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Numbers that I use for renewing the NP200 are: Yoke seals - National 410308 x 4 (Double lip, double case heavy duty) Redi-Sleeve 99212 x 4 Shift shaft seals – National 6835S x 2, Redi-Sleeve 99076 x 2 Enjoy.

Good news! I've gotten into the habbit of sleaving and resealing the shafts on the t-cases of any M37 varient that comes into my yard as standard operating procedure... Amazing how much difference it makes, especially if you have a repowered truck and run down the highway often.