Torque converter slip?? [Archive] - JKowners.com : Jeep Wrangler JK Forum

: Torque converter slip??


usmcdoc14
02-23-2008, 05:37 PM
While pulling some NC good ol boys out of thier front yard tonight (yes, front yard) I could not "pull" them out, I would stomp it and the engine would drop RPM but no tire slip, no nothing. It felt like the torque converter was slipping too much. Anyone else have this issue?
in 4wd, OD off, traction control off.

Oh, and I used the winch to get them out.

gcg
02-23-2008, 07:39 PM
Did you try 4 lo? I've had similar experiences with all my jeeps in 4 hi - I'm often amazed at how little it takes stop them in 4 hi.

usmcdoc14
02-23-2008, 09:02 PM
Did you try 4 lo? I've had similar experiences with all my jeeps in 4 hi - I'm often amazed at how little it takes stop them in 4 hi.

yup. 4hi. it was just booooooooooooog when I stomped on it. I am not used to that so I have no clue if its "normal" :laughing: I used to only drive a manual so certain things still feel odd :laughing:

igofshn
02-23-2008, 09:29 PM
You should have used 4 lo. 4 hi and the auto has a tendency to do that. Normal. Just not enough rpm's.

nam6869usmc
02-24-2008, 05:53 AM
You should have used 4 lo. 4 hi and the auto has a tendency to do that. Normal. Just not enough rpm's.

Yep,, 4Lo..coming home from work on a snowy day a women did a 360 & went into the woods / stuck. 4Lo & my snatch strap wasn't even an issue, pulled her right up & out of there.... She was still thanking me as I pulling away... Last Saturday Raiusch Creek on a trail ride , pulled 2 tj's out same (4Lo and wasn't an issue.

usmcdoc14
02-24-2008, 03:57 PM
4l/4h is not the question (I did not really have the room to shift to 4L) but the slip before even a tire broke loose.

Maybe I am just used to a manual or a v8 :laughing:

gcg
02-24-2008, 05:28 PM
4l/4h is not the question (I did not really have the room to shift to 4L) but the slip before even a tire broke loose.

Maybe I am just used to a manual or a v8 :laughing:
What you are describing is the same scenario I was talking about in an earlier post. I remember once in my XJ trying to back up an incline to get out of someone's way. The incline was steep, but not that steep. I thought I was in 4 lo (have an Atlas II in it), but was actually in 4 hi. Basically the vehicle just stopped. I gave it more and more gas and it just wouldn't move. The engine revved a bit but nothing broke loose and "no go". I thought I had broken something. Then I looked down at the levers and knew what the problem was. After shifting into 4 lo, it backed right up without any problem.

It is surprising how little "off road grunt" our Jeeps have in 4 hi. Try it sometime and see if it seems like the same thing you were experiencing.

PhilD
02-25-2008, 05:23 AM
I run a lot trails in 2WD and 4HI and this happens to me all the time when in 4HI. Just hit the gas and nothing, no spinning wheels, no rpm's. This is not just common to the JK, other auto 4WD's do the same thing. Never had it happen in 4LO on the JK yet.

PhilD
02-25-2008, 05:58 AM
The converter is stalling when it happens.

Because there is no direct connection in the torque converter, the impeller will always spin faster than the turbine a factor known as "slippage." Slippage needs to be controlled, otherwise the vehicle might never move. That's where the stall speed comes in. Let's say a torque converter has a stall speed of 2,500 RPM. If the vehicle isn't moving by the time the engine (and therefore the impeller) reaches 2,500 RPM, one of two things will happen: either the vehicle will start to move, or the engine RPM will stop increasing. (If the vehicle won't move by the time the converter reaches the stall speed, either it's overloaded or the driver is holding it with the brakes.)

crusty1007
02-25-2008, 10:07 AM
the 42RLE is a small transmission derived from the 42RE car trans.
You can lock them up in low range also (even with the 4to1).
oh and they dont respond well to being rocked (R to D) as the input clutch piston goes :nuke: