The '48-'51 Chevy Truck Shop Manual lists on page 0-5 the recommended lubricant as 90 wt. I prefer Red Line Oil MT-90, as it is synchronizer friendly, and works well in older transmissions.

Others can probably help better than I on the questions regarding shifter sloppiness.

Doug

Last edited by drdoug; 05/10/2020 9:12 PM.

1947 2nd-Series GMC FC152 3/4-ton
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1953 Chevy Bel Air Sport Coupe Powerglide