jt121212

bought a new built 4l60e and 3200 vig stall, wont go into overdrive at wot...
hitting the rev at 6200 at about 114 and wont shift??? 373 gears/runs at 2750 rpms at 55mph in overdrive... any answers guys thanks

performabuilt

iTrader: (25)

Well first has your car been tuned to allow WOT 4th shift , Many cars with the stock tune cannot make that shift as its disallowed in tuning , First thing to do short of looking at the tune is to look at the scanner data stream and see if its being comanded to make the shift, And note you must like driving really fast lol

jt121212

had it tuned at w2w last weds. he said the car is telling it to shift into 4th but is showing no change in rpms or shifting???

performabuilt

iTrader: (25)

I woundnt know what to tell you then , The trans has no choice but to do what its told. if its being comanded and not happening but will happen under light throttle then it must be slipping , But even that should be noticable, and feel like slipping , But if lighter throttle shift feels good it would seem very unlikley. The 4l60e Has no choice but to do what its told or burn or break something trying, There is no shift fail safe built in hydraulically.

jt121212

could something be put together wrong with the valve body or servo ???

performabuilt

iTrader: (25)

not if it shifts normally into fouth at moderate throttle that means the vavle body and servo assemblies are working and they dont know throttle position like I said they just do what they are told , Like i said there ae only two options either its in fact not being comanded to shift to fourth , Or the 2-4 band is slipping like crazy under the power, But then I would imagine it would feel really sloppy at light throttle also

jt121212

i know w2w said it was telling it to shift into 4th.but why would it be slipping if it was new??? i just installed it last weekend...thanks for your knowledge!!

performabuilt

iTrader: (25)

Thats why I doubt its being comanded, perhaps hey mean that there telling the pcm to comand it , Not that they are actually logging the PCM comanding it. Just bcause you tell the PCM to do something does not always mean it will