You can go with a Hydraulic clutch setup(can scavange one from a pickup realitievely easily)so you dont have the problems with complicated linkage, some(if not all) t56s have integrated bellhousings.
Shane
I understand your drooling love for the new generation of GM trannys. I've been looking at the 6L80 for a custom diesel I've been working on.
Not sure about sizes, but I've been told not be led into thinking its an easy swap. The computers in those trannys are onboard, but they still require all the computer inputs and more. Its like trying to adapt a 4L80E without the aftermarket support or anyone who knows the language to hack one.
It will happen someday; probably within the year. Some company will crack the computer, figure out how to get it to shift on its own, spend a few million testing their own, then offer it on the market. Until then I think the 6L family is just going to remain scary for most of us.
Provided its not too far from a stock engine, a 200-4r has an excellent close ratio spread, its lightweight, small, and has a nice .67:1 OD. If its a fire-breathing big block, 200-4rs are expensive to build at that level.
The 700r4 (although a fine tranny) is personally not one of my favorites. It has a fine 2-4 ratio spread, but the 1-2 shift goes from 3.06 to 1.63. Its horrible. I have a few 4L60Es (same basic tranny) and I hate them all. I've replaced one with a T56, another with a 200-4r, and the third one still plagues me. personal preference i suppose.
I've also heard of guys converting their T56 to a mechanical clutch. that would let you keep your stock clutch linkage and pedal and row 6 gears.
I'd strongly consider the 200-4r. It survived quite well behind 500-hp modified Grand National turbos, so it should be up to your 327. Usually monster torque is what kills them, so I rarely recommend them behind big blocks or in really heavy cars or towing applications, but in a small displacement car, do it and don't look back. You'll be happy.
I hope others chime in with some other opinions too....
It's been recommended by members & regulars on the Corvette Forum (http://www.corvetteforum.com) that C1 Corvettes (53-62) use really short driveshafts and they are at a steep angle. Any driveshaft shorter then regular will increase the steepness of the angle. This will put too much strain on the U-joints. So for that reason, I'm opting out of a OD unit...
chevy had an od 4speed in the early 80s behind the 6.2 diesels
Shane
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