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Jul 21st, 2025 | | | | Joined: Jul 2006 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 92 | What would I have to do to put a 3spd in and take the 4spd out? Its a 1948 1/2 ton. Or maybe put in an auto? Eng. is still 216.
Thanks Virg | | | | | Joined: Mar 2005 Posts: 684 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 684 | I made the swap from 4 speed to 3 speed in a AD years ago. It is simle if you have a doner truck as you will need all the linkage including the steering gear mast jacket, to do it right.
Cleon
Last edited by 31,32,33; 09/02/2008 6:12 PM.
| | | | | Joined: Jul 2006 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 92 | I was thinking to go with just a floor shift. Would the tranny just bolt up to the eng.?
Virg | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The trans will bolt up but I wonder why you want to change. The 4 speed is a better trans. & 2nd gear is syncronized which you will use for a first anyway. They are not hard to o-haul if it has a problem & the final drive on the highway is the same.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | You will need a new floor cover without a shifter doghouse in it. You will also need to change the U-Joint on the drive shaft if you are keeping the original rear end. It will bolt right up on the engine side. I believe there is a pin on the bellhousing on some of the 3 speed trucks that is missing on 4 speed trucks.
Last edited by 4ontheFloor; 09/03/2008 12:43 AM.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | The trans will bolt up but I wonder why you want to change. The 4 speed is a better trans. & 2nd gear is syncronized which you will use for a first anyway. They are not hard to o-haul if it has a problem & the final drive on the highway is the same. My thoughts exactly... all that work for what? The SM420 is a rock crusher, a fully sychro 3-speed with an extra low gear for the three times in the next 10 years that you may actually need it... but it's there if you do. What's the point? | | | | | Joined: Jul 2006 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 92 | I guess that about settels it,,,I keep the 4spd  Virg | | |
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