Driveline Shudder (1973 GMC C-1500)

On 1973 C-1500 conventional cab and Suburban with Turbo Hydra-Matic 400 and C-1500 Suburban with Turbo Hydra-Matic 350 built before January 2, 1973, a driveline shudder during acceleration can be fixed by installing a 1/2" spacer between propeller shaft center bearing support and propeller shaft hanger. This spacer corrects driveline angle, eliminating shudder.

Fig 1: SPACER LOCATION SUBURBAN MODELS
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To install spacer, remove two mounting bolts used to attach center bearing to hanger; discard bolts. Install spacer between center bearing support and attach by using two new bolts, 7/16-14 x 1 3/4".

Fig 2: SPACER LOCATION CONVENTIONAL CAB MODELS
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