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4X4 Help!!!!!

3K views 13 replies 6 participants last post by  cheapjeep 
#1 ·
Snowed 14" at my house,My 2002 Jeep Grand Cherokee Laredo 4.7V8 With Quadra Trac II, I Have 4-All-Time, Neutral, 4-Low.....So My front tires do not engage just my rear tires(RWD)...So my jeep goes no where in 4-All-Time.....But I put it in 4Low and IT engages all tires and i plow though the snow prefect!!! .........All fluids are good....no nosie.......Why wont my front tire engage in 4 all time......some time when i change from 4low to 4all time it will work for a few seconds??????
 
#2 ·
4 all time engages the front tires when they feel slippage, however power comes from the rear tires untill that slippage is felt.

4 low locks the front drive shaft so now your front tires are pulling and your rear tires are pushing... when slippage is felt the power transfers to the one with most grip.
 
#6 ·
4 low locks the front drive shaft so now your front tires are pulling and your rear tires are pushing... when slippage is felt the power transfers to the one with most grip.
Does 4LO still transfer power when it detects slip?

My 4LO (different TC) locks the front and rear driveshafts so they get the same power regardless of slipping or not. Just like my 4 part-time but w/ a different ratio in the TC.
 
#5 ·
hmmm well either way your front tires SHOULD engage when in 4hi... i would still advise to seek a mechanic to take a look at your rig. you def dont want to be driving around in snow thinking you're in 4x4 when you're actually in 2wd.
 
#10 · (Edited)
Sounds like the viscous coupling in the transfer case is shot. My understanding is that in 4hi the coupling varies power front/rear depending on slip. In 4lo it is bypassed and locks the front and rear driveshafts together, at a gear ratio of 2.72:1. There is no electronics in the WJ transfer cases or differentials. Here is the info from wjjeeps.com: http://wjjeeps.com/tcases.htm#QUADII
 
#11 ·
I do agree with Aaron. The progressive coupling is not doing its work. Did you check the fluid level to start with?
 
#13 ·
So the progressive coupling inside the T-case has a problem. The T-case has to be split to get access to it and i think that this coupling can´t be repaired, just changed. You could look for an other T-case at the junkyard, however you never know what you get. If you are handy, you could split the T-case yourself and change the coupling. No idea about the price though.
 
#14 ·
If indeed your 247 is bad you might want to consider a 242HD swap. This may be a cheaper alternative for you plus gives you the ability to have a locked 50/50 torque split in 4 hi part time,the same thing you have now in 4 hi full time without a viscous coupler and a 2 wheel drive option. http://www.jeepforum.com/forum/f310/jeep-wj-247-242hd-swap-510546/
 
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