow and let them deal with since its still under warranty.


when i was driving it today, it would hang in 1st and not want to up shift.