Fast Shifting Transmission
#1
Fast Shifting Transmission
I recently put in a engine in a bank repo I bought. A 3800 ,vin k. When you fully accelerate to the floor,the engine will not even make it to 3000 RPM before upshifting. Also cruising at 60 ,if I accelerate to the floor it will not downshift. Not being able to drive it with the bad motor,I do not know if it was like that before or if it was something we did. Any ideas ?
#3
I loaned my scan tool out a while back and was returned broken so I am unable to. The fluid is clean,red and not burnt. The transmission works fine if manually shifted.I will probaly have to find a scan tool to see what is going on.
#7
Senior Member
True Car Nut
Originally Posted by J Wikoff
You might also check any linkage between the throttle body and tranny, for binding or looseness.
good point, something may have got yanked when the engine was being swapped.
#8
DINOSAURUS BOOSTUS
Expert Gearhead
The TV cable isn't on all cars guys. Please think about the driveline you are discussing.
The 4T60 and 4T65 would be the models of transmission being discussed by this poster, not the TH440
Some things to look into.
Gear ratio
Was the trans from the same year
While some yards show them as compabile in certain cases we have found crossing years/gear ratios to cause silimar issues.
The 4T60 and 4T65 would be the models of transmission being discussed by this poster, not the TH440
Some things to look into.
Gear ratio
Was the trans from the same year
While some yards show them as compabile in certain cases we have found crossing years/gear ratios to cause silimar issues.
#9
Finally got my hands on a scan tool. It came up with 3 codes 112,122,123. First one is IAT. Next 2 are for the TPS. Do you think either would have anything to do with the shifting problem. Occasionally it will idle suddenly to about 2500 rpms and then it will slowly go back to normal also it will occasionally fall flat on its face ,have no power, and a few seconds later it would be fine again.