no overdrive 4l60e
 

i have a flt lvl 7 tranny that i had freshened up with ne clutches a few months ago from a local. it does not shift into overdrive. a few weeks before this happened it would jump a couple hundred rpms and then one day it just quit shifting. i replaced the 4th servo. But that didnt help any. it shifts through 1-3 just fine. I have no codes popping up. and i cant figure out what to do next. could it be shift solenoids? even though it has all of the other gears? im at a loss here!!! i need my truck running! its been sitting for likr 5 months. Any help is appreciated.

Sounds like a sungear issue maybe

If it shifts into 3rd then I would take a look at the servo. Most importantly the 4th gear piston. That is the part that is located inside the servo cover itself.

g

Do you have stock servos? or aftermarket? With the aftermarket 4th servo it comes with a washer to help pushe on the Eclip at the top of the pin, I've seen this issue before where someone left that washer out and even though the servo was moving it couldn't push on the pin without that washer to take up excessive clearance, I'm most cases if you have 2nd gear and not 4th its a servo to pin issue, maybe the e-clip is missing, I would start by pulling the servos out and making sure everything is in place per diagram, should be an easy first place to start

washer is in there and have a brand new 4th sonnax billet and a vette servo. no seals are cut. this may be a long shot but i had a remote start put in a while back and they were telling me if it was installed wrong it can mess with my transmission. well last summer i got heated when my transmission line blew on the hiway. i punched my steering wheel a few times and shattered the bearings. i had them replaced along with another clock spring. one of the remote start wires had a diode soldered in and the shop that did it didnt put it back on. not sure if over time it could of messed with the electronics inside or something.

Has it not had 4th since the local freshen up or was it okay then lost 4th?

g

It was ok for a while then it messed up. And I really didn't beat on the truck either because I need a re tune. Its super lean under wot

First I would look into some anger management classes, then if I got an trans in that had no 4th gear I would first have it data logged to see if its commanding a 4th gear(this turns on a shift solenoid) If you have 1st gear the solenoid should be ok, if it is commanding 4th but not shifting and the linkage is set right/gear position indicator good, I would pull the valvebody while the trans is in the truck and aircheck the 2nd and 4th gear feed holes with an air gun while watching the band movement, while doing this you can reach up with a screwdriver and make sure the band is tight, if not, then its a servo/pin issue, or worn band/drum issue. Also is reverse and 2nd trouble free? beast shell?

Watch for band movment here

Attachment 118363

air check with 50 -60 psi here for 2nd gear

Attachment 118362