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FORD TRUCKS - PARTS AND SERVICE RECOMMENDATIONS 1 4 SPEED TRANSMISSION AND 4 WHEEL DRIVE TRANSFER CASE LUBRICATION - 1968-1969 F100/360, F100/250 4x4, P350/500, P3500/5000 and U100 S.A.E. 50 engine oil is used for the initial fill and refilling of 4 speed transmissions and 4x4 transfer cases. If cold weather transmission and/or transfer case hard shifting is encountered, the S.A.E. 50 engine oil should be drained and "Winter type" S.A.E. 30 engine oil added. Change the lighter weight S.A.E. 30 engine oil back to S.A.E. 50 weight when the ambient tempera¬ ture is above 30° above zero.