I 3 SPEED TRANSMISSION r I 1972 SPEEDO CHARTS g p For 1972 Speedo gear application refer to chart Locate rear axle ratio and corresponding tire size Refer to code chart with proper code letter for part number of driven gear adapter sleeve or key where applicable I I V DANA TRANSFER CASE CODE DRIVEN GEAR SLEEVE ASSY CODE A ADAPTER CODE ADAPTER A 3968030 16T 2396891 D 3925671 H 3906497 B 3968031 17T 2396891 E 3925673 JJ 3925669 C 3968032 18T 2396891 F 3950348 K A 3950352 G 3950350 L 3950354 I 3 07 3 40 3 54 3 73 I TIRE DRIVE DRIVE DRIVE DRIVE SIZE GEAR GEAR g GEAR V GEAR I 3964593 3964593 39M593 3964593 Driven Adept Driven Adept Driven Adept Driven Adapt G78 15 C G A D A I A L 8 00 16 5 A F A 4 E I A D A E78 15 B F IA L 4 B L78 15 B G B I F C F B E I F78 14 A E A A L B L 8 75 16 5 B F C F g B E I G78 15 0 R A F C F A I A N 8 16 5 O R A F C F B E A G78 14 F B E A B 5 L78 15 O R B G B F C F A F78 14 0 R I C G B E A B f 8 75 16 5 O R B G B F C F A 6 50 16P B G A E C F IA 6 50 16P O R A G C G I A E C F 6 50 16T B F AV E B E 6 50 16T O R A G B F A E B E H78 15 AI F C F B E A H78 15 O R A F C F A A Q 7 00 15 B F A E B E I 7 00 15 0 R B G B F A E BV E 4 7 00 16 I A G C G B F C F E I 7 00 16 O R A G C G B F C F 7 50 16 B G A E 7 50 160 R 4 B G C G A E A 7 00 14 B A F C E B I 7 00 14 O Fl B F A 4 A B a 00 1e s A ca A A 1 i B 19 5 O R I A A G B G A F 1 9 50 16 5 A G C G B F C F 9 50 16 5 O R A G C G B F C F 10 16 5 I C G A E A D 10 16 5 0 R A G C G A E A D 7 00 18 A G I A F E78 14 A E A B B L I 4 I 1 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL REV 5 79 A V 4 33 4 331 4 331