This 40 tooth long shaft speedometer gear is designed for 1976–1986 Jeep CJ5, CJ6, CJ7, and CJ8 models equipped with Dana 300 transfer cases. It is also compatible with select 1984–1991 Jeep YJ, MJ, and XJ models with NP231 transfer case. It is used to correct speedometer readings after changes to tire size or axle gear ratio. The gear installs into the transfer case speedometer housing and restores proper speed readings by matching your setup to the correct tooth count. Long shaft gears are typically used in earlier cable-driven speedometer systems found in CJ models. Refer to the speedometer gear chart shown in the Amazon listing to select the correct gear for your tire size and axle ratio. Proper gear selection depends on actual tire size and axle ratio. Tire sidewall measurements are often inaccurate, so you must verify your true tire height before ordering to ensure correct gear selection. Replaces 52068062, Interchange 18760.30 Fits: Jeep CJ5, CJ6, CJ7, CJ8 (1976–1986) with Dana 300 Also fits select Jeep YJ, MJ, XJ (1984–1991) with NP231 transfer case