Due to request and a need to document pics before it's too late. Beginning in the 1956 model year the Heavy Duty T98-A became an option for models CJ-5 and CJ-6. I prefer to think about it this way... This was the very first and remains as one of the very finest rock crawling tramsmissions ever installed into any 4WD. With this transmission installed into the a Jeep the "rock crawler" was born ! In this very first pic we see an inside look at a 1956 T98 -A in original near pristine condition. Signs of severe internal wear typically occur on the rear toothface of the 1st/ Reverse sliding gear. The teeth will grind when jammed into the non synchronized reverse gear which causes broken and chipped teeth. This T98-A 1/st reverse sliding gear is one of the very finest I have seen. Left: Here you can see that it is in previously repainted but unrestored condition. Note the case bulge near the rear. All T98 and all pre 1980 T18 transmissions cases use this same case. With alll Jeep T98 and T18 cases the PTO port is on the left side Right: The 2 uppermost threaded lugs were used for non CJ applications and so they are plugged with bolts. Front: Note: the massive sized bearing retainer. The original front bearing (unseen) is an MRC 308 SG -2 The thickness is due to the need for a front adapter plate. The retainer also provides the socket for the clutch release lever fulcrum ball. The sleeve diameter of the bearing retainer accepts the standard Willys 134 clutch release components The maindrive gear pilot tip fits the standard 134 flywheel bushing 8-1/2" and 9-1/4" diameter clutches will fit onto the 15/16" / ten spline maindrive gear Rear Here you see the common Jeep 1-3/8" diameter 6 spline mainshaft. The T98's use a cottered nut to fasten the mainshaft gear where the later model T18's use an ESNA nut The countershaft and reverse shaft lock plate is bolted into place. This transmission was not designed to share lube with the transfer case. The large bushing seen on the mainshaft behind the mainshaft bearing is sealed. Original rear bearing is a large MRC 308 SG.