Trans Temp Light and Slipping in Reverse?

RFCRD · **Posted:** Mon Aug 28, 2006 9:51 pm

quivvy wrote:

Also, a few times when backing (in reverse obvsiously) uphill from a stop, my jeep wont budge! The RPM's rise and the jeep sits there.... I'm having this looked at too.

Can't explain the overheat but not being able to back uphill is common to this transmission design. Had this happen to my CRD several times. Basically the transmission fluid runs to the front of the pan leaving the oil pick-up tube from the main filter sucking air. No oil, won't move. I already complained to DC about this issue, they told me to anticipate my maneuvering and don't get in a situation where I need to back uphill.

jason thompson · **Posted:** Mon Aug 28, 2006 10:05 pm

RFCRD wrote:

quivvy wrote:

Also, a few times when backing (in reverse obvsiously) uphill from a stop, my jeep wont budge! The RPM's rise and the jeep sits there.... I'm having this looked at too.

Can't explain the overheat but not being able to back uphill is common to this transmission design. Had this happen to my CRD several times. Basically the transmission fluid runs to the front of the pan leaving the oil pick-up tube from the main filter sucking air. No oil, won't move. I already complained to DC about this issue, they told me to anticipate my maneuvering and don't get in a situation where I need to back uphill.

I am not sure but I thought that the 4 speed auto in the KJ was the same basic design as the 4 speed auto that came in the XJ
if so then how have I seen XJ's back off of an obsticle when they were draging the front bumper on the ground?
I know that I have done this in the TJ but it has the 3 speed auto a whole differant beast

quivvy · **Posted:** Tue Aug 29, 2006 7:00 pm

Don - CO is incredible!

I was driving down 294 heading north about 2 months ago and saw your jeep in the parking lot that they call the toll way heading home from work.

anyway - found out that the sensor was bad on the tranny

I smile because its time for a tranny flush (33k miles) and now the stealership has to drop the pan to get to the sensor anyway so i get a trans flush for free under waranty!! (all i have to pay for is the filter).

so it worked out good. guess there was really no problem anyway.... im just dissapointed with chrysler trannys in general - they should NEVER have a reverse problem!!

dirtykj · **Posted:** Tue Aug 29, 2006 7:44 pm

jason thompson wrote:

OK I will explain it is realy simple

I had trouble getting out of a 3" pothole, in reverse. Had to put it in 4LO to get out of that. Somehow I don't think the story is that simple. I'm betting on insufficient fluid pressure.

Jeepjeepster · **Posted:** Tue Aug 29, 2006 8:03 pm

I think it all has something to do with the torque convertor myself. It lets the tranny slip to much causing to much heat. Thats why it doesnt back up well. With the tall gear and the crappy torque, it doesnt get enough torque. Anyone every lay the jeep to the floor while holding the brakes? It doesnt do anything, just hums. :roll:

jason thompson · **Posted:** Tue Aug 29, 2006 8:16 pm

dirtykj wrote:

jason thompson wrote:

OK I will explain it is realy simple

I had trouble getting out of a 3" pothole, in reverse. Had to put it in 4LO to get out of that. Somehow I don't think the story is that simple. I'm betting on insufficient fluid pressure.

If the problem is that bad then the pic in you avitar/sig thing would be imposable
It is simple machanics but just for clairification I will be gettint some "things" done to the TJ and will ask the "trans man" tomarrow what he thinks

But if you must see forr your self then here is a very simple test
put a 4X4 pcs off wood blocking both front tires and try to back over it?
Then use the same pcs and try to go forward over it?
Both should be very easy but I bet that it is harder than it looks
I had what I thought was an issue with the TJ and did the same thing and all I did was push the 4X4 along the drivewayand had trouble in reverse
different trans though

Also the transfer case has nothing to do with the fluid in the trans it is nothing more than some extra gears slaped on the back with 2 out puts and 1 in put
so I can not see how that would affect the trans slipping

jason thompson · **Posted:** Tue Aug 29, 2006 8:21 pm

Jeepjeepster wrote:

I think it all has something to do with the torque convertor myself. It lets the tranny slip to much causing to much heat. Thats why it doesnt back up well. With the tall gear and the crappy torque, it doesnt get enough torque. Anyone every lay the jeep to the floor while holding the brakes? It doesnt do anything, just hums. :roll:

the power breaking trick is very very close to impossible with any thing that has rear disk breaks and the right proportioning valve in the breaks
wich KJ's have thats why they can tow so much weight

FreedomKJ · **Posted:** Tue Aug 29, 2006 11:32 pm

FYI, putting your t-case in low (2.72:1) doesn't multiply horsepower, it multiplies torque. You actually have less horespower to the wheels.

Oh, and the 42RLE tranny used in most KJs (2nd half of 2003-2006, excluding CRDs) is the same tranny that is in the TJ.

4low is also not ideal for all situations offroad as you should NEVER exceed 25mph in 4low.

As for the slipping in reverse I've noticed some slipping, but nothing to the popint of holding me to a standstill.

