oldblu49, as for "additive" to a transmission I may add that for Automatic's put a quart of 5-30 in it when you rebuild one. I have a friend who, along with his daddy, have built automatic's for over 40 years and has a super reputation. When I put my 700R4 in my 37 he advised met to put a quart in it. I questioned him on this and he informed me that EVERY tranny they did that the first quart that went in it was a quart in the torque converter...even when it was a bench job being picked up by customer. Long story short is that automatic fluid is mostly for keeping things clean with very little lubricant. The oil fills that need. Must work, they are considered the best around here. Let you know after I drive mine for about 20 years!
