Sputtering in drive: 2001 Ford Ranger V6 3.0 Automatic Transmission

TannerR
Fri, 01 Aug 2025 21:06:30 +0000
Maintenance/Repairs

I recently acquired a 2001 Ford Ranger and put a 3.0 V6 Engine (not transmission) from a 2006 Ranger in it. Once everything was plugged up, i replaced the air filter, fuel pump, coil pack, plugs, plug wires, battery, fuel, transmission fluid, oil filter, and oil. The truck starts up and idles perfectly, the only issue is when it’s put in drive it sputters and hesitates to drive. Brought it to a mechanic who read 4 codes for O2 Sensors and codes for literally every solenoid. He jacked it up and attempted to see if it was struggling to shift into first and it was, but when in second it accelerates perfectly. I decided to change every solenoid (i had new ones already so why not) and now the truck only idles and goes in reverse, no drive function at all. I was also told to change the CKP sensor to the original 2001 one and this did not solve the issue. Any advice would help, i believe maybe the wiring to my transmission may be pushing low voltage or possibly something with the valve body?

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