Wonder why the trans won't go to 4th with the 5.9 pcm?

 

What year is the PCM for?

 

Pcm was out of a 98

 

That's why. Sensors in the trans changed in 2000. The PCM is getting wrong info, so, no O/D for you.

 

So then if I get a correct year pcm for a 5.9 1500 it should work good for me then?

 

Yup..

 

K good to know. I'll call the wrecking yard today and find a good used one. After installing the proper vin the abs and airbag lights were still on. Could be from the no bus message/wrong year pcm I imagine?

 

Probably so.

 

Awesome. Thanks for the knowledge and info. Much appreciated. I'll post a follow up whenever I can get another pcm located

 

K so I just got a used pcm into the truck and everything is working as it should! Thanks sooooo much for the help. The only issue I'm left with now is every once in a while the engine will "chug". It only ever does it once and only every 5 minutes or so and only lasts for half a second. It's been there since I swapped the engine. Any ideas? I'm thinking crank sensor or possibly distributor pickup. Is it true that these trucks do not like aftermarket crank sensors? Cuz i had to replace mine with a napa sensor. Thx.