[special-K]

Buying sight unseen is a well known no-no that people seem to not worry about these days buying off of Ebay. They also always say "buyer beware". If you didn't get a good look you should have at least gone with more knowledge. Since you didn't already know, you could have used this site to find out real quick that these trucks never came with a TH400 in a 4wd. Then you would have know to ask about the "swap". Then you would have had inaccurate info given and have a bonafide complaint. You got a '72 K/20 built just like all the others. I've been driving K/20s with TH350s for decades and never had a single issue. I see no need for a TH400 in a K/20, other than bragging rights. And what bragging rights will you have, unless you are putting out far more extra HP than the 18 the TH400 is stealing? The TH350 has been doing what's been asked of it in these trucks for over 40 years and the trucks didn't get the great reputation they hve from being built anything less than great