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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 77scottsdale, Apr 21, 2007.
will a 85 2wd th400 mount to a 77 th350 np203
Your asking if a 2wd THM400 will bolt to a NP203 that was behind a THM350? The 2wd 400 will not directly bolt to the 203, but I think you can change the ouput shaft and tailhousing to make it work. I don't think you can search as your not a member, but someone else should chime in also.
The input shaft is 27 spline on your 203 and you will need a 32 spline input. The TH400/203 set up has the shortest TH400 tailshaft of all and as far as I know there is no ther application that uses it. You will need to get more parts to make that 203 work such as the correct out put shaft for the tranny and the correct adapter for the 203 and the correct input gear for the 203.
there we go, thanks for clarifying my inept attempt at an answer Tom.
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