I've had no overheating problems, even climbing in 4hi, but my KJ is one of the few oddballs that actually has an external trans cooler from the factory.

RFCRD · **Posted:** Tue Aug 29, 2006 11:36 pm

jason thompson wrote:

RFCRD wrote:

quivvy wrote:

Also, a few times when backing (in reverse obvsiously) uphill from a stop, my jeep wont budge! The RPM's rise and the jeep sits there.... I'm having this looked at too.

Can't explain the overheat but not being able to back uphill is common to this transmission design. Had this happen to my CRD several times. Basically the transmission fluid runs to the front of the pan leaving the oil pick-up tube from the main filter sucking air. No oil, won't move. I already complained to DC about this issue, they told me to anticipate my maneuvering and don't get in a situation where I need to back uphill.

I am not sure but I thought that the 4 speed auto in the KJ was the same basic design as the 4 speed auto that came in the XJ
if so then how have I seen XJ's back off of an obsticle when they were draging the front bumper on the ground?
I know that I have done this in the TJ but it has the 3 speed auto a whole differant beast

My understanding is the XJ used an entirely different transmission (also been told it's very reliable). The 4 spd in the KJ and the 5 spd used in the KJ CRD are in the same design family. I'm told this reverse slipping problem is also found in some Ram pick-ups using the 5 spd (same as the CRD).

AdamIsAdam · **Posted:** Fri Sep 01, 2006 10:49 pm

I've always noticed a slipping that's like a shimmy when in certain reverse situations. Ex, just backing out of my driveway. But now that I think about it, I think it's only when I'm backing uphill even if slightly. But it's not so much slipping as it is shimmying.

But this is good info (most of it). I always prefer 4Lo when possible. And it's good to remember how to cool the tranny should the light come on.

Jeepjeepster · **Posted:** Sat Sep 02, 2006 10:46 am

RFCRD wrote:

jason thompson wrote:

RFCRD wrote:

quivvy wrote:

Also, a few times when backing (in reverse obvsiously) uphill from a stop, my jeep wont budge! The RPM's rise and the jeep sits there.... I'm having this looked at too.

Can't explain the overheat but not being able to back uphill is common to this transmission design. Had this happen to my CRD several times. Basically the transmission fluid runs to the front of the pan leaving the oil pick-up tube from the main filter sucking air. No oil, won't move. I already complained to DC about this issue, they told me to anticipate my maneuvering and don't get in a situation where I need to back uphill.

I am not sure but I thought that the 4 speed auto in the KJ was the same basic design as the 4 speed auto that came in the XJ
if so then how have I seen XJ's back off of an obsticle when they were draging the front bumper on the ground?
I know that I have done this in the TJ but it has the 3 speed auto a whole differant beast

My understanding is the XJ used an entirely different transmission (also been told it's very reliable). The 4 spd in the KJ and the 5 spd used in the KJ CRD are in the same design family. I'm told this reverse slipping problem is also found in some Ram pick-ups using the 5 spd (same as the CRD).

This is true. The xj used a tranny called the AW4. It was bullet proof and wil last forever if you change the oil in it.

I wish the libby had it. :cry:

Wonder how these trannys hold up in the wranglers? They see alot of offroading and heat in those things. Alot more torque at low rpms too. I believe the 4.0 gets something like 75% of its torque at idle? :shock:

RFCRD · **Posted:** Sat Sep 02, 2006 4:16 pm

AdamIsAdam wrote:

I've always noticed a slipping that's like a shimmy when in certain reverse situations. Ex, just backing out of my driveway. But now that I think about it, I think it's only when I'm backing uphill even if slightly. But it's not so much slipping as it is shimmying.

But this is good info (most of it). I always prefer 4Lo when possible. And it's good to remember how to cool the tranny should the light come on.

You should take a trip to the dark side and read the issues with the CRD transmissions. They are common in basic design. Seeing everything from being underfilled to defective filters to a strange coincidence of overheating and blown torque converters. Hummmm, I wonder why???

The first time I stuck mine nose downhill and tried to back out, it was shaking & shimmmying so bad I thought it was coming apart. That was on concrete, would hate to try that in the mud. After I raised Hell (several times) and finally got the filter TSB done, it has virtually gone away. I do know the TSB calls for 4qts of AFT+4, there are 7qts itemized on my paperwork. First 4, then 2, then 1 more. Not difficult to figure this one out.

jason thompson · **Posted:** Sat Sep 02, 2006 5:49 pm

well I just got back from doing a little test out on the trail and I found no slip no shimmy just some wheel spinn at 2500 rpm in reverse up a real steepp hill
put 'er in 4lo and up ya go
If I were one of the folks who was having this "slipping" issue I would skip the stealer ship and go to a GOOD machanic have the fluid and filter changed and try again
also it was like 90+ and we ,2 kj's, had no over heat issues and yes we had hills but no sand in fact I dont remember the jeep even feeling hot
un like my TJ wich on the same trail would be burning your feet

Trans Temp Light and Slipping in Reverse?

Who is online