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You didn't perchance find out if there were any differences between the 1850 and Sprint auto boxes when you rebuilt them did you? Types 11 and 17 if my memory is correct. Reason I ask is that when I converted one of my Sprints from manual to auto I could only find an 1850 transmission and all I've changed is adding a transmission cooler.
If your 1st to 2nd change is almost un-noticeable, then mine needs a rebuild too!
Geoff
I have a few spare auto boxes and all the valve chest/box have the same number of 6005. The number of clutch plates was the same in both which I think is four but there is a thick spacer in the clutch assembly. I removed that and fitted an extra clutch plate and disc, the total thickness is the same to within 0.015' . the speedo drive is different; green for the 1850 and red for the sprint if I remember correctly.
some of the boxes have different brake bands, one of my boxes has two bands the same and the sprint box and two different styles.
I think to improve the smooth change up, it may require the bands adjusting, but when I took the pistons out of the servos I did find them stiff, hard rubber seals and full of gunge, one servo can be changed with the gearbox in the car but the other one is more difficult due to space restrictions.
Malcolm