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Have a 78 grand lemans that we bought last year for the heck of it not knowing what I was going to do with.It has 35,000 miles on it and never seen a winter.My son wanted to keep it but it was to boring the way it was so here is where were at.Pulled the 305 and installed a builted 355 sbc new cooling system,new shocks springs and sway bars,new posi rear end with 373 gears,15 inch aluminum Pontiac wheels with 235-60-15 BFgoodrich TA radials.New painless wire harness and Auto meter gauges.The stock th200 is still in it.want to swap it out with something that fits in the place of this th200.A th350 or 200-r4 need help.thanks
 

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yes 6" tail th350 or 200r4 will go right in but trans mount is in different location than 200c but same output shaft splines and all

easy swap overall other than modifying either the crossmember or making a flat plate of steel to extend the location of the mount off the trans or crossmember
 
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