I have a 1987 S10 with the 2.8l with 5spd, which has 82000 original
miles. I have a noise that occurs when I slow down and the clutch is
still engaged. It seems (hard for me to say exactly) to emanate from
under the engine or transmission. The noise ceases once the vehicle is
going slow enough. The noise has a medium pitch clicking and not a
groaning or whining, and sounds like something spinning that shouldn't
be. I know that's not much to go on, but would appreciate any ideas.
Try putting the Xfer case in neutral. Stick it in gear and let out the
clutch. See if the noise is still there.
If not, you can possibly eliminate the tranny out of the equation.
Try lifting all four wheels off the ground (safely!) and run it up - try to
locate the noise that way.
If it ONLY does it under deceleration when the gears are loaded, it could be
bearings in the tranny or transfer case.
Regardless, check the fluid levels in the trans & transfers. They normally
use ATF, but if they're noisy you can run about 20-40% gear oil. It'll make
for harder shifts when cold, but will help to shut it up a bit.
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