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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!
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| | | | Joined: Jul 2019 Posts: 2 Moderated | | Moderated Joined: Jul 2019 Posts: 2 | I've been searching the forums/web looking for concrete details on swapping out my crash box trans in my bone stock 41 GMC 3/4 ton for a newer synchronized gearbox. Probably an SM420, but I'm looking for whatever is the most straight forward swap. I can't seem to find any definitive answers on the following:
Will an SM420 bolt to my existing GMC bellhousing w/o modification? What part number should I look for?
Do I need to change out the clutch?
Do I need to modify the cab floor?
Do I need to move any crossmembers?
Do I need to change/shorten the driveshaft?
Do I need to change the ring and pinion? (no idea what ratio I currently have)
I don't care about highway speeds (it tops out at 45mph and that's PLENTY fast), I just want to increase drivability around town. Has anyone done this exact swap? Is it the same as a chev 216/235 to SM420 swap except no torque tube? I'm not finding the answers I need. Hoping someone can help me out with clear details and links to information.
Thanks!
1941 GMC 3/4 Ton
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