Quote:
Originally Posted by BR3W CITY
Cline, I know my stuff...and even to me that sounds like latin 
Can you clarify a little bit? Not sure how to use the info you put up. |
Sorry about that, I know you have been battling this for quite some time.
Boostedc10 did a great job explaining!!
A worn AFL bore does not always set Solenoid Performance codes or TCC performance codes such as p1870.
You may want to install a pressure gauge on the trans & Closely monitor line pressure....While monitoring Current applied to the EPC, This can be done through a Scan tool if it shows the Current in Amps. I use a DVOM hooked directly to the 2 EPC control circuits. Use the chart below as reference.
I had a '04 2500HD with a 4L80E that I thought was slipping the TCC upon initial apply, It turned out it was falling out of 4th into 3rd then back to 4th. The O/D clutches were distressed & the AFL valve bore was worn. Reconditioning the valve body with a Sonnax Sure Cure kit & new clutches Fixed it.