starting to have a few problems with my box changing from 3rd to 4th had the box reconditioned a few years ago but starting to think they didn't do a great job and dint check the solenoids.saw a post a while ago about somebody changinging one but cannot seam to find it for some reason.just like to know if anyone knows which solenoid it is in the box its the td6 box any help is great

The GM 5L40-E transmission has 3 shift solenoids:

• 1-2 shift (A)
• 2-3 shift (B)
• 4-5 shift (C)

but there is no shift solenoid for the 3-4 shift.





One of the accumulators controls the application of the Direct Clutch for the 3-4 shift, so I wonder if it might be worth checking that?

Click image to enlarge

Thank you Phil I will get it stripped down and check them out