Go to EarlyCJ5.com A complete section on how to read the vin's.
1960 CJ5 (Jeep)
The original MSRP was $2930.
Yes, a 1970 jeep cj5 does have the low range transfer case if it is a 4wd, however, not all 1970 jeep cj5s were equipped with four wheel drive.
Jeep didn't make a CJ3a in 1970.
Look on the fire wall to the left of the manual choke cable
there is no hidden vin.
1970-1986 should fit
the vin should be shown in the owners manual.
The vin #'s are on the dash and under the hood.
You will need a locksmith.
Get a free yearone chevelle catalog from yearone.com and it will tell you how to read your vin#.
I don't think you will find information for the 1970 edition, but total of 603,303 CJ-5s were produced between 1954 and 1983.