I'm finishing up an engine and transmission swap for a buddy of mine. He wrecked his truck and bought one just like it with a bad engine. Before I pulled the bad engine and the tranny out of the truck, it was showing a P1698 code.
I have the swap basically finished and fired the truck up today. The P1698 code was still there, but I cleared it and it hasn't came back on since. However, I did notice that the gear indicator is flashing every gear sequentially no matter what gear the truck is actually in. I haven't really drove the truck yet because of the brakes, but everything seems fine, it kicks into gear and everything. Thanks for any help as to why the indicator is doing that. It's a 2001 4.7 auto

 

More info. Were they both 01's?

 

The truck that the good engine came out of was a 2000, and I put it in a 2001. they were both 4.7 autos. One had a manual transfer case and one had a power transfer case, but I switched those out and kept the original one in the truck

 

OK. It is likely a problem with either the transmission range sensor (TRS) or more likely, the cable isn't adjusted properly so that the transmission isn't exactly in gear. It will still go into gear even if not "quite right" but should trip a fault code.

Gearshift Adjustment Procedure
(1) Shift transmission into PARK.
(2) Release cable adjuster lock tab (underneath the steering column) to unlock cable.
(3) Raise vehicle.
(4) Disengage the cable eyelet from the transmission manual shift lever.
(5) Verify transmission shift lever is in PARK detent by moving lever fully rearward. Last rearward detent is PARK position.
(6) Verify positive engagement of transmission park lock by attempting to rotate propeller shaft. Shaft will not rotate when park lock is engaged.
(7) Snap the cable eyelet onto the transmission manual shift lever.
(8) Lower vehicle.
(9) Lock shift cable by pressing cable adjuster lock tab upward until it snaps into place.
(10) Check engine starting. Engine should start only in PARK and NEUTRAL

 

Thank you very much for the information, I will try that when I get off of work this evening

 

I went ahead and adjusted the shifter cable with no luck, but here's some more information I've found out

Before I pulled the knocking engine and transmission out, the truck hardly had any power, it took all it had to pull up onto a car dolly. I just assumed it was due to the engine.

But now that I have the good engine and tranny in it, the truck still hardly has any power, the tires are bald, and it wouldn't even spin in two wheel drive in the front yard. I also noticed that when I push the overdrive off button, the light wouldn't light up

 

Is the check engine light on?

 

Also, I went ahead and switched out the transmission control module with the one that went with that transmission with no change. I was going to also switch out the engine control module, but I wasn't sure if it would work due to one truck having a manual transfer case and one truck having an automatic transfer case

 

It was on when I first fired the truck up, and I cleared it and it came back on one more time, and went off on its own and hasn't came back on since

 

There are differences in the PCM between the two years - basically due to a change in bus design from 2 wire (2000) to 1 wire (2001).