Is it true that the CyRide 1983 Orion I 01.506 numbered 1408 (later 908) had the Detroit Diesel 6V71TA engine and Allison HT740 transmission?
According to the engine code in its VIN number (1) that you have here, it did. All other Orion I's in the CyRide fleet had the naturally-aspirated 6V71N (rather than the 6V92TA), even through as late as 1988.
1=Detroit Diesel 6V71TA
2=Detroit Diesel 6V71N
7=Detroit Diesel 6V92TA
~Ben