Engine/Transmission (1994 - 1998) Friend transmission won't downshift after rebuild

[Mactruck]

Have a friend with a 96 3500 w/a recently rebuilt transmission. (This week)



The shop stated that they are having a problem downshifting the truck. Shifts fine it just won't downshift under a load or gunning it.

They also stated it wasn't receiving a signal to downshift from the injection pump.

Yes I know that the Injection pump is Manually controlled so to me this doesn't make sense.

Could it be a TPS, TSS or a kickdown cable adjustment.



My concern really is that this is a somewhat reputable shop and based on their proposed answer I think they know nothing about CTD's.



On Edit. He had been having a problem with the transmission stalling prior to the rebuild. Stalling at trffic lights and such. To me it sounds like a TPS problem. Comments?

 

[Joe G.]

He had been having a problem with the transmission stalling prior to the rebuild. Stalling at trffic lights and such. To me it sounds like a TPS problem. Comments?

Stalling? Explain please.

 

[tp0d]

If it wont downshift correctly, they have the TV cable adjusted incorrectly. This is not diesel-specific, most gassers have TVs also... (tv==throttle valve) The tv cable is also called a kickdown cable. .

I wouldnt say its a TPS problem, they dont play a huge role in kickdown, as far as I know. .

As for the stalling, it sounds like he had either a lockup solenoid fault, or a wiring problem going to ground that was engaging the lockup converter at the wrong time. That will kill an engine dead at low rpm+speed.

Might want to have them call DTT for some insight.

good luck

-j