1967 Select-A-Matic sometimes not engaging in any forward gear
I have a '67 MG Midget with a Mustang 289, Ford 8" rear axle, and a C4 Select-A-Matic in it, which I'm told came out of a '67 Fairlane GT. Every once in a while, I start the car up and it refuses to engage in 1, 2, or drive, but engages perfectly in reverse every time. It's not the dreaded "morning sickness," because so far it always engages perfectly in the morning when I first start it up. I could drive the car several times in the same day with no problems, but occasionally it just doesn't engage until it's damned good and ready to. Once I'm moving, it continues to work perfectly and shifts are quick and firm. It never disengages once it's moving. The only thing I can think of is the linkage feels sloppy, like the bushings are worn, but sliding from 1st through 2nd and drive, I would expect it to catch in one of them even if the linkage was sloppy. Fluid level is where it should be, and a nice healthy red color. Anybody have any ideas of what I should be checking to narrow it down?