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Jul 21st, 2025 | | | | Joined: Jul 2009 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 23 | Acquired a 4 spd from a 51 2 ton dump to replace the one in my 52 1/2 ton.
1st question is, are the gears the same?
2nd question. I heard that all I have to do to match it to my torque tube is to change the rear bearing retainer. Is this true?
Thanks for any help. | | | | | Joined: Feb 2005 Posts: 469 Shop Shark | | Shop Shark Joined: Feb 2005 Posts: 469 | Gears are the same just change the parts on the back of the tranny for your torque tube. | | | | | Joined: Aug 2011 Posts: 835 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 835 | Also change the speedometer drive gear. I think they will just swap, This will keep your speedometer/odometer true.
Kurt | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | The drive grear is mounted "on" the transmission output shaft (actually, I dimly recall that it is mounted on the u-joint yoke on an SM420 The driven gear is screwed into the transmission body, and the speedometer cable attaches to it. I think that some drive gears and driven gears can be mixed-and-matched, but they came as matched pairs. I have purchased speedometer adapters from the The Speedometer Shop to get almost perfect mph readouts on two trucks. Also, Bruce Bugay sold me a NOS one set of NOS speedometer gears. | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | The big truck transmission will have a parking brake assembly mounted to it. | | | | | Joined: Jul 2009 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 23 | | | |
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