I think it was on PB and AC trucks. If you only have PB, you can add oil on the front pass side. If you have AC and no PB, you can add oil on the rear drivers side. If you have PB and AC, the PB booster makes it difficult to get to the filler on the drivers side and the AC compressor brackets make it impossible to fill on the front pass side. This all applies to SB, don't know about the BB's.
Randy
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'72 Cheyenne. AC, PS, PB, Rear slider window, tilt. Light yellow (grapefruit yellow according to new sales literature from '72)
'56 Chevy short step V-8 (My dad bought it new!!)
'70 Olds 442 convertible
'70 Olds Rallye 350
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