Since everyone has a slightly different veiw I checked my 74 FSM, excact wording: 'All Chrysler cars equiped with manual steering use a recirculating ball type of sterring gear. This gear is permanently lubricated at the factorty and periodic lubrication is not required'. It does't even give a lubricant type.
Now I checked 'Fix your plymouth, by Bill Tobolt (1968), this is on rebuilding manual gear box. It says coat all parts with general purpose grease, then there is a set up section, then after instalation in the car it says to add SAE 90 multipurpose gear oil.
My Chilton manual for 65 to 74 Barracuda says the same thing word for word, except it has added this: 'There is no necessary service for 1974 models'.
I don't have any FSM's before 1974.
Quoting the 1972 Demon Owner's Manual:
"All Chrysler Corporation Cars equipped with manual steering use a recirculating ball-nut type of steering gear. The lubricant level of the gear should be checked twice a year and, if necessary, replenished with Multipurpose Gear Oil, SAE 90, until the worm gear is completely covered. DO NOT USE A PRESSURE GUN!"
I have a big block Duster 440 with a manual steering box. The headers are TTI 2" primary and while it's verrrrry close to the steering box it doesn't touch. I know that the header still heats up enough to disturb the box however because the driver side header is now coated in whatever leaked out of the steering box. It was red in color so it's hard to say what's in mine. Is there a gasket on top that can be replaced? Any and all help is appreciated. And I think I'll be sure to add grease instead of oil, thanks.