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I have a 1985 Gmc Sierra with a TH350 transmission and it shifts well but the torque converter doesn't lock in or pull the motor down like it should. I have it hook up to the green and yellow wire (ma

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  • Cars & Trucks Master
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You really should get an automobile service manual for your truck. Haynes makes a good one and it is available at your auto parts store. Don't mess with an auto transmission without a guide book...it is cheaper than replacing the transmission!

Posted on Jan 11, 2013

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Posted on Jan 02, 2017

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SOURCE: electric transmission

Hi. I have a '93 Chevy Suburban that is on the 3rd transmission. What you probably have is the earlier 700R4 transmission. What you should have is the 4L60E. I have done ALOT of research on these transmissions, and what I've found out is this: the 4L60E is essentially the same as the 700R4, with the exception that the 4L60E is completely controlled by the vehicle's computer. The 700R4 uses a more antiquated valve body with a TV (throttle valve) cable. In theory, you could use the 700R4 if you connect the TV cable and properly adjust it. If it's a 4X4, your speed sensor is in the transfer case, so that wouldn't be an issue. The 4L60E used in '93 and '94 will only work in those model year vehicles, because of the type of shift solenoids used. The newer units used pulse width modulation solenoids, as opposed to the older on/off solenoids. I have run my truck with the transmission unplugged and the engine still runs fine. The major problem with using the earlier 700R4as opposed to the correct 4L60E, would be emissions compliance. If you want to discuss this further, email me at big.bad.bones@hotmail.com

Posted on Nov 08, 2008

  • 61 Answers

SOURCE: 95 suburban with 4l60e and manual transfer case.

sounds like a solenoid problem or trans module,

Posted on Dec 13, 2009

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SOURCE: I have a 1992 Gmc sierra manual transmission, the gears are hard

It is an adjustment or clutch replacenment issue. Manual transmissions rarely have a lube issue unless you have seen a big puddle of very thick oil in the driveway.

I think I'd be looking at the clutch of this 16 year old vehicle. Unless you have the tools, time and skill to change the clutch, this is probably a job better left to a professional. Adjusting the clutch mechanism might help for a while but I think you will soon need a clutch job on your GMC.

Thanks for your question at FixYa.com

Posted on Jan 14, 2010

  • 1374 Answers

SOURCE: grand prix torque converter locks up too soon

Either the speed sensor, TCC solenoid , ECU or a stuck check ball in a lockup plate. I recommend taking this to a transmission shop this could get fustrating.

Posted on Apr 05, 2010

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  • 1 Answer

SOURCE: 1995 gmc sierra it has the 700r4 transmission

i have 700r want shift out of 1st gear what could it be?

Posted on Apr 25, 2010

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1 Answer

Transmission hanging up in third


This is most likely the torque converter lockup solenoid. It is inside the transmission.

Nov 27, 2013 | 2003 GMC Sierra 2500HD

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My 1985 GMC Sierra TH350 trannys. The speedometer isn't working but will ping sometimes. I have no idea what it is so anybody please help


The gear that is in the adapter for the transmission is plastic and they would strip out, easy fix and cheap too

Feb 09, 2013 | Cars & Trucks

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Is it normal for my 1985 GMC Sierra TH350 tranny to shift really early. It will shift into 3rd gear by about 18-23 mph any suggestions


No this is not normal and may be a governor or other internal issue with the transmission. Have a local transmission rep[air shop test drove it and see what they think, that is in most cases free.

Jan 14, 2013 | Cars & Trucks

1 Answer

What causes the torque converter not to cut in on a 2005 GMC 2500 sierra, causing the transmission to heat up? This happens when pulling.


the torque converter isnt locking up, if it doesnt lock then it just spins causing the transmission to slip and heat to build. it sounds like you may be looking at a rebuild soon. i suggest going with suncoast transmissions, its what i have in my pulling truck.

Apr 08, 2011 | 2005 GMC Sierra 2500HD 4WD

1 Answer

My 1990 automatic GMC Sierra wont shift out of 2nd, it just revs higher and higher. Any advice? (It will shift from 1st to 2nd when I take my foot off the gas)


Check your transmission fluid, if it is low, the transmission cannot shift into the correct gear from lack of hydraulic pressure. Be sure to check it while the truck is running.

If it is full, you may need to change the fluid and filter; over time the fluid will break down and trash the filter leading to low pressure problems which is why your truck fails to shift any more than 2nd.

Another problem may be that the torque converter is failing to lock yet again from lack of hydraulic pressure or its just worn out.

Feb 10, 2011 | 1999 GMC Sierra 3500

1 Answer

How many times should a 5.7 ,2wd ,4 speed auto shift including O/D. What does the locking torque converter have to do with it


The locking torque converter doesn't slip above certain speeds ... it aids in fuel mileage.

Dec 28, 2010 | 1993 GMC Sierra

1 Answer

I have a 1500, 5.7, 2 wheel drive with a 4 speed transmission with O/D . How many times should it shift including the O/D and what does the lock in torque converter have to do with it?


It should shift 4 times. 1-2, 2-3, 3-4 Then you will feel the torque converter clutch lock up which feels like a shift. The torque converter locks to increase gas mileage.

Dec 28, 2010 | 1993 GMC Sierra

1 Answer

Chevy TH350 trans problem


if you just had it rebuilt should ba a warranty if is was im sure you wouldnt be on here asking so did you install new torque converter when the trans was rebuilt? check the trans filter not clogged how long did it run after the rebuild or did you install it yourself after the rebuild and it doesnt work ? let me just say the torque converter should always be replaced with the transmission new or rebuilt and when the transmission is being installed you have to make absolutely sure the converter is all the way back on the trans if not you will damage the front pump on trans and would need to replace it .

Mar 23, 2009 | 1985 Chevrolet Nova

1 Answer

4l60e no forward or reverse gears operating


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

Jan 12, 2009 | 1993 GMC Sierra K1500

3 Answers

What transmission will fit in an 89 gmc sierra?


if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

Nov 20, 2008 | 1989 GMC Sierra

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