Oldcreek,
My incessant need for info turned up something that might be of interest. I found it on the wonderful Novak Transmission site...it is a quote!
"About SM420 Synchros:
The SM420 has a 1st-2nd gear synchro ring that is integrated into the 1st gear hub. As such, this ring does not come with our standard rebuild kit as does the 2nd-3rd & 3rd-4th rings. However, unless the transmission has seen a great deal of shifting from the compound 1st to 2nd, this ring should not see excessive wear".
Stuart
