904 wont up shift

Guitar Jones said

Sounds like the kickdown linkage isn't adjusted properly or the ratio is way off. It should be all the way back at wide open throttle and maybe just a tad before it. Otherwise things that could cause it would be govenor or valve body valves sticking. If you adjusted the screw on the side of the valve body that hold the throttle pressure valve from coming out then you have effectively raised the pressure, this will delay the upshift no matter what you do to the linkage.

As there are a lot of mismatch parts there and I'm not sure how you put it all together you could also be losing pressure around the reaction shaft seal rings.

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Not mismatch, upgraded, modified, hot rodded, but definatly not mismatched.
Refrence an article in March 1998 High Performance Mopar called "Torque It Up" pages 14-15 and 78. Article talks about swapping in 2.74:1 low gear and 1.54:1 second gear in place of the stock 2.45:1 low and 1.45:1 second gear. Third gear remains 1:1. The parts are supposed to be found in an A999 transmission, but I discovered that some of the 78 and newer 904's with lock up also have the right gears AND had a 5 clutch high gear drum. SO now I have 5 clutches in my high gear drum, 4 in my second, and the gear ratio that in essence makes my 3:23's seem more like 3:55's in first and second gear but still give me highway milage of the 3:23's in drive.
As I have said though, drive comes in way late and I am worried that it may be doing it harm. I will try playing with the kick-down(thottle presure rod).
All I can say is when I get the bugs worked out, this is gonna be one hellaciously fun little 360 packed A body.

As to what you comment about the throttle pressure valve adjustment screw, I set it to what the Trans Scat performance kit instructions said to adjust it to, 1/8" between the valve and the throttle lever shaft piece that would other wise contact it. Does anybody else think that that might be wrong?