Re: 72 th350 np203 swap to th400 np205
It is all bolt up stuff. Remove the 350/203 combo. Bolt in the 400/205. The trans lines will bolt up with just a little manipulation. torque convertor will bolt up -no issues. You may/will have to drill the frame for the x-member moving back (that will probably be the biggest deal). T-case shifter hole will move back a little, so a floor pan cut and repair (covered by carpet). Shifter from column will bolt up with a small adjustment. Driveshafts both front and rear rebuilt. Overall it is a pretty easy deal
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