https://cimg5.ibsrv.net/gimg/www.for...08b0f4a973.jpg

Thanks to everyone who has lent an opinion on this. At this point, I'm no closer to figuring out why the measurement seems off but I am closer to a game plan. I am certain of the front axle location. I had hoped not to have to reinstall the bed and rear fenders but if that's what it takes then...
I've attached a picture of my frame at the rear axle position. I've marked the center of the bump stop mounts and also the measurement back from rear of frame. The small bolt is at 110" back from the front axle (using these as frame squaring points). Seems reasonable that the axle will move rearward under load. Still not sure why the measure to the end of frame is off but..
I am interested in the opinions provided on moving the front axle position forward of Henry's original. I've heard of this but not sure if the 'better' location is built into the TCI installation dimension or if I need to do the math. I've sent the question off to the TCI Tech guys but no answer yet.
Does anyone have experience with a TCI MII install AND moving the axle forward? The TCI instructions give 20.5" back from the original front spring mount. So, does that put the axle in the 'right' place or would I use 20.5" - 1.25" = 19.25". No pressure for a response as I expect TCI will respond in the next few days.
Thanks!
Brian

Hate to say it but I trust no one when it comes to critical measurements like this, I always mock up the sheet metal to be sure. I would put the cab on and hang the fenders and bed, then you know what you are dealing with.

When I built my 47 cadillac I even mocked it up on the floor :)

http://i34.photobucket.com/albums/d1...%20rod/034.jpg

Just thought I would finish this off. Here's what I take away:
Front TCI MII - After a wait longer than I thought should be acceptable, TCI got back to me and verified their measurement would locate the front axle center line as on the original truck. They indicate it normal to move the axle 1.25" to 1.5" forward from this. Not sure why the instructions can not be clear on that but, problem solved (I chose 1.25" by the way).
Still can not decide where the rear center line was originally, but I got enough good advice that I will be patient and set the location after I get rear fenders bolted on temporarily.
As I mentioned in an earlier post, this is my first time on this (or any) forum. I got a lot of opinions and good advice. Appreciate everyone who waded in on the topic. I will definitely run things by the group next time I am baffled by something (probably sooner than I want to think).
Thank-you.
Brian

I feel your confusion. My TCI instructions said that the front center was 21'' and other TCI instructions I found online that said 20.5''. I called them for clarification but their answer didn't instil confidence as to which measurement was right. Good luck with everything, I'm sure you will figure it all out.