This is a new very high quality and very correct second gear for the T-90 three speed transmission. This will fit the CJ2A, CJ3A, CJ3B, M38, M38A1, Wagon, Truck, and early CJ5 with the T90 transmission. This is a Must to replace in a rebuild. When the little teeth that line up with the synchronizer get worn, the transmission will jump out of second. This is a fix to a very common problem in the T90s.