i have a 2004 ford f150 new body style with the 5.4 liter 3 valve motor. i recently had a guy build my transmission to make it shift harder and he put a new torque converter in as well. it does not seem to run as well. does anybody know the stall rate of a stock converter or whether there is more than one converter for that motor.

 

Stock TC stall speed for an 04 with a 5.4 should be between 2350 and 2775 RPM per the TC diagnostic test procedure.

Aftermarket converters can be produced with a wide variety of stall speeds. You will need to ask the shop what they installed.

This can mean many different things. Perhaps you should elaborate on what specifically is different and undesirable.

Steve

 

Sounds like they put the lower stall converter in to me. There are basically 3 truck converters. The 4.2 got the highest stall to make up for it's lack of torque. On a decent engine they will stall 2000-2200 on average. The 4.6 got the standard converter which will stall 1800-2000 on average. The 5.4's are a variable some get the 4.6 converter and others get the lowest stall which will stall 1500-1800. You can externally see the difference in the lowest stall and the other 2.
Alan

 

I have 60,000 miles on my truck and the transmission went out due to a falult valve that stuck shut and did not allow proper flow of transmission fluid. The friend of mine that has owned a transmission shop for about 30 years rebuilt my transmission( they rebuilt in with stronger internal parts and put a shift kit in it with different valves and an upgraded pump). The transmission shifts excellent, hard and quick with no lag at all. The problem that i seem to notice is from bottom end. From a dead stop it seems so sluggish of the line, like it has a lower stall stock converter than it originally had before the transmission went out. I'll put it this way, at 60,000 miles i am on my 4th set of tires because i continue to do stand still burnouts and now the truck wont even turn the tires over at full throttle( while break torqueing). From a dead stop it just feels so slow and i don't know why. Do you know anything else that would cause these results besides a low stall tc.

 

Brake torque it and see what your stall speed is.

Steve

 

The wheels start to spin over right around 1800 rpms. That is why i think i lower stall converter was put in. Now i know there is stall where the wheels start to turn and stall when the actuall engine stalls. Which am i looking for, for the 2300 to 2700 stall.

 

Brake stall and flash stall won't be the same.
Flash stall is doing WOT without braking. It ususally is a bit higher.