To replace a TH350 with a Th400 you'll need a different transfer case and adapter OR the correct 400 adapter and a different input gear in the case you have (assuming you have a NP205). The 400 stuff is WAY harder to find. If you already have a 350, adapter, and transfer case I would rebuild the 350, get an external cooler, and install a temperature guage.
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'70 cab, '71 chassis, 383, TH350, NP205.
'71 Malibu convertible
'72 Malibu hard top
Center City, MN
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