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| | | | Joined: Apr 2005 Posts: 5 New Guy | | New Guy Joined: Apr 2005 Posts: 5 | Is the 4 speed transmission the same on the 1/2 ton and 3/4 the same on the 1948 thrue the 1953 Chevy pickup? If the same, is the u-joint the same going out of the transmission? | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Both transmissions are the same, SM420.
No, the front u-joint is different on the three quarter ton than on the half ton.
DG
Denny G
Sandwich, IL
| | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | The transmissions are the same but different. The 1/2 ton units are set up for a torque tube, while the 3/4 ton units were set up for a driveshaft. I believe the 3/4 ton open driveline transmissions were used in the 1/2 tons starting in 54 or 55. | | | | | Joined: Mar 2004 Posts: 874 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 874 | 3/4 tons had a torque tube from the transmission to the carrier bearing on those years. Only the back half of the drive shaft was open. | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | also the big truck SM420 used a parking brake that was mounted to the rear of the transmission. | | |
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