Tranny or transfer case problem
#1
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I have a 02 suburban 4x4. I just replaced the rear end. Replaced fluids and filter in motor, tranny, and transfer case. I was driving it for a few days and noticed the transmission was slipping. I checked fluid which was low and added to the full mark. A week later, at the stop sign I take off and it sounded like it popped out of gear. I let the rpms come down and it made a loud grinding noise and went back into gear. A few days later, same thing happened and only a mile down the road it seemed to grind down into 2nd gear from Drive.
Is this a transmission problem or could this be a transfer case problem?
Is this a transmission problem or could this be a transfer case problem?
#2
Super Moderator
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Sounds like it was trying to go into 4x4-lo by it's self. You probably have a NP-8 Case, and the reduction you mentioned (Drive to 2nd gear) is comparable to the 2.7 ratio.
Did you notice any of the Dash Indicators showing it was trying to change ?
Possibly if you were to transfer into 4Lo and back a few times, it may correct it's self.
Did you notice any of the Dash Indicators showing it was trying to change ?
Possibly if you were to transfer into 4Lo and back a few times, it may correct it's self.
#3
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Thanks for the info, I didn't notice any indicator lights on when it happened. I'll keep an eye out next time. I did, however, put the truck on jack stands and lifted the rear tires off the ground. All gears except for 2nd turn at idle. I had to gas a little in 2nd gear to get the tires turning.
Last edited by Truss101; September 8th, 2014 at 2:31 PM.
#4
Super Moderator
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Though your problem is a bit different than most Case shifting problems, most times lack of use allows the Fluid to get goopy. Many times a Fluid change and as I said before, shifting back and forth (in/out) 4WD-lo often gets things working again.
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