Selling turbo 400 with Doug Nash overdrive attached to it. It's in my '69 C20 Suburban. Trans was freshened up approx. 5,000 miles ago when I installed unit. I ran across an LS conversion that I've decided to go with. The 454 is sold. Still driving it, so it's not a tranny sitting on the floor if you want to check it out. I never connected electric switch for it. Truck has 3.73's in it so I never bothered figuring out wiring. Wiring is long enough to go inside cab, but I don't know how to wire it. It did drop rpm by 600. Much nicer cruising at 2400 instead of 3000. Asking $900 for both. Near Sacramento.