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Long or Short Tailshaft for a TH400 to NP 208

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Bross82, Jul 16, 2004.

  1. Bross82

    Bross82 1/2 ton status

    Feb 11, 2002
    Likes Received:
    Spencer, MA
    if i convert to a TH400, do i need long or short tailshaft to install with an np208? also, would i need a different bell-housing and torque convertor to bolt up to a 305? i think the th-400 came off of a 454 which i plan on putting in in the next year or two (hopefully) but it would be hooked up to a 305 for now. thanks.
  2. Stephen

    Stephen 1/2 ton status Moderator Vendor

    Sep 15, 2000
    Likes Received:
    Carbondale Colorado
    It'll bolt right to the 305, and re-fit to the big block when you're ready. The shaft you need in the TH400 to hook to the 208 will stick out of the case by about 2.5". You'll need a 32 spline input gear in the 208 and the adapter housing from 208 to TH400.

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