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Old 11-26-2012, 08:33 AM   #1
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Automatic transmission fluid will not flush out

Hi, I recently purchased a 97 Wrangler Sport 4.0 with an automatic transmission. The Jeep sat in a field for a couple of years and I'm gradually making my way through all the repairs. The previous owner parked the car because of transmission problems. She had the transmission rebuilt and it ran great for a few months and then it started slipping again. That's when she parked the Jeep.

I dropped the transmission pan to change the fluid and filter. The fluid was very clean and there was hardly any shavings on the magnet. The filter was black and clogged.

I installed a new transmission filter, put the pan back on and replaced the fluid that drained out. I went to flush the rest of the fluid by attaching a hose to the passenger side line. Started the Jeep, put it in neutral and nothing came out. It appears something is clogged up.

The next day I drove the Jeep around my caul de sac because I was anxious to see if it was going to run. Never went over 5 mph. Drive and reverse worked. Then after about 10 mins, with the motor still running, I put the shifter in reverse and the engine stalled. It really feels like something in the transmission was bogging it down.

Any advice?

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Old 11-26-2012, 08:50 AM   #2
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Maybe the transmission cooler inside the radiator is clogged. Try disconnecting the driver's (input) side hose to the cooler & see if the hose on that side drains after starting the engine and shifting into neutral. If the cooler is clogged, maybe you can back flush it to save it.

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Old 11-26-2012, 01:37 PM   #3
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Thanks for the advice, I'll give that a shot tonight and let you know what happens. Is a clogged transmission cooler repairable or does it need to be replaced?
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Old 11-26-2012, 01:52 PM   #4
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Maybe back-flushing it might save it if it is clogged, I'd at least try that first. If a clogged cooler ends up being the problem & back flushing it doesn't clear it up, the radiator will need to be replaced.

No guarantee of course that your cooler is clogged, and the odds of that being the root cause of your problem are not high, but seeing if the transmission can pump ATF out the hose that connects to the input side of the cooler will help verify one way or the other if the cooler is indeed clogged.
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Old 11-27-2012, 12:43 PM   #5
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Thanks for the help and advice. It's looking like this will be a project for the weekend. I'll let you know what happens.
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Old 11-27-2012, 01:05 PM   #6
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Disconnect both cooler lines at the tranny end and blow through them with low pressure compressed air. That will find any clog in the cooling system.

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Old 11-27-2012, 02:22 PM   #7
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All that black stuff in the trans filter could be the clutch pack parts and bits. If so then the cooler in the bottom of the radiator is probably plugged. I wonder if the trans was actually overhauled and why the filter would be clogged. Not sure of what years but some Jeeps don't pump fluid in Netural, it needs to be in gear to pump....just a thought.
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Old 11-27-2012, 05:14 PM   #8
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A possibility is the rebuilt tranny was installed without flushing the cooler and lines. Once the new tranny was up and running it pushed all the crap left in the cooler from the old tranny and lines into the new tranny causing the filter to plug.

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Old 12-02-2012, 11:29 PM   #9
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Well I think I had a good weekend. I disconnected both cooler lines and blew low pressure air through the transmission cooler from the discharge side. It's clear now. I also flushed the transmission. The first bit of fluid was pretty dark and then it got pink pretty quickly. I drove the Jeep around the caul de sac (my neighbors have to think I'm nuts) and it seemed to be OK. I'm not sure how the tranny shifts gears because I don't think I got it fast enough to actually switch gears. When I went to dispose of the old fluid, there was a fair amount of sediment in the bottom of the bucket. I need to fix the throttle valve cable and then the jeep should be road worthy. The little clip that hooks the TV cable to the throttle lever broke off. Has anyone come up with any creative fixes for this or should I just replace the cable? After the TV cable is fixed, I'm planning to drive the Jeep for a few miles and then replace the filter and flush the fluid again. Hoping I can get off pretty cheap here.

Thanks
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Old 12-03-2012, 12:10 AM   #10
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Quote:
Originally Posted by michaelhsapp View Post
I'm planning to drive the Jeep for a few miles and then replace the filter and flush the fluid again. Hoping I can get off pretty cheap here.

Thanks
I was just going to suggest this but I see you're ahead of me.
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Old 12-03-2012, 07:47 AM   #11
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Another question. How far should the transmission fluid dip stick extend into the transmission? This jeep has a chrome aftermarket dip stick on it. The tip of the dip stick extends about 1/8th of an inch through the bottom of the hole in the transmission.

Thanks

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