700R4 ?'s

[lukecp]

I am once again considering making a serious modification to my truck. Right now i have a TH350. This would be adding a 700R4 automatic tranny, out of a '88 up GM car/truck. I have several questions:
1.How much will i have to shorten the driveshaft, and how much will i have to move back the tranny crossmember.
2.Will i have to modify the tranny crossmember to bolt a 700r4 to it?
3.Will my stock collum shifter work?
4.Will the 700r4 speedometer drive work with my speedometer?
5.Which would be better, a lockup converter or a non-lockup converter?
6.How much of a jump in MPG should i expect? I get 10-12 right now with 3.07:1 ratio gears.


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Lucas

"Another proud owner of one of the coolest trucks ever built"

drop_shift@hotmail.com

My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, roughly 300 HP thanks to a 204/214 duration cam, Edelbrock Performer intake and 1406 carb, headers, and 40 seires Flowmaster mufflers. Ochre with a white top. Lots of fun .