transfer case engaging on deceleration

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Apr 26, 2003 | 10:12 PM

DUAL EXHAUST

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transfer case engaging on deceleration

1997 ford f140 4.6l automatic 4x4. I am getting a grinding gear type noise when I brake at a stop sign. The noise is comming from the transmission/transfer case area. It was just on occasion up until about 1 month ago. The Mechanical thought at first that my truck was trying to stay in 2nd gear (replace MLPS). But now he is beginning to think that my transfer case is trying to engage 4Low, as the gears are allowed to slide forward while braking, due to a worn our shift fork in the transfer case. My truck on has 73000 on it and I can't believe this would be the case. Has anyone else encoutered anything similar?

Apr 27, 2003 | 12:24 PM

kspilkinton

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Joined: Jul 2001

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From: South Kitsap County, WA

transfer case engaging on deceleration

I had a similar problem on an '82 F150, NP208 xfer case, with 93K at the time. The shift fork did indeed get worn through by a thrust washer and would try to engage the planetary gear set (4L) upon deceleration. The momentum felt by the xfer case internals would cause the parts not permanently mounted to the structure to push forward as the truck slowed.

While this was on an older truck, the design between the cases has not changed significantly as the years have progressed. It's a strong possibility that you may have this problem if it grinds while decelerating.

-Kerry

Apr 28, 2003 | 01:24 PM

KJKozak2

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Joined: Feb 2002

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From: Cleveland, WI USA

transfer case engaging on deceleration

I've never had that happen to a truck, but my 70s era Allis Chalmers 180 deisel tractor had that problem. Turns out the shift fork was bent and worn and allowed the gears to slide forward just like you describe.

Seems a little premature on your truck though.

Kevin K.