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Discussion Starter #1
We have a 2011 Coyote engine/6R in a pickup truck.
Engine and trans are stock, lifted from the Mustang, and installed in the truck.
There is a Ron Francis harness and computer flash in it.
The trans will not shift. Engine runs just fine.
We have had 2 trans shops look at it, and have all come up empty.
One shop completely went thru the trans, and found no faults.
The last shop said that when they disconnected the trans harness, there were no codes set.
We've not been able to link our HPT suite to it.. Still working on that.
However, a scanner we have, shows no codes.
We do 99+% GM work, and have this one Ferd. So, our expertise is limited.
NE1 have a suggestion as to where to look?

TIA,
 

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We have a 2011 Coyote engine/6R in a pickup truck.
Engine and trans are stock, lifted from the Mustang, and installed in the truck.
There is a Ron Francis harness and computer flash in it.
The trans will not shift. Engine runs just fine.
We have had 2 trans shops look at it, and have all come up empty.
One shop completely went thru the trans, and found no faults.
The last shop said that when they disconnected the trans harness, there were no codes set.
We've not been able to link our HPT suite to it.. Still working on that.
However, a scanner we have, shows no codes.
We do 99+% GM work, and have this one Ferd. So, our expertise is limited.
NE1 have a suggestion as to where to look?

TIA,
Without an HPT or some kind of data log really hard to say.

I would definitely pull out the solenoids and replace them, making sure to match the original solenoid codes. And then go through all the valves in the body.

You say it won't shift, but what gear is it in? If it is stuck in neutral, 3rd or 1st all are very different situations and will tell you what electronics and hyd circuits to look at.

If there was an electrical fault it should default into 3rd or 5th (or something similar). The zf family all do that, and that's just to do with the low/high solenoids, and the original failure speed. If the speed was 0 it should default to 3rd and just stay there. Which means you're dealing with the front e drum, probably the input planet, and the secondary sun in the rear planet set.

When you approach these 6 speeds you have to get enough info to decide whether it is hydraulic or electric and then go forward. Personally I find the trans pretty easy to work on, once you have the snap ring tool. Best off pulling the whole thing, and disassembling and inspecting if nobody can figure it out.
 

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Beyond old
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Discussion Starter #3
Thanks for the response. We've not been able to get HPT to link.
A local rebuilder said it looked like the PCM was at fault.
We've sent the PCM back to the people that programmed it, and made the harness.
That's been a couple weeks... No answers.
 
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