This would be a great mod! Cruising in 4-low on moderate to easy trails, it would be nice if you had the option of keeping the trans from shifting down to 1st.
My 2002 Subaru will stay in 2nd no matter what speed you are going, when you select 2nd. When you select 1st, it will stay in 1st. When you select 3rd or 4th(OD), it will shift through all the lower gears based on how the transmission was programmed. This is how I'd like my 4Runner to behave.
I'll have to add this to my mod list, but I'm afraid it will be quite awhile before I get a chance to do it, since I have so many other mods that I want to do first, unless someone figures out the wiring and posts a how to!