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Old 11-26-2019, 12:26 AM
Usaguy Usaguy is offline
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Join Date: Aug 2019
Posts: 949
Quote:
Originally Posted by Squiggle Dog View Post
The flex discs are cracking and due for replacement. The tunnel insulation is falling down and causing the front flex disc to rub on it. The three-piece driveshaft (another special 1991 model year feature)

all 350 diesel w126 had a 3 piece driveshaft.

while you have the driveshaft out check your U-joints for easy rotation and lube the splines before torquing back everything to a factory torque specs (at least one of the splines has to be moving while driving)

Quote:
Originally Posted by Squiggle Dog View Post
The differential vent is rusted and probably clogged. I should tend to it before the seals blow out from overpressurization.
Good idea also judging by the crossover pipe you have an ASD diff.

May require a special fluid and is a nice option in snowy climate (not so much in AZ unless in flagstaff)
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