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My 1994 gmc 1500 4x4 truck automatic transmission won't shift out of second and into third and higher gears

The rpm will just go higher. Reverse ,1st and 2nd seem to work fine. What would cause this problem? Should I get it flushed and serviced ?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz
  • 76846 Answers

SOURCE: 97 gmc pickup with automatic transmission trouble

1st thing to do is test the system for codes, the problem is most likely a failed or stuck shift solenoid indside the trans, have you ever serviced the trans, sometimes a fluid and filter cahnge will cure these kinds of issues.

Posted on Nov 02, 2008

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mrgreenz
  • 962 Answers

SOURCE: slight miss in engine, hard shift from 1st to 2nd long 2nd gear

Check both O2 sensor(s) and catalytic coverter.. P0420 means catalyst below threshold. Also check the sensor at the transmission and solenoid.

Posted on Feb 06, 2009

csmock132
  • 4669 Answers

SOURCE: Transmission won't shift!

Does it just not shift up to 3rd or when it shifts to 3rd it is just like neutral?

Posted on Mar 06, 2009

  • 1 Answer

SOURCE: Transmission won't shift from 1st to 2nd gear on it's own

Have someone scan the transmission for bad shift sensors.

Posted on Apr 28, 2009

RamTek
  • 377 Answers

SOURCE: Transmission problem in E230 Benz

What you need to check is the transmission release bearing because if there is a clearance on the release bearing you will encounter this problem and also check the transmission oil.

Posted on Jun 08, 2009

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Transmission will only shift in 4 low,no codes showing


1994 GMC 4l60e transmission shifting problems - CarGurus

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CarGurusJan 17, 2011 - 1994 GMC 4l60e transmission shifting problems - I've got a 1994 GMC Sierra 4X4 5.7 I ... If you put it in low and lift the handle, it will go into second .... Justchange 1-2 - 3-4 solenoids first and if that doesn't work change the ...

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Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

Try putting the shifter in reverse, holding the brakes firmly, and giving the car gas. If the car reaches a higher RPM and suddenly slams into reverse it is the pump. The pump will only build enough pressure to engage reverse with higher RPM's. If the pump is severly damaged it won't engage at all, but if this is the case it probably won't engage third or fourth gear either at that point. If the problem is with the linkage, reverse just won't engage whatsoever, despite RPM's. I'd say start with the shift linkage. If it's bent or misadjusted it could cause reverse to not be fully engaged. The TCU doesn't control reverse at all, since there are no shift points and no need for the torque converter to lock.

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Sam,

I would start with a transmission fliud and filter service.

I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.

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Had a similar problem with same model pickup but would shift into third only after reaching high RPM in second @5000. There was TSB that came out about this a few years ago. I had to replace the valve body in the transmission to fix the problem and worked perfectly after that. Hope this helps!

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