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Bloom99cummins

Transmission rebuilt; now skips 3rd gear

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I have a 99 2500 with automatic Transmission that was just rebuilt and a new two disc tc. The first time I drove it after the rebuilt the transmission shifts quickly from 2nd to 3rd to 4th(O/D). It doesn’t happen when your foot is really in it but when you accelerate normally it jumps up and the engine bogs down. 

 

The transmission guy that worked on the truck told me it was an electrical issue on the APPS sensor but I want to get some other suggestions before throwing money at the wrong problem. Also the APPS sensor is a few months old

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Scan the truck for trouble codes, that is always a good starting point. 

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TV cable not adjusted properly.  Might be to loose causing quick shifts under light throttle. 

I'd look at TV cable first. I haven't done at mod nit I have gone through and cleaned all battery connections. I also haven't check for ac noise.  In 15 years my alternate is one of the few things I haven't had to replace..

 

I have had battery cable issues and it caused all kinds of weird shifting

 

Check terminal block below driverside battery for losses connections. I gues that's the grid heater. Those were loose causing me issues to.

 

Good luck 

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Thanks for all the posts. 

 

I’m plannin on doing the WT Mod soon. 

 

I’m at work til Thursday but I’ll start trouble shooting when I get off work.

 

Any more info on the tv cable? Where to start when checking?

 

 

Thanks again

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Posted (edited)

4th gear and TCC lockup are not affected by TV cable. They are electronic. One wire to the trans is grounded to engage lockup, another wire is grounded to engage OD (4th).

 

Here's some copied information from the FSM:

 

"

3-4 UPSHIFT OCCURS IMMEDIATELY AFTER 2-3 SHIFT
1. Overdrive Solenoid Connector or Wiring Shorted. 1. Test connector and wiring for loose connections, shorts or ground and repair as needed. 2. TPS Malfunction. 2. Test TPS and replace as necessary. Check with DRB® scan tool. 3. PCM Malfunction. 3. Test PCM with DRB® scan tool and replace controller if faulty. 4. Overdrive Solenoid Malfunction. 4. Replace solenoid. 5. Valve Body Malfunction. 5. Remove, disassemble, clean and inspect valve body components. Make sure all valves and plugs slide freely in bores. Polish valves with crocus cloth if needed.

 

"

Edited by kzimmer
More Info

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