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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!
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| | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | Does anyone know if a 69 dually rear end will fit under a 1940 1 1/2 ton?
I was thinking of upgrading to an sm420 behind a 261 and both are available locally. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy InMy40s, I don't think it will "bolt in", but I'm sure you could modify it to fit, good luck. | | | | | Joined: Dec 2006 Posts: 720 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 720 | If your spring perches are the same distance apart you might be good to go. If not, what I would do is measure the inside of the tires to make sure they will clear the springs first, and if so reposition the spring perches on the axle. Will probably need to get your drive shaft modified to fit the new dimensions, and I'd think your brake system may need a boost to push larger brakes on a later rear end. Just me thinkin out loud tho. 
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber" 2007 Chevy Avalanche 2020 Jeep Cherokee Trailhawk, 2005 Harley Davidson FLHTCUI I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P
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