Steering box - Which lubricant?

The old Mopar service manual recommends part # 2585318 which is Sure-Grip lubricant , multi-purpose gear oil SAE-90. The only other mention is "do not use a pressure gun as the high pressure may damage the seals".I know you started this thread over a month ago and you have certainly filled your steering gear by now but here it is anyway. Perhaps someone can benefit from it.