Classic gm veicles 1970 to 1972–what type of rear differentials (12 bolt) gear oil to use?

12) Check for leaks. 13) Attach high and low port adapters. 14) Fill with R134a using the retrofit formula/chart below. 15) Install the port caps. 16) Attach the retrofit label to warn future servicing technicians that the system has been converted to R134a. Calculate how much R134a to use

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