scrid

Hey fellow Yota'ers.
I have recently noticed some strange action in my 94 drive line when in 4x4 high mode. We recenlty have been getting alot of snow here in eastern NE, and I have been using the 4 wheel high quite a bit. I have noticed when I pull into my driveway...which is flat by the way,... that... right after i turn the engine off the whole driveline seems to lurch a bit. Or a similiar note is when i "sometimes" pull into the driveway and come to a stop in 4 high mode I can feel the driveline kinda tighten up and bog the truck down a bit before coming to a complete stop. If I shift out of 4x mode the driveline goes "chunk" and the truck does the same kinda lurch. It feels like it's the front end causing it. Any one else had this kinda problem?

bruzer

Does it do it in 2wd?? or only in 4hi?? Sounds weird to me, never heard of a vehicle doing that before. Never had the problem myself either but then again I never use 4hi.

scrid

only in 4 wheel

joea

Mine does the same thing. Only in 4wd.

scrid

does it get that tight feeling too when stopping?

TNRabbit

If your driveway is cleaned off and you are turning in before you shut it off, you are binding up the 4x4. You need to unlock 4x4 before turning on any hard pavement or it will do that.

2_86's

I have a 22re in my 4runner so with the different transmission I don't know if this is relevant.

However-both of ours do exactly the same thing you describe, but oddly in my case, only when the 4wd hasn't been used for a while. I got into the habit of putting it into neutral before shutting the truck off which seens to lessen or eliminate this shock. (I always keep my foot over the brake when I do this-somehow expecting it's gonna jump forward anyway-never has though) I realize this is not a "fix" but I figure it's gotta be better than letting it lurch like that all the time.

My guess is what we are experiencing is all the driveline slack being taken up quickly then banging against the parking "pawl". Why it does that, well that I couldn't tell you.

scrid

TNRabbit I believe your right. I have noticed that it seems to do it when the front wheels are turning. So it's normal and just my operator error eh?
Does this apply to 4x low also?

89macrunner

scrid...this applies to any 4wd...it will bind up even worse in 4w low.


Your rig has does not have a center diff and all the wheels need to travel at the same speed or you will feel that binding like you do.

If you have a center diff it allows for proper distribution of power without binding..

i cant explain this that well but thats the basics of it...this is one of the first things my dad taught me when I learned how to drive

scrid

I understand. Thanks...this is the first 4x4 I have ever owned personally so I was curoius.

TNRabbit

ditto. 4x LOW will be MUCH worse. Don't turn hard in 4x4 on dry pavement, period. If you are driving on dry pavement in 4x4, it will cause incredible wear on your transaxle, transmission & differentials. Same principal as you only put 4 of the exact same size tires on a 4x4

FYI--no 2nd Yota has a center diff that I'm aware of...

Marc

Mine does the same thing when left in 4wd.

Endeavor

i also has this happen while in 4 high parking, i thought it was my tranny. exellent info i was goin to start a post on the same subject.

GSGALLANT

Just thought this may help a bit. I've been driving around in front wheel drive for the better part of a week (rear driveshaft removed and constantly in 4Hi). I noticed that when I put it in park, it will hold fine on a hill, but as soon as I shut the truck off, the park will "let go", and it will start rolling down the hill unless I put the parking brake on.

I haven't had a chance to pull out my transmission/transfer case manual to check, but I think that because the A340H is hydraulic actuated, the fluid pressure has to be present to hold it in 4WD. I'm guessing that as soon as the pump stops turning, whatever keeps the transfer in 4WD moves back to the 2WD position. That is probably the lurching that we all feel when shutting the truck off in 4WD (mine does it too, when the rear driveshaft is installed and when I'm in 4WD). I don't often post "guesses" on here, but this is all this one is... a guess. Seems to make sense, though.

Marc

Hey GSGALLANT - I think you're on to something.