Transmission slipping on steep uphil
Posted: Fri Sep 11, 2015 12:35 am
Hey,
I wonder if you could help me pinpoint the issue, probably with automatic transmission, maybe gears, transfer or even final drive.
I like to go off-road occasionally and few days ago in a forest I followed really steep log skidding trails uphill, quite long (maybe quarter mile long). It was not slippery, so traction was good.
I went in 4LO, ESP off and I made it to the top.
What was weird was how it went. It's hard to explain, but a dozen of feet it went normally (say, 3-4 wheel revolutions), then I heard like rear end would slip for 1 wheel revolution and vehicle movement nearly stopped. After few seconds, when I was afraid vehicle would totally stop, it kept moving for next few feet, for next few wheel revolutions...then everything repeated.
And so it went up to the top, repeating the above described behaviour regularly like in prescribed intervals all the way up.
I checked tires, pressure, with OBD2 for DTC codes...nothing wrong. Also wheels were not slipping.
As my understanding, what could slip is only torque converter, as this is the only component in drive chain which is not geared. Everything else is gear transmission and AFAIK cannot slip.
I have R51, 190.000km, ATF changed once few years ago and last year I changed 4 quarts of ATF (as that's what I had in my garage).
Any idea?
I wonder if you could help me pinpoint the issue, probably with automatic transmission, maybe gears, transfer or even final drive.
I like to go off-road occasionally and few days ago in a forest I followed really steep log skidding trails uphill, quite long (maybe quarter mile long). It was not slippery, so traction was good.
I went in 4LO, ESP off and I made it to the top.
What was weird was how it went. It's hard to explain, but a dozen of feet it went normally (say, 3-4 wheel revolutions), then I heard like rear end would slip for 1 wheel revolution and vehicle movement nearly stopped. After few seconds, when I was afraid vehicle would totally stop, it kept moving for next few feet, for next few wheel revolutions...then everything repeated.
And so it went up to the top, repeating the above described behaviour regularly like in prescribed intervals all the way up.
I checked tires, pressure, with OBD2 for DTC codes...nothing wrong. Also wheels were not slipping.
As my understanding, what could slip is only torque converter, as this is the only component in drive chain which is not geared. Everything else is gear transmission and AFAIK cannot slip.
I have R51, 190.000km, ATF changed once few years ago and last year I changed 4 quarts of ATF (as that's what I had in my garage).
Any idea?
