Truck (trans) vibration at high RPMs and Error Code 150
 

I have a 2 part question/issue that I need help with.

Part 1:
I had an engine swap done from a 4.6 to a 5.4 and since the swap, at high RPM's, my transmission vibrates before shifting. It didn't do this prior to the swap so I'm wondering if its a tune issue or something else. Bill wrote a 5.4 stock tune for it so I'm wondering if something got messed up along the way or something needs adjusting.

Part 2:
I received Error Code 150 after attempting to install my custom tune and Bill was able to get me back up and running. However, he told me not to attempt to install it again until he found out what was causing this issue but I haven't heard back from him and that was weeks ago. I've attempted to PM him but I guess he's extremely busy. Does anyone have any ideas on this?

Thanks for any help.

'02 4.6 to '03 5.4 swap!

Robby - As I see it, there are SO many ways the mechanic could have screwed up something when he did your swap. Personally, I would NOT be trying to put a "tune" on it until you get it running properly at stock. You don't need the confusion that interaction of variables from multiple different sources is going to cause.

Try to eliminate as many variables as possible. Take one thing at a time and fix it. Once the truck acts properly under all driving conditions, then, consider adding the complication of a tune. The tune will not fix some underlying problem in the basic setup.

- Jack

There have been 2 good mechanics tell me that since these transmissions are electronically controlled that the issue could be in the tune. Since Bill wrote the stock tune for the truck to be a 5.4, could it be possible that something in the tune could be off? Maybe a difference in the 4r70w vs 4r100 part of the tune?

The tune COULD be at fault, that's why you need to eliminate/isolate the probable cause. If you drive your truck at stock, and the problem persists, you know it's not the tune, and it's something you will have to get fixed.

But, if the problem disappears with no tune installed and surfaces only with a tune, then it IS the tune and Bill will have to work some magic.

Again though, a tune will not "fix" a malfunctioning truck. And, asking Bill to change his tune if the truck is at fault is likely to make the problem worse or even damage the transmission.

Please don't waste your time looking for the "easy way out". You've got to focus on the cause, not the symptoms.

- Jack