Joel Browning

I just wanted to give an update... After installing the 1L3P into the heritage I found out that they don't interchange. Once I got the truck to 35-45mph the truck would shift to what felt like neutral. I got codes P0720 and P0722, both for the output shaft speed sensor. I looked up the part numbers for the sensors and they were different. I swapped the sensors and that didn't work. I looked at the tone wheel of the 4L3P that I took out and I could visibly see the teeth. The 1L3P has no teeth only drilled holes. So before I pulled the transmission back out I swapped the PCM from the truck I pulled the transmission out from, cut and programmed 2 keys and it fixed the problem. So far there has been issues with the PCM swap.

I had something very unique happen with a new 6.7 Long block. Tried to start it for the first time and let it crank for a long time. While it's cranking it's very uneven and tried to start several times. No codes popped up. Checked to make sure I was getting fuel and my pressure was good. I ran a relative compression test and found cylinder 5=16%, 6=10%, 7=16%, 8=18%. I did a manual compression test and #8 was the lowest at 170psi. Before removing the valve cover and disabling the engine completely I added oil into the cylinders through the glow plug holes and cranked. I ran another relative compression test and now they are all 0%. After running the compression test the truck starts and runs good. It's interesting that only one bank that had no compression.

I'm a member of the "New England" Browning clan, which is pretty large.

No relation

I've been told there are no differences but I wanted to see if anyone had run into this before. Seems like the numbers might be the only difference. I'm going to suggest that he puts the transmission in and try it. Thanks!

I have customer that has a F150 Heritage and he needs a transmission. Can any body tell me if the 4L3P DA and the 1L3P HA transmissions are interchangeable?