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I would make sure that all engine side Data was right on,
& you have NO engine performance issues AT ALL
You have a Converter lock-up issue
You have a shift valve or solenoid issue & not going
into 4th gear on command
If you want to try cleaning the valve body & throw some
money at a couple of new solenoids,should they be clogged,
you could,I wouldn't pay someone to do that
I was in the trans shop business,so I say no more
If you have 100,000 on it,pull it, AFTER, you TRY & diagnose
any electrical issues
If it's in limp in mode it won't shift out of 2nd gear. Get the trouble codes read. The solenoid pack is a pretty common failure. But don't just throw parts at it. Get the codes first.
This code means theres a problem with the shift soleniod for the 3-4 shift, have this soleniod tested,its locted on the valvebody if the pan was dropped you will see the soleniod.
Boy O Boy, Don't throw that old trans away, It is most likely OK. Did you change the filter and fluid. A bad speed sensor or a bad torque converter lock-up solenoid will result in a loss of overdrive function. Perform an OBDII scan of the stored faults And look for Speed sensor and lock-up solenoid faults. Watch out for those shops, they will skin you.
PO753 code on a Durango can also be caused by a bad transmision relay in the relay -fuse block behind the battery in the engine compartment. (relay # 31 on 1999 Durango) Before you attempt to replace the 3-4 solenoid, or take to a transmission shop, try changing the relay out with another known good relay, reset the code and try it. I learned this today from an honest transmission shop. Shifts normally again, check engine light is out, and the shop did not charge me a dime. Kudos to Trans Medic in Gresham OR.
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