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Buick ST300 Transmission Codes:

Buick ST300 Transmission Codes

As shown in the illustration the transmission can be identified by either the metal tag or the stamping on the low servo cover. The metal tag is used on all 1964 and early 1965 units. For later 1965 and all 1966-69 the data is stamped on the low servo cover. The identification data includes the year of production, code letters or numbers followed by the transmission serial number. The model application is as follows:

BUICK SUPER TURBINE 300 CODE
1964 v-6-225 engine 25
V8-300 except station wagons 35
V8-300 Sportwagon 36
1965 V6-225 engine LJ
V8-300 except station wagon MJ
V8-300 Sportwagon MR
V8-400 Skylark Gran Sports NK
1966-67 V6-225 engine LJ
V8-300 except station wagon MJ
V8-340 Sportwagon MR
V8-340 except Sportwagon ML
V8-400 Skylark Gran Sports NK
1968-69 Sportwagon V8-350 except Sportwagon ME
6-250 LC