06 dodge 2500 transmission help

[mcswain1]

I got.a 06 2500 auto. When u put it in drive it starts pulling ideling up u have to hold the brakes pretty hard to hold it when u put it in neutral it revs up my assumption is the torque converter so I took it to the transmission shop and the recommended the transmission be rebuilt so they did at the time the ecm was acting up when I got the truck back it was still pulling and ideling up so u took it back and he blamed it on the engine he said there's nothing wrong with the transmission. So I replaced the computer on truck and it fixed all problems with the truck shutting off and dash lights but it's still pulling. Is there anything else I need to look at engine wise or is my transmission man trying pull one over on me any help would be appreciated thanks

 

[cerberusiam]

If it is idling up and pulling thru the brakes it is a trans problem. The engine sets an idle speed and reacts to load, it is not the ECU.

There are 2 issues that can cause this and if they don't pay attention building it will be missed. The normal issue is the sprag clutch in the TC stator is not releasing. A new TC should fix that unless thye recylcled your old one and did not replace it.

The second place you will get issues is the pump cover will warp and allow pressure into leak into the TCC apply circuit causing the same issues. If they did examine the pump carefully and check for warping the problem will still exist.

Your trans guy is trying to pull a fast one no matter what he did\did not do becasue he should KNOW better than that. If you replaced the ECU and it is still doing the pull at stop they need to fix the trans correctly. As you can see there can be other issues that an ECU will fix but it will never fix the problem you describe.

Good luck with the trans shop.

 

[mcswain1]

Thanks alot sir. When I hold the breaks it will not kill the engine it Jst loads up like Ur trying to power break

 

[rscurtis]

The normal issue is the sprag clutch in the TC stator is not releasing.

I would disagree. When idling in gear, the sprag is locked to keep the stator from rotating with the pump (rear section of the TC). The turbine is also stationary, as the truck isn't moving. A jammed sprag clutch will make the truck feel like it's always going uphill, as it won't allow the stator to freewheel when the pump and turbine approach the same speed.

 

[cerberusiam]

The stator hub is splined to the input shaft, the sprag clutch is the interface between the stator and hub. Under about 30 mph this clutch needs to allow free wheeling or you have a no stall converter. Once the stator and turbine approach equal speed the clutch locks the stator to the hub to drive the input shaft and the TQ multiplication takes over. With the stator locked or partially locked, it is contantly trying to match stator speed to the turbine and the TQ multiplication is working on the back side of the stator causing it to pull against the brakes.

The same effect happens when the stall speed is set too low with the design of the stator. The more the fluid flow tries to accelerate the stator to turbine speed the more pull. The closer those two components match in speed the more fluid is redirected to TQ multiplication enhancing the pull effect.