I have a 2002 superduty f250 7.3 4x4 and into reverse or drive from a stop with light throttle there is a whine/squeal, I was told by a trans shop that this is the torque converter and a common problem and that I should replace the converter with a billet one, also when the trans shifts at approx 42mph it flares up or allows the engine to rev up a bit before the shift happens, yet at the shift just before at approx 35mph or any of the other shifts they are firm without any slippage, any help, opinions, past experience would be greatly appreciated. This is a new trans with a rebuilt converter and has less than 200 miles on it.

 

I think your TC has something to do with it. Not sure about the squeal, but when the engine revs up before a shift, it's probably the TC unlocking, and then shifting. Mine used to do that too, from 3rd to 4th gear, same as yours. I took it to the dealer and they reprogrammed the computer for the transmission, made a big difference in how it shifted after that. Go talk to your dealer and see what they say.

 

Although this is for an 02, sounds like it applies:


TSB (02-24-4)
Here is the issue posted in the TSB:

Some 2002 MY 7.3L DIT F-Super Duty, Econoline and Excursions may exhibit the occurrence of P0340 Camshaft Position Sensor false DTC. F-Super Duty and Excursion may exhibit a late 4R100 3-4 shift (hanging in 3rd) at light throttle due to potential lack of converter lock-up occurring after 2-3 shift (most prevalent on 3.73:1 axle ratio vehicles ). This may be caused by the PCM Calibration.

Solution says to reprogram the PCM to the latest level.