Well, removed the access cover and still did not find any tags, found one on the xfer case but that didn't help. Here's what I do know, 4 speed, standard H with Rev. right and down. Good positive firm gear engagement, (much better than the 14 in the grub). No access plate on the left side as shown on the hayne's illustration of a t18/98. Fill plug right side, appears at a slight angle(?), drain plug centered in front and bottom. This thing looks like its been in there since day one, but over 30 years any number of things could've been swapped, so I won't rule that out. Regardless of what it is, if it'll go in without too much headache I'll put it in the grub, unless I find something wrong with it once I get it pulled. Probably use the 20 just to get rid of the useless parking brake that wouldn't hold it on level ground much less a hill. New Question: ID tag on grub's rear has 4 88 on it, which I take to be 4.88's. Heap has 41 11, 4.11's??? If so, will the 4.88's work in the 74 axle?, not up on the tapered/flanged thing yet. Appreciate the information given so far, and hope that what I've posted ID's the thing.
If the wife didn't hate it so much, I might not love it so much.