I called doug, he's the one that said it more than likely tune related. Kyle what else should I check? The weird part is I don't loose 3rd 4th or 5th or reverse when the od light starts flashing and The codes reads a circuit problem solenoid D. As soon as it starts flashing first gear is gone it dosnt even try to use it. When the lights not flashing the trans feels perfect not one problem. Back when I first got this tranny it had a couple shift flares but I havnt had one since I got the gogo solenoid.
when the solenoid gets hot,it prolly wigging out resistance wise or wiring. you would need to drive the truck until the light starts to flash,then resistance test that sol thru the wiring,or at the bulk head. resistance should be around 5.5 ohms.
in reverse direct is engaged thru the manual valve in the trans. hence why reverse isnt effected. i have no doubt once the code pops,the trans will shift 3-4,ignoring 5th(direct)
as long as reverse feels good. your direct clutches should be fine. the solenoid very well could have just gone bad. just because its not stock doesnt mean it cant ever have issues.
good luck
