I'd really appreciate if someone can give me any advice on the strange
grinding/rattling sound I'm getting on my 98 Jimmy, 118000kms/auto trans.
This grinding/rattling sound occurs when I'm driving and the transmission
shift from 2nd to 3rd. It also can be heard but not as loud as I'm gently
pressing the gas pedal while doing around 60-70km/h. If I gently drive off
and slowly speed up there is no noise as the transmission shifts up.
Does anyone have any ideas?
You may have what was a common occurrence with these transfer
cases. The snap ring on the rear output shaft would break, which
allows the entire output shaft and internal components to move
enough that the drivetrain in the t/case jumps out of engagement
momentarily. Usually happened when you put a good load
on it (like accelerating).
That's one thing I would check out. If you catch it early, you
can simply install a new snap ring and away you go. If you
keep driving it while it makes that noise, you are simply
destroying components in the t/case.
You would remove the rear driveshaft, remove the four bolts that
hold the rear extension housing on, and you should see the snap
ring, or where it's supposed to be. It sits in a groove on the
output shaft on the rear side of the big roller bearing that
supports the output shaft.
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