Two questions:
1. "Will this new gear ratio change anything as far as the transmission goes such as requiring higher revs to start rolling?"
Yes, but it is usually not a problem with the 3.55 conversion.
If you have an SM420 4-speed and a 3.08 rear, you might find that you will use first gear.
2. "Secondly I see a part number for axle Speedi-Sleeves.
" . . ' "I asked many people about the sleeves and was told they were not available and if they were they would not do the job."
What is the question.?
Speedi-Sleeves (or equivalent) are available. Deve gave a part number.
Part numbers have been posted by other here in older posts.
