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MaxPower1971 06-10-2013 08:12 PM

Transmission Question
Hey guys long time no post!!

when going to work last week, I noticed my truck would not go into overdrive. It was working perfect the day before. I get the nice 1-2-3-4 and usually at 55MPH overdrive would kick in, BUT when I push my OD button, it works (truck RPM raise and 1 gear down......) but the gear I used to have at 55 is gone. Someone said to try to swap OD and HORN relays, but I dont see an OD relay in the underhood box...

Any ideas? Pointes as to where to look at??

1994 2500 4X4 5,9 gasser

Thank you in advance!!

Wh1t3nukle 06-11-2013 10:02 AM

Is the CEL on?

Have you checked the tranny fluid level?

Drive until up to operating temperature
Park and place e-brake
Put in N
Pop Hood and check the Tranny fluid

Also, the shifting is: 1 - 2 - 3 - Tconverter lockup - OD (4th)

MaxPower1971 06-11-2013 07:19 PM

Sorry I forgot to be specific loll

CEL is on but was on since I cut the o2, (code 21)
I have an EGR code (code 32) that's been there for a few months (still trying to figure out that one lol)
and the tranny code 37, that's been there since I bought the truck new in 1995 (it's a 94)

Fluid is fine, no foul smell, level good. It's overdue for a change but I don't think that's the culprit. I suspect the OD solenoid but it's not throwing the code.....Any ideas??

sbrodacz 06-12-2013 10:43 PM

Have you reread the codes and see if it is showing a separate code?

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