So I am trying to see if I did something wrong. I had a transmission leak so I dropped my tranny and did a few things to address it and hopefully extend the life of my tranny in a 2004 f150 heritage with 4.2 V6. I replaced the tranny pan with a new pan and replaced filter. Upgraded the cooler lines due to crimping the factory line. Replaced the tranny oil pump. Redid the output shaft seal. Replaced torque converter. Here is things seem to have gone wrong. Put back together and now slipping gears, no power, different sounding, and overdrive is not working.

I went back and looked at my notes and this is where I question a purchase. When I bought the torque converter I told them my tranny was a 4r70 aod. Looking back at my notes the tranny is actually a 4l3p. Bolts lined up and did not notice any issues with it sitting correctly. The torque converter was rebuilt so my first thought was I got a bad one.

I'm an amateur I know so any help on thoughts would be so appreciated.

 

A 4l3p transmission refers to a specific 4R70W automatic transmission used in certain 2004 Ford F-150 Heritage models, particularly with the 4.2L or 4.6L engine, often indicated by a part number suffix like "AA," "BA," "CA," or "DA". These transmissions are not interchangeable with other 4R70W or 4R75E transmissions due to differences in gear ratios, electronics, and sensor components, so it is crucial to match the exact original part number or consult a professional to ensure correct fitment and avoid operational problems.