What transmission are you using?
So all of this info leads me to a question or two. How much horsepower (approximately) does it take to turn a 12-bolt, or a 9-inch or any other rear end? My third members, once broken in, seem to turn relatively freely. I was surprised to read Mark's post that a car lost .2 just by switching to a Ford gear, that would seem like a fair amount of HP was involved. I have heard this before, but I have never seen it quantified and I have to idea what it takes to turn a rear gear.
Part of that .2 is due to the fact that the 9 is somewhat heavier than the 12 bolt as well.So all of this info leads me to a question or two. How much horsepower (approximately) does it take to turn a 12-bolt, or a 9-inch or any other rear end? My third members, once broken in, seem to turn relatively freely. I was surprised to read Mark's post that a car lost .2 just by switching to a Ford gear, that would seem like a fair amount of HP was involved. I have heard this before, but I have never seen it quantified and I have to idea what it takes to turn a rear gear.
Turbo 400What transmission are you using?
Assuming some sort of big block with the Turbo 400, I would go something in the mid 3's 3.36 or 3.55 nothing lower, the larger and more powerful the engine the less gear you need. If you're talking a small block I would be considering a Turbo 350 especially if its a 283 thats light on torque and then I would consider dropping down to a 3.70.Turbo 400
2500 stall or 3000 stall or something different?Assuming some sort of big block with the Turbo 400, I would go something in the mid 3's 3.36 or 3.55 nothing lower, the larger and more powerful the engine the less gear you need. If you're talking a small block I would be considering a Turbo 350 especially if its a 283 thats light on torque and then I would consider dropping down to a 3.70.