Shop › 128107 Image 1 of 1 128107 $375.00 Countershaft gear, first and reverse. TR4-TR4A-TR250-TR6 (up to CD21768). 128107, 847-100 Add To Cart Added! Countershaft gear, first and reverse. TR4-TR4A-TR250-TR6 (up to CD21768). 128107, 847-100 You Might Also Like Engine & Transmission Mounts, TR2 thru TR4A from $5.00 Front Hub Bearings and Seals from $0.25 129955 $13.50 516398 $750.00 Drive Shafts and U-Joints, TR2 thru TR6 from $1.35