Bought a used 17 F350 a month ago, 104k and its a southern truck and its basically flawless besides a loose shock that rattled the entire truck and some transmission things.
First issue that happens was I went to the store for about 10minute, went to leave and the truck started fine, put into Drive and it was like it was in neutral, put it in Reverse and got it back into the stall. Tried Drive again and nothing again but noticed the gear indicator went straight to 5th gear, tried reverse again that was normal got back into the parking stall and put it into Park. Shut it off then restarted and it hasn't done that since.

Now, the second issue is that most every time I go into D it will illuminate the M then it will dance back to D immediately and it will go into gear with no issues but it seems like what ever sensor or de tent that the shifter/column uses to stop at each gear is either worn down or maybe its out of sync? My last super was a 00 7.3 with the zf6 so this new electronic stuff it out of my wheel house.

Trans shifts good, fluid looks and smells good.

The shifter itself I would consider it a little looser than I would think it should be so maybe there's a plastic bushing or something inside the column that needs replaced but wanted some opinions before I go tearing into the expensive interior pieces of a KR in the new age.

Thanks for any help

 

Currently dealing with a transmission range sensor issue on mine actually setting codes. 17 F250 6.2L 6R100. I would suspect yours is a TRS issue as well… has it set any DTC’s? Pending or current

 

I had a 2019 that would alarm that I was in Park while I was cruising down the road, one of many things that made me get rid of it. Interested to see what you come up with and whether it's a related issue. Ford said they fixed it a buncha times under warranty, but, they didn't.

 

No DTC's, It's so intermittent and random sometimes. I did however notice TWICE that when I park up against a curb and assuming the parking lever/paw/lock isn't fully engaged as the curb is keeping the vehicle from rolling and has the weight of the vehicle when I go into the R detent on the shifter but it will not go into reverse on the dash, the P will not be lite up nor will RN or D like a spot in between P and R but this ONLY happens when I roll the truck up to the curb. When this happens the transmission acts like its in N and the engine just revs with no movement or it trying to move.

Do you plan to replace your range sensor? I'm not sure what controls what we see on the dash and what controls what gear the trans gets put into, I would think they are the same? I'll look into this thanks!

 

My truck, throws a wrench light, tue PRNDL goes dark and the gear indicator goes away. If youre on the road when this happens it throws the trans right into 6th gear as a limp mode. At first it was brief occurrences. It has evolved quite quickly. It has gotten to the point where if the wrench light is when you key on, it will not allow the truck to start, as a default neutral safety feature, because it doesnt know what range its in. It will start fine when the trans is cold, but you can watch it just idling, as the trans temp warms up to 120°+ it begins to get glitchy, in & out, until it becomes permanent. It has also set permanent range sensor voltage codes.
In my first dealings with my problem, I looked up a range sensor. OEMfordparts.com pulled up part number CC3Z-7H557-B which is a dedicated range sensor. I dropped my pan a few days ago to make an attempt at tackling this job, only to find the whole valve body has to be dropped to do this job, and the 6R100 does not have a dedicated range sensor. I assume they sold me one for the 6R140. The 6R100, as it turns out is basically just a beefed up 6R80 and shares some parts… including a lead frame. The range sensor is built into the lead frame and if you spend any time on F150 forums, 6R80 lead frames are notorious for these issues.
I have since ordered and received a new OEM lead frame from EBAY, seeing as how no OE ford parts dealers seem to have them. Tje ebay purchase also came with the bulk head gasket. And I also ordere the pass through connector.
With the help of Fordtechmakuloko’s detailed video on a 6R80 lead frame replacement and the digital 17,553 page ford shop manual I bought for $70, I will be tackling this job in the coming days.

part numbers are as follows:
lead frame : AL3Z-7G276-D
bulk head gasket: AL3Z-7F401-A
pass through connector: 6L2Z-7G276-AA

Ebay link:

https://www.ebay.com/itm/256286650925

FordTechMakuloco’s 6R80 video