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post #1 of (permalink) Old 10-13-2002, 06:08 PM
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TJ with slipping transmission? What\'s going on?

My brother and I both recently bought 1999 Jeep TJ 4x4s with the 4.0L I-6 and automatic transmissions. Both have been lifted 2.5" and have 32" tires. There is this short-but-steep bank at our camp that I tried to climb up last weekend. It's steep enough that the rear bumper/receiver hitch hits when you start up it. By the time my front wheels got over the top (6 feet or so), my Jeep just wouldn't go. It was like it was slipping or something. I figured that maybe the transmission was cold or something and just blew it off. This weekend, both of our Jeeps were at camp and my brother's did the exact same thing...when it was hot. I then tried to go up a long and steep gas-pipeline hill and had slippage before I got to the top. I barely made it, even though I had plenty of traction and never spun a tire. Once we get back on flatter ground, everything is perfect again Yes...I did check the transmission fluid when it was warm, idling, and on flat ground. It was right the the top of the acceptable range. Is the slipping because the fluid has all moved to the back and is allowing the auto tranny to slip its plates? Should I add some extra oil (above the range maximum) to prevent this from happening? I'm new to the world of Jeeping, but I've been wrenching on trucks, dirt bikes, ATVs, and snowmobiles for years...so I'm not the average idiot. Any help will be greatly <font color="brown"> </font color> appreciated.
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post #2 of (permalink) Old 10-13-2002, 07:24 PM
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Re: TJ with slipping transmission? What\'s going on?

If you are going at more than a 40 degree or so incline the fluid is running away from the filter/pickup. Adeep pan will help your problem. Just be sure to get the extended pickup also. About two more hills like that and you'll be towing home.

Jackie
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post #3 of (permalink) Old 10-13-2002, 07:25 PM
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Re: TJ with slipping transmission? What\'s going on?

"Is the slipping because the fluid has all moved to the back and is allowing the auto tranny to slip its plates? "

You got it! At extreme angles this will happen. You can greatly lessen the situation by running a deeper pan with a filter spacer. This makes sure the pickup is covered in fluid at big angles. If you just add fluid to the stock pan, you will immerse the valve body in fluid and that will cause more problems than you need.
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