led tail lights affect E4OD shifting.

[F350crew]

1993 f350diesel E4OD with newly rebuilt Trans. Seems to shift randomly, Wants to skip 2nd and shift in and out of OD when cruising at highway speed. The transmission rebuilder thinks it’s the Led tail lights may be the issue. Do I add a resistor somehow or use a US Shift trans module?

 

[chillman88]

Yes, you will need to add inline resistors. The brake light circuit causes issues with the E4OD when using LED lights. Very common issue.

 

[F350crew]

what kind of resistor and where do I add it?

 

[chillman88]

I have never done it myself. I found a thread which looks like it has an answer for you here:

https://www.fullsizebronco.com/threads/led-load-resistor-help.290737/

 

[Philip1]

what kind of resistor and where do I add it?

https://www.amazon.com/dp/B00DCULNXS/ref=cm_sw_r_cp_apa_glc_fabc_088RHDV1GTRBXKC6H0K4
You add it in parallel with the brake lights