The Diesel Garage banner

2003 Super Duty with 24valve cummins

16727 Views 19 Replies 6 Participants Last post by  Saul

2003 Ford F-250 Super Duty Crew cab short bed 4x4. Was a 7.3 truck from the factory.

2001 5.9 24 valve cummins engine

4r100 transmission with electronic t-case

Destroked Billet Flex plate
Destroked 5.9 to 4r100 adapter
PCS trans controller

Its more or less a project not complete.

-It runs and drives but trans does not shift correctly. feels as if motor is hitting a rev limiter when tryin to shift gears.

-the wiring is ummmm wow (see pics). cant believe it runs.

-when in park runs fine at idle and when you rev it up to higher rpm's

However the engine came from auto truck. I've been told to swap to manual ecm or get it flashed at local dodge dealer......well i called dodge today and they said the can only update it to software of auto status.

Although i have located a ecm at a local wrecking yard but seems a bit pricey.

I have a ford FSM for 2003 Ford and working on getting wiring diagrams for 2001 dodge cummins truck.

YIKES! 7.3 harness

Plugs from 5.9 engine harness next red elbow.


another shot of 5.9 engine harness plugs

wires to injection pump (ahhh dude used black wires everywhere!!)

A pic of the truck if it all matters


Do i swap to manual ecm?
Do i swap to manual engine harness as well?
Or What is wrong aside from the wiring mess?

ALL in ALL Steel @ GOS Performance is great help and has earned my business
See less See more
  • Like
Reactions: 1
1 - 3 of 20 Posts

Tell me I'm not the God of PCS tuning on a 4R100?!? LOL
Sweet. Programming issue?
To say the least... The TPS signal wire was hooked up to the 5 volt supply wire rather than the signal wire... first off... so the PCS was always getting a 100% TPS signal. Second, the rear end gear ratio wasn't even programmed, it was blank, and the speedo pulses per mile were at 8000 rather than 2000 so the PCS thought it was going 240+ at an actual 70ish mph. I set Dustin up with a calibration similar to mine. We are going to tweak on it some more, but at least it drives now...
  • Like
Reactions: 1
Awesome! I love to see when this happens. Wanna come fix my Cummins/Allison?
Get it to me!
1 - 3 of 20 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.