02 HD - 4L80E Weak Reverse
03-02-2012, 09:52 AM
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02 HD - 4L80E Weak Reverse I picked up a 2002 2500HD a few months ago. Ive noticed that something is not right with the reverse. It struggled to back up an inclined driveway and could barely back over a hump in the road. I almost have to put the pedal to the floor to get it to move. After I left off the gas I hear a thud. No problems backing up on flat surfaces and no problems with any of the forward gears.
Any ideas?
Any ideas?
03-06-2012, 07:23 AM
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What would be locking up in it? If its slipping, I've never felt a trans slip like this. It's not intermittent at all. It just feels as if it can't put the power to the tires.
03-07-2012, 08:01 AM
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Interesting. What were the symptoms cabel1? I need to do a little research. Did you have to pull the trans for that or could you access it through the pan?
03-07-2012, 07:50 PM
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Sometimes it just wouldn't grab in reverse other times it seemed ok but weak. You need to pull the valve body to get the reverse servo out. GM makes a tool to check what length you need
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03-20-2012, 02:33 PM
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Turns out it is slipping. I tried to back up my driveway this weekend, which is at about a 20 degree grade, with over a ton of retaining block in the bed and it almost didnt make it up.
