C6 won't downshift when I put the throttle pedal to the floor
I just put a 429 Ford engine with the original C6 behind it in my dad's 1970 LTD. Before putting it in, I put a B&M street/strip shift kit in the transmission. It shifts perfect--nice and firm on both shifts, so that part worked out great. My expertise is in engines and manual transmissions, so this is all new territory for me.
The problem I have is that it won't downshift when I put it on the floor. The downshift linkage is adjusted right and engages fully, but it stays in high gear when I floor it. When I put the shift kit in I paid close attention to make sure the downshift lever still pushed on the pin in the transmission that it engages (the lever also springs back on its own like it should without the linkage to the carb attached).
Anyone have an idea what could be wrong?
I also need to adjust the shift point--at full throttle it shifts about 4000 rpm--about the time it starts to make power. How do I go about changing that to where it will shift around 5500rpm?
1970 LTD 2dr. HT 429 4bbl
1988 F-150 4x4 short bed 5-speed
1989 F-350 4x4 regular cab SRW with 7.5 and 5-speed