[425HP409]

Originally Posted by Gmtruckguy92

Hey guys, have a 67 c10 with a freshly rebuilt 327 and it also has the 2 speed power glide tranny, the trans wasn't messed with when the motor was rebuilt.

I started noticing that while driving right before it shifts it acts as if its in neutral and the rpms go up then it seems to catch the gear and shift. Wasn't positive if it was due to the kick-down not being attached on the carb and perhaps its stuck or what the problem could be?

any advice would help!

I believe that you answered your question with your comment "Wasn't sure if it was due to the kick-down not being attached on the carb".... The "Kick-down" also has pressure control for the transmission upshifts. If it is not connected to the carburetor and adjusted properly you can have the exact symptom you are describing, and it will lead to transmission failure if not corrected. With it not connected and you accelerate, the transmission is not getting the pressure increased from the "Kickdown" linkage, and thinks that the throttle is at idle and will have low pressure, resulting in soft application of the clutches, and a "neutral" sensation and soft high gear engagement, which is detrimental to the clutches. If you reconnect the linkage to the transmission, make sure that the vacuum modulator has manifold vacuum to it, the transmission should operate just like it did before the engine was rebuilt. My 68 came with a Powerglide and it never had any problems while being used as a farm truck and hauling trailers filled with livestock. It is a very strong and durable transmission. Good Luck, and remember, it is Kickdown and Throttle Pressure linkage......
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