What is the difference turbo 400 and turbo 350
400 is more heavy duty,
400 do not need kickdown cable
400 is def heavier more durable
400 uses more hp to turn. 350 is plenty for most applications.
350 has two different length tailshafts… 6" (shorter) and 9" (exact same length as 700r4). 400 has a different tailshaft that would require a different crossmember than both of the 350’s. As well as the stuff the guys above me said.