Th-700 r4
dextron
700 R
Dextron-II jr
Most likely a 700R-4 But it might be a 4L60E
There were several different versions of the 1978 Chevy Caprice. However, the standard transmission for all Caprices of that year was the three-speed Turbo Hydramatic.
700r4 if its an automatic
327
hydraulic
87 octane
10 w 30
DOT 3
Should be a 700R transmission.