Torque converter issue on 95 k2500

[Justyce Comstock]

So I bought the truck and had to put a new torque converter in it. So I did. Brand new and it jerks whenever I go into a gear every so often. Sometimes it does. Sometimes it doesn’t. U-joints are good. Brand new trans mount. Good on tranny fluid. I have no idea what’s going on

 

[RichLo]

maybe the idle is slightly higher when it jerks?

 

[PlayingWithTBI]

maybe the idle is slightly higher when it jerks?

^^^X2 - Or the IAC is opening for "Stall Saver" which will increase idle momentarily as well as other conditions so, it may not be your TC at all? See if your engine stumbles just before you feel the jerk.

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[andy396]

How much metal and junk was in the transmission fluid when you changed the TC? A bad torque converter can sometimes take out other stuff inside the transmission. How many miles are on it?

 

[Justyce Comstock]

How much metal and junk was in the transmission fluid when you changed the TC? A bad torque converter can sometimes take out other stuff inside the transmission. How many miles are on it?

Well the tranny was rebuilt. So everything was good in the tranny but a bolt fell out of the torque converter. It shot it inbetween the engine block and the flex plate and knocked the weight off the flex plate. So we also got a new flex plate. There was no metal shavings that I know of to be seen

 

[andy396]

Well the tranny was rebuilt. So everything was good in the tranny but a bolt fell out of the torque converter. It shot it inbetween the engine block and the flex plate and knocked the weight off the flex plate. So we also got a new flex plate. There was no metal shavings that I know of to be seen

Gotcha, I was thinking it failed internally.

 

[Justyce Comstock]

^^^X2 - Or the IAC is opening for "Stall Saver" which will increase idle momentarily as well as other conditions so, it may not be your TC at all? See if your engine stumbles just before you feel the jerk.

You must be registered for see images attach

The engine doesn’t feel like it’s stalling at all. It just engages right into gear. No hesitation. I let it sit a minute or 2 so it can idle down from start up. It sits around 850-900 and I put it in gear and it jerks. It’s every so often too. Like sometimes I can put it into gear and it won’t jerk

 

[Justyce Comstock]

maybe the idle is slightly higher when it jerks?

850-900 is where it is sometimes. But most of the times it’s around 800

 

[PlayingWithTBI]

But most of the times it’s around 800

Is it a 5.7L? It should be lower than that, closer to 650 w/o AC on.

 

[thinger2]

Whenever a 4l60e starts acting up after an R&R.
Check for electrical problems. Even a bad trans ground can cause all kinds of screwy intermittent problems and the harness and plug going to the trans are pretty common failure points.
I'd start with verifying that the whole run of wiring is good and go from there.
After you check that out then you can start looking at what inputs to the trans but ya gotta be confident in the wiring so you don't get caught up in a circular diagnosis loop of crazy making frustration