What might cause rough 1st-2nd tranny shift other than low&intermediate servo gaskets

[12Ounce]

The "end cover" I wrote off is a vertical cover on the LH side of the engine compartment("rear" of tranny?). Aluminum (in my case) and about a foot-square ... several small bolts. Reusable gasket as I remember. The cover "covers" the main valve body. A number of small solenoids, thermal sensor, etc inside on top of valve body.

I'm no tranny expert either ... just been kinda lucky so far.

If you've already changed the seals on the 1st-2nd servo, I'll bet they're still good and don't need replacing.