Not going into overdrive

[max93]

I Recently installed a CK Performance shift kit in my trans, now it will not shift into overdrive. What did I do wrong ? I'm sure it is something simple but would like to have an idea what to look for before I drop the pan.

 

[theCATman]

That the only symptom?
Is it shifting late or extremely harsh in other gears? You didn't get the linkage/shifter cam in the case a click off upon re-assembly?

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[max93]

I haven't noticed any other symptoms, but I have very few miles on it. I can manually shift into all gear positions so I believe the linkage is in the correct position. I also converted it to a non lockup converter at the same time if that matters. Also, not that it makes a differance , this is a retrofit into a 68 firebird. I should have just left it alone because it worked perfect before.

 

[TexasT]

Are you going by rpm? What makes you think it isn't shifting into overdrive?
Did you change anything in the 3-4 shift valve in the valve body? Are you sure you followed the instructions? Swapping a spring into the wrong valve is the only thing I can think of. I'd drop the pan and go back through each step to make sure.

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[Douglee]

I was having the same problem a while back and wrote the solution I had found, which seemed to center around one of two things; an incorrect spring on the 2-3 shift valve and/or a shaky seal on the governor shaft which was changed at the same time. I wrote about my experience back in January of 2013 on this forum, but I don't know how to copy it here. Same problem though, no overdrive.