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Old 03-27-2013, 09:06 PM   #1
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Auto trans slips in reverse. Help...

Ok so I noticed at the end of last winter the auto trans slipped and jerked around in reverse one day when I was backing out of the drive way. That was the last time it happened up until a couple weeks ago. It's done it about 3 or 4 times now. it hanst been as bad as the first time but still slips a bit almost like its not all the way in reverse. I have no clue what is causing it besides the cold. It doesn't seem to do it once the jeep is warmed up or in hotter temperatures. I flushed my auto trans and changed the fluid with atf-4 and filter before last winter. That was about 15,000 miles ago maybe 20. Any suggestions?

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Old 03-27-2013, 09:31 PM   #2
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Mine was doing this in all gears and I also did a flush and now it will grab in reverse no problem but won't grab at all in drive. I found a transmission cheaper than I could rebuild mine though so.. I'd be cautious

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Old 03-27-2013, 09:31 PM   #3
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Are u leakin any fluid?
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Old 03-27-2013, 09:36 PM   #4
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Nope no leaks. Hope it's not going to sh.. The bed on me. I don't think it is only happens in the cold.
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Old 03-27-2013, 09:40 PM   #5
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Does it have a check valve on the tranny line going to radiator?
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Old 03-27-2013, 09:51 PM   #6
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Does it have a check valve on the tranny line going to radiator?
I believe so don't all the autos on the jeeps have em?
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Old 03-27-2013, 09:56 PM   #7
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I was actually thinking that it could be my check valve. When I start my jeep it makes a growling sound when it cold only. But if I start it in N it doesn't make a sounds like it could be the check valve.
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Old 03-28-2013, 02:12 PM   #8
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Bump
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Old 03-29-2013, 10:37 AM   #9
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Any other suggestions?
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Old 03-29-2013, 11:22 AM   #10
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When my TJ hasn't been driven in a while, it sometimes takes 5-10 seconds to start moving back out of garage after shifting into Reverse. Since I know my ATF level is where it should be, I am pretty convinced it is only the check valve in the hard coolant line that is probably letting ATF drain past it. Maybe that is your problem too.
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Old 03-29-2013, 12:44 PM   #11
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When my TJ hasn't been driven in a while, it sometimes takes 5-10 seconds to start moving back out of garage after shifting into Reverse. Since I know my ATF level is where it should be, I am pretty convinced it is only the check valve in the hard coolant line that is probably letting ATF drain past it. Maybe that is your problem too.
Ok yeah I was thinking the same thing so ill check into that when te weather warms up and it's not raining or snowing. I take it that the check valve is part of the line and I will have to replace the whole line right?
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Old 03-29-2013, 12:46 PM   #12
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It is part of the hard line but you can buy separate check valves that can be inserted separately. Just get it facing the right direction.
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Old 03-29-2013, 06:01 PM   #13
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It is part of the hard line but you can buy separate check valves that can be inserted separately. Just get it facing the right direction.
Oh ok cool thanks!
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Old 03-30-2013, 12:19 AM   #14
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I was actually thinking that it could be my check valve. When I start my jeep it makes a growling sound when it cold only. But if I start it in N it doesn't make a sounds like it could be the check valve.
My 2001 Jeep Sahara 4.0 with auto has been making that noise for a few seconds for several years now after starting in temperatures below freezing. As soon as I shift out of Park the noise will quit but after idling for a minute or two in any place except Park the noise is gone when I go back to Park. I've tried to find out why the growling sound for some time now but have gotten no definite answers.
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Old 03-30-2013, 11:08 PM   #15
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Ok yeah I was thinking the same thing so ill check into that when te weather warms up and it's not raining or snowing. I take it that the check valve is part of the line and I will have to replace the whole line right?
What is a check valve?
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Old 03-31-2013, 07:43 PM   #16
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on your transmission lines that run into the bottom of your radiator their is alittle valve on the line itself. i believe its the right hose on the drivers side. you could either replace the valve or cut the section with the valve out and replace it with transmission line and see if that helps your problem.
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Old 03-31-2013, 07:54 PM   #17
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What is a check valve?
A check valve allows flow in only one direction & its purpose in the transmission line is to prevent the ATF inside the torque converter from draining into the transmission cooler which is located inside the radiator assembly. If it didn't prevent the torque converter from draining, you'd have to wait for the transmission pump to refill the torque converter with ATF before the Jeep could be moved.
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Old 04-02-2013, 10:01 PM   #18
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My 2001 Jeep Sahara 4.0 with auto has been making that noise for a few seconds for several years now after starting in temperatures below freezing. As soon as I shift out of Park the noise will quit but after idling for a minute or two in any place except Park the noise is gone when I go back to Park. I've tried to find out why the growling sound for some time now but have gotten no definite answers.
The growl is your torque converter being empty from what I understand older Chrysler/dodge transmissions don't pump fluid when they are in park so starting it in N let's fluid in so it isn't dry which equals no growling sound. Most plow guys with older dodge trucks will take breaks with their trucks in N to keep fluid in the converter so when they wanted to start back up again they where not doing it on a dry transmission. A lot of dodge trucks blow transmissions because of that.
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Old 04-02-2013, 10:23 PM   #19
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A check valve allows flow in only one direction & its purpose in the transmission line is to prevent the ATF inside the torque converter from draining into the transmission cooler which is located inside the radiator assembly. If it didn't prevent the torque converter from draining, you'd have to wait for the transmission pump to refill the torque converter with ATF before the Jeep could be moved.
Jerry
I had to replace the longer hose on my TJ and thought about replacing the other one but did not. This morning I put my TJ on the rack, changed the oil & filter to prepare her for the summer. I also thought about replacing the shorter hose and didn't but noticed it had a different fitting before the hose. Am glad I didn't change it or I would have been surprised.

My question to you Jerry is which direction does the flow go in this check valve? Does the check valve line flow from the radiator to the transmission or vice versa?

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