Auto transmission shift points

[Adam]

I'm working on a '66 Mustang with a 289 and C4 auto trans and need some help. The transmission is completely vacuum controlled, and as I'm at 6500ft, it shifts around 4100rpm. Can anyone tell me how to correct shift points? I should be shifting around 5500 rpm, with redline at 5800. Any assistance would be appreciated.



-Adam

 

[B.G. Smith]

Pull the hose off the vac. modulator and look in the hole, some of them are adjustable with a small screw driver. You would want to back off on the screw to make it shift sooner I think. bg