I was only able to measure the input voltage to the TPS last night: 5.20 V and no continuity to ground (first wire, towards the rear of the vehicle) 5.14 V with no continuity to ground (second wire) and 0 V with continuity to ground (third wire).

I'll have to set up some kind of wiring that'll allow me to read the voltage while the sensor is plugged in since my multimeter couldn't get a reading while jammed into the back end of the harness where it plugs into the sensor. I'll hopefully get that done tonight or this weekend at the latest. I will report back.

 

With manually opening the throttle I was able to get a throttle position reading of 71%, so a bit higher than with my foot mashing the pedal down but not 100%.

In regards to your question about 3rd gear, I must've been in second in that case as I was certainly not doing 105 MPH lol

 

You need a wire piercing probe to hook on to your meter, Then see what the voltage drops to at WOT(signal wire and ground). I believe it's the service manual somewhere, Something like a volt or less.

 

Also WOT shift point on a stock ram should be 4800-5000rpm. 5200 is too high for an un-modified truck, double check your kick down cable. 71% at WOT isn't what I would worry about, especially if cruising is 25-32% and idle is ~13%. I guess what is the question now that it revs? Does it feel like its lacking power, idling ok, ect?

 

So I picked up some wire piercing multimeter probes and got the voltage of the signal wires while at cruising and highway speeds. I'm still waiting for the videos I took to upload to my PC so I can splice them together (live data and video of multimeter readings) but in the meantime this is what I got at WOT and ~65-75 MPH: Wire 1 (5V signal): 5.27V, Wire 2 (TPS Signal Wire): 3.26V, Wire 3 (Sensor ground): .101V.

Also I got a screenshot of the live data when the truck seemingly kicks down when accelerating and revs up to ~5200 RPM:
At around 40-50 MPH it jumps up to 5200 RPM and 85.9% engine load (higher than I can get otherwise) with 62% throttle position and will only go down if I let my foot off the pedal where it'll presumably shift up. Additionally, while this has never happened before, when turning down my street to come home the truck was bouncing back and forth between 900-1200 RPM while going 15-20 MPH. Unfortunately I had stopped my scan tool at this point so I don't have any data for that incident. But something seems quite off.

I'll post another update tomorrow with the full videos if that's any help.

 

Prior to replacing the TPS with the OEM sensor it would start to stall after getting to temperature. Since replacing the sensor that hasn't been an issue. It does feel like it lacks a bit of power in general; I know the 5.9s aren't speed demons but it does take a bit to get up to 60 MPH. For reference my other car, a 2006 Toyota Camry with the 3.6l, supposedly has about the same 0-60 speed as this truck but it feels MUCH quicker.

 

I agree, something ain't right. Unloaded, your truck should never see 85% load, unless you are standing on it from a stop. What is MAP saying at that point?

 

If it will only shift at WOT when letting off there is a problem and I think that is a separate transmission related issue, could be your kickdown cable isn't perfect yet. What is the 0-60 time on your truck? Quad cab or reg? Can you data log the load? Is it suddenly spiking?

 

I wasn't exactly standing on it from a stop, but I did depress the pedal to the floor once going ~40 MPH. The MAP was at about 29 inHG, and based on the live data, it didn't increase when the engine load increased, it was rather steady even when it got up to 85% load.

 

The transmission kickdown cable was supposedly replaced and adjusted when I got the tranny rebuilt 6 weeks ago. I checked it after I received the transmision and there wasn't any slack in the connection at the throttle body.

Supposedly the 0 - 60 times for my truck (5.9L, quad cab, short bed, 4x2) should be somewhere in the ballpark of 8.2 seconds according to a couple of places online. I did data log the load, and it only spikes up to 85% when I slam on the pedal from a relatively constant speed or stand still. It doesn't do it every time which makes this even more confusing.

I have videos of the live data I will upload and post this afternoon, hopefully they provide some insight into this extremely frustrating issue