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  #1  
Old 01-26-2014, 07:07 PM
hoosierbighorn hoosierbighorn is offline
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Default Problem when in 4wd?

When I'm in 4wd, the truck doesn't roll when I put the truck in drive or reverse and take my foot off the brake. Can anyone tell me if this is normal?

More concerning... At times (in 4wd), it almost feels as if I am trying to drive with the parking break on when at speeds under about 15mph, meaning I take my foot off the gas and slow down much quicker than I should. This doesn't happen at all when in just RWD. I changed the front differential fluid hoping it would solve the problem, but no luck. Any ideas on what could be causing this and what I might check to fix? Or, is this just a normal trait of some 4wd vehicles? Thanks...
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Old 01-28-2014, 08:59 AM
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tjbiker031 tjbiker031 is offline
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Without tearing it apart, i would have to say it could be binding of gears, bearing smoked...etc..

I would probably take it to a good local differential specialist (NOT AAMCO!!).
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Old 01-29-2014, 11:59 AM
hoosierbighorn hoosierbighorn is offline
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Thanks for the input. That sounds the most logical - I may have heard a slight grinding sound when trying to diagnose, and a couple of the teeth did have a bit of discoloration - don't know if I would go as far as to say pitting, but something noticeable. I'll let the new oil work its way through for a bit since the stuff that came out was a bit cloudier than I would expect, and hopefully that solves it.

Any idea if there should be a magnet on the front diff cover like there is on the rear diff and trans? Wasn't one on mine and would think that if missing, that could contribute to the oil being bad. If not, would it be bad to add one for precaution?
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Old 01-29-2014, 10:47 PM
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Not to sound dumb, but was this happening on pavement or grass, or gravel...
the reason I ask is that the gears are not synchronized between the front and rear. Driving on dry pavement will cause binding and feel like you are hitting the brakes. Loose surfaces allow for the small amount of slippage that the tires require because the front and rear turn at slightly different speeds.
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Old 01-30-2014, 12:48 PM
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Well I think if it's anyone that sounds dumb, it's me... This is exactly what's going on - had it on on pavement since I had just changed the gear oil. Still will monitor as the oil didn't look good that came out, but I'm sure you're spot on with what's causing this. This is my first 4wd vehicle vs all-time all wheel drive so hopefully I get a pass for that one... Thanks!
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Old 02-01-2014, 11:59 AM
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Pass granted! It isn't something that is taught. I told the salesman when I bought my truck I wanted to try the 4x4 and he tried to have me put it in 4hi in the parking lot. He looked at me like I had 2 noses when I told him no I wanted to take it in the grass. now you know! Glad we could help
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Old 02-03-2014, 08:51 AM
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The magnet is under the ring gear on the bottom side of the housing. Sounds like to me the differential needs a rebuild....no way around it. The teeth should be smooth with no distorion at all.
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Old 02-03-2014, 10:54 AM
hoosierbighorn hoosierbighorn is offline
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Thanks for the input guys. I think it's operating properly based on the fact that I was driving on concrete, but probably will still pull it apart again soon when I get some free time. Not sure if I was paranoid when I "heard" something that didn't sound right or if there actually is an issue, but better safe than sorry! Will give me a chance to check/clean the magnet too...
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