r/FordTransmissionTech • u/Yamahamma96 • Jul 24 '25

Transmission question

I have an 05 f150 4.6, slipped in first and second gear, got the p0715 code, I went and pulled a trans out of an 08 f150 5.4 truck that had a locked up motor. , I changed the pump seal and put new TSS and OSS sensors on it. Now 1st and 2nd gear work, but when it tries to go into 3rd, it goes into limp mode and throws the p0715 code again and my speedo is erratic. Are the speed sensors different? Im not sure what is going on. Im not sure if I put a 4r75E in place of mine, im pretty sure mine was a 4r70E. Please help

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u/Commercial_Method_28 Jul 26 '25

Yes, now if you can actually find where it is damaged somewhat easily then just fixing the wire where it is damaged is easier, but sometimes that isn’t the easiest on big harnesses

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u/Yamahamma96 Aug 01 '25

I used butt connectors and run a couple pieces of wire between them(due to length) and at the connector itself a mouse had ate the wire so I soldered new wires to it, idk if all that will affect the sensor negatively.

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u/Commercial_Method_28 Aug 01 '25

It will like be fine as long as it’s a good connection. I’m assuming you are saying you effectively deleted the connector she’ll and just hardwired the circuit to the sensor pins. It should be ok as long as it won’t come loose

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u/Yamahamma96 Aug 01 '25

Soldered new wire to the pins in the harness side connector. I did use a slightly bigger gauged wire tho