Ditto on the GL-4. I have never drained only filled but couldn't imagine doing it with out a hand pump --- On Tue, 9/28/10, Bill Gmail <bbauer2000@xxxxxxxxx> wrote: From: Bill Gmail <bbauer2000@xxxxxxxxx> Subject: [tcb] Re: Tranny fluid? To: "tcb@xxxxxxxxxxxxx" <tcb@xxxxxxxxxxxxx> Date: Tuesday, September 28, 2010, 8:28 AM GL-4 only in my opinion but that is opening up a can of worms. Sta lube sold at Napa is correct. You can do it cold. Might want to loosen the fill hole first to make sure you can get it off. Plus it will help it drain. Buy a hand pump it will save you lots of headaches when refilling. On Sep 28, 2010, at 8:18 AM, Eric Woodall <ericthomaswoodall@xxxxxxx> wrote: I've never warmed it up. A wise man told me the Sta.Lube brand was the best. Sent from my iPhone On Sep 28, 2010, at 8:02 AM, 71Westy@xxxxxxxxxxx wrote: I need to change the tranny fluid in my 71 bus - does it have to be warmed up or can I just do it. Trey