| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,087 Posts1,055,985 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | 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. | | |
|
|
| |
