Jerry,
I'm not familiar with the inside mechanics of them, but the 5-Speed GMC's I used to drive could be shifted without the revs just perfect, unless they were a little old and needed some help, but the Road Rangers I have driven needed to be shifted just about perfect, especially downshifting and very simialr to the two-stick Brownie shifting we are talking about above.
One driver who was used to the sychronized 5-Speeds, started driving the non-sychronized 10-Speed we had. He got the rythem of up shifting real good, but I didn't realize it till I rode with him one day, he couldn't downshift it. If luck was with him and he kept getting red lights where he would come to a full stop, he was alright, but one day we took a corner and he was in about 9th and he needed to get back to about 5th and he didn't. We lugged along in 9th as I was panicing. I used to think to myself, one day this crankshaft is going to end up on the front seat. I went to look at the truck, which was for sale a few years later, and there was the crank, on the front seat.
Bill
