New 4l80E issue

[fastonthetrack]

Yeah i figured if the TCC was doing what it should then OD would be engaged... the RPMS drop but not down to where they should be at.

 

[1997chevydriver]

Quick way to check od is get up to speed and shift into 3 from od and see what happens

Sent from somewhere in MN

 

[fastonthetrack]

it shifts from 3 to OD no problem manually, just need to figure out why it cruises at such high RPM

 

[fastonthetrack]

Stock rear end gears too

 

[1997chevydriver]

Cc dually probably has 4.10s correct? What tire size ya got?

Sent from somewhere in MN

 

[fastonthetrack]

They are stock tire size.... it was running normal a week ago, that's the only reason for my concern now. Not sure what the stock rear end gearing is

 

[outalne94z71]

They are stock tire size.... it was running normal a week ago, that's the only reason for my concern now. Not sure what the stock rear end gearing is

duallies got 4:10

there were 2 sizes on tires, the rare 215/86/16 and the common 225/75/16

 

[1997chevydriver]

They are stock tire size.... it was running normal a week ago, that's the only reason for my concern now. Not sure what the stock rear end gearing is

Well then.............. I'm outta ideers

Sent from somewhere in MN

 

[LT1/TA]

My dads 94 dually has 4.56 gears and 235/85/16's factory and his turns up pretty high at 60MPH

 

[fastonthetrack]

What should OD rpms be with stock tires and gears then at 60ish?