SPEEDOMETER GEAR CHARTS TP151 1975 SPEEDOMETER GEAR CHART C 123 BLAZER JIMMY w 3 SPD exc CATALYTIC CONVERTER CODE DRIVEN GEARS SLEEVE ASM CODE ADAPTERS A 3987920 20T 345215 F 3950352 B 3987921 21 T 345215 G 3950354 C 3987919 19T 345215 H 3905497 D 398791 B I8T 345215 I 3925669 I E 3987922 221 345215 3 40 3 73 4 10 4 1 1 4 56 DRIVE GEAR DRIVE GEAR DRIVE GEAR DRIVE GEAR DRIVE GEAR TIRE SIZE 6261794 5261794 628I794 626 794 6261794 Drlvan Adapt Drivtn Adapt Driven Adam Drivm Adult DrIv n Adlvt G78 15 A E G78 1500R A E I E78 15 B C F L78 15 C B E I L78 1500R C B C F H78 15 A E V HTB I500FI A E 7 00 I5 C A G 7 00 1500R B B y 7 00 15 D A 7 00 1800R D A 6 50 15 C A G 6 50 1600R C B LR7845 C B E I 8 75 I5 5 B V C F B F 8 75 I6 500R B E G B F 7 50 I5 C B C H 7 50 SOOR C B E I 9 50 16 5 A E A F 9 50 B 500R A E A F 10 0046 5 A E A H I0 00 I6 500R A E A H WAREHOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORAT ON LT TRUCK 51 REV 2 83 4 s s 4 000 GROUP