I just installed a Yank 3600 about a 2 months ago and l did the 200 mile break in period. I haven't got on it at all since I installed it, so today I tried. I stopped, put my foot on the brake, and put my foot on the gas for a quick burnoout. Second later, no smoke so I shut it down. It was in D and just reving up. So I went to take off regularly and it took off sluggish acting like it was in 2nd. It wouldnt shift. I took it home and went through the gears 1st to OD.

It sounded like it was engaging but making a clunking noise each time. It even had reverse. Also, checked the fluid. It was topped off and clean
No burned smell. Scanned for codes; got a po502 vehicle speed sensor low input. Did I toast my trans? Any input would be greatly appreciated. Tried a search, couldn't find anything?

 

No VSS wil cause the no shift but sounds like you hit limp mode after you turned car off and restarted did ti go back to normal ?

 

I just shut it off and scanned the codes. Haven't tried to restart it. What would have made it go into limp mode? I just tried to burnout?

 

Went back and started the car, it runs and shifts great! no issues! What would cause it to go into limp mode?

 

A higher stall speed will cause this. The stock programming expects a certain amount of rpm drop down after it shifts, if it see's less of a change it 'thinks' it's slipping.

Some codes need to be set to not report a problem (since there is no problem)

P0751
P0757
It's a good idea to increase the lower numbers in the misfire tables since a smaller diameter converter will cause false misfire detection.