Recently had tranny issues, leaking. Replaced the seals/gaskets and got a new torque converter that is a slightly lower stall speed. The newer stall is 2-300rpm lower.

Everything works great except for 1 thing that is annoying.

Before, I could let off the brake, giving no gas, and the truck would just barely move, IE: get going maybe 5mph. But now when I let off the brake, still not giving gas, the truck will get going fast enough to shift into second, maybe 15-20 mph without giving gas.

In neutral the truck idles about 110-1200, stopped in gear, i'm at about 750-800rmps.

The question is, am I idling high or is the "pulling" caused by the new converter?


Thanks!

 

It's idling too high. Sounds like the IAC may be partially stuck open or you have a major vacuum leak.

 

If the idle is a consistant 650 to 700 rpm in hot idle, it is normal.
If it varies on a hot engine, the IAC is sticking open to far.
The basic idle cannot be intentionally altered by any manuel adjusting of the stop screw except to increase it. If that is done the cold start is upset to a degree.
If the stop is lowered to close the throttle plate, the idle may be upset and the plate may stick in the throttle bore when the throttle body cools.
A low stall converter will pull the truck on the level or even up a sleight grade.
The converter stall has tighter fluid coupling between the stator and the turbine elements.
I have a custom low stall conversion based on a diesel unit that has mutiple lockup discs for long life at towing.
Bottom line is the converter should not pull you hard but may/will just enough you see it and may need to use some small amount of foot braking, at times.
Otherwise, the converter you got may be too tight and need to be changed if there is no high idle issue to be solved.
Further, a converter tightness depends on the weight of the vehichle, the gear ratio, towing load, box load etc as to it's sensitivity to 'creep'.
Most often reason for using a low stall converter is to reduce transmission temperature pulling from a stop and during 'out of lock' running.
One small problem with this is the motor usually does not have enough torque off idle until it wind up a bit in RPM and road speed to better get into the motor's fast rise in the torque curve.
With a Diesel, it's not a problem..
Good luck.

 

Warm idle should be within 700-750 rpms or you have a problem. That's neutral, not in gear. 730 is perfect from what I've seen. Yea, that's the first I look at for direction.

 

Your credit score. Haha.

 

Right! Do they go that hi?