Question about 1993 GMC Sierra K1500

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4l60e no forward or reverse gears operating

It started to slip in 4th ,if I let off it then stepped back into it down shifting it to 3rd it would be fine it seemed to do this at about 40 or 50 mph It shifted 1st,2nd,3rd, then nothing in fourth I tried down shifting it I had nothing in any gears , Is this a torque converter problem or a transmission problem or both ,it seemed to shift fine before this and didn't feel like it was slipping in any of the other gears besides what I discribed in 4th .

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  • logan124 May 11, 2010

    As for for the original complaint, fourth gear or overdrive should not engage below ~50mph. In overdrive a solenoid is energized sending xmsn fluid to the overdrive clutch drum inside the torque converter. Sounds like your original complaint of slipage indicated a potential problem with the torque converter clutch and/or solenoid control. For clarification: Does the truck now move when you shift manually into reverse, overdrive, third, second, or first?



    As for no forward or reverse, when the powertrain control module (PCM) sees transmission the inputshaft (TISS) and outputshaft speed (TOSS) difference is too high it knows there is excessive slipage occuring somewhere between the engine flywheel and the transmission output. When this occurs a fault would be set and the PCM can prevent the transmission from operating at all protecting the powertrain from further damage. A question for clarification: (1) How many miles are on the transmission? Less likely, but if however the PCM isn't disabling the transmission no forward or reverse would indicate a damaged torque converter or input shaft.



    Even if the torque converter is the root cause that may not change the service response. Unfortunately slippage in the transmission and torque converter isn't likely to just all of the sudden occur. And the longer the condition existed the more debris has had a chance to circulate through the transmission and do damage to the front pump, sealing surfaces in the clutch drums, and passages in the valvebody. If it has existed for a while my opinion is that you would be ill advised to replace only one of them.



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It sounds like your torque converter or the pump is broken.

Posted on Jan 10, 2010

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2001 Chevy S10 4x4 4L60E transmission works perfectly until 50MPH then I lose 3rd and 4th gear, 1st, 2nd and reverse are normal. Never happenend before, been parked since. Fluid is clean. Any ideas?


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One forward gear only


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Gear missing or slipping


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No upshift or slipping upshift


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No downshifts


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Refer to Slips in First Gear .


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Refer to Slipping or Harsh 1-2 Shift .


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Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .


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Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .


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Refer to No Part Throttle or Delayed Downshifts .


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Refer to Second Gear Start .

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2007 Chevy Avalanche 3rd and 4th gear are not working


From what you are describing, it is possible either the 3-4 actuator is no longer playing with the 3rd & 4th clutch packs, only way to know for certain is to hook up the good ol' pressure gauge to trans. system, yeah, you think the Chevrolet dealer should know this right?

Sell it now if you can!
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1 Answer

1996 gmc jimmy will not shift to 3rd gear


Hi, It may be in LIMP mode.

What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Common failures on 4L60E, symptom any possible repair:

Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under-hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter :ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

3rd gear starts, can manually shift through all gears. When car has been turned off for a bit, then back on it will run normally.: VSS dropoff w/ Hi-stall converter. The rpms are too high, but VSS is showing no movement. Happens after a tire burning take-off. Doesn't store a code, will not throw a CEL (I've heard that it will store a code if it happens 3 or more times). Cure: Reprogram PCM for VSS dropoff -- PCMforLess knows about it.

If you can get the Jimmy for no more then $500.00 and the engine sounds good and body is good, you may want to invest in the repair of the jimmy. Also note that to have a close look at the fuel line along the frame on the drivers side just by the back doors, the line is know to corroded there on all the SUV's

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1 Answer

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The shift pattern is pretty much the same on all 5 speed cars. The top row is the odd numbers, 1-3-5
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Here is the key: The shifter is slightly spring-loaded to the center position. If you hold in the clutch pedal and pull the shifter to neutral, and let go of it, it will automatically be lined up in the position, that if you pushed it forward , it would go to 3rd gear, and if you pulled it back, it would go into 4th gear.
This way, to start driving, you start out in neutral, grab the shifter lightly, and push it first to the left, then forward. This is first gear, where you start out. when you want to shift to second, push in the clutch, and keeping left pressure on the shifter, pull all the way back . Here is the easy part, 2nd to 3rd. When you are ready, push in the clutch, and just push the gear shift forward , till it hits neutral, and is spring loaded to the middle. Then you just push it straight forward to 3rd, then next shift, straight back to 4th.
Last gear, 5th: push forward to the neutral row, then Push to the right till it lines up ,and forward to the 5th gear. Reverse should only be shifted into from a dead stop. Find neutral, push the shifter all the way right, then pull back towards you. Hope this helps.
Practice a bunch in the driveway!

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1 Answer

Only runs in 1st and 2nd gear and reverse.


This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Trans shifts into gear harshly, car feels sluggish off the line
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No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

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4l60e slips in 3rd and 4th


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The ECM should have DTC code in it's memory on how the transmission is Performing and have the Transmission line tested for Fluid pressure.
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no power stuck in 3rd gear electric shop unless youve burnt it up good luck...www.TransmissionGarage.com

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