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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: Aug 2010 Posts: 5 New Guy | | New Guy Joined: Aug 2010 Posts: 5 | I have a 49 GMC 3/4 ton truck which I believe the commercial diff in it. It has 8 hole wheels. Is there anyone that can give me some info about swapping out the 3rd member to about a 3:42 gear. My diff that is in it now is not a enclosed driveshaft. It is enclosed from the trans to the carrier brg, and open from the carrier brg to the rear end, all stock. Currently it has 4:56 gears.
Last edited by medic8492; 08/27/2010 2:07 PM.
| | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | I found a set of 4:11s out of a late 60s Chevy 3/4 or 1 ton, these were in the trucks with automatic trans. I have heard that the same vehicle but a Suburban had a ratio in the 3s. Best of luck. Oh BTW I ran a wanted ad here on the bolt and found my gears. | | | | | Joined: Jun 2000 Posts: 738 Shop Shark | | Shop Shark Joined: Jun 2000 Posts: 738 | Medic8492, Welcome to Stovebolt. If you go to Engine and driveline shop you will get a lot more help and as Jim said go to SwapMeetto see if you can buy some parts.Just going to General truck forum, you will be able to discuss this with more guys. Good luck! | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Welcome to the Stovebolt Medic8492. Your are now in good hands!!
| | | | | Joined: Aug 2010 Posts: 5 New Guy | | New Guy Joined: Aug 2010 Posts: 5 | | | | | | Joined: Aug 2010 Posts: 5 New Guy | | New Guy Joined: Aug 2010 Posts: 5 | | | | | | Joined: Jul 2010 Posts: 4 New Guy | | New Guy Joined: Jul 2010 Posts: 4 | If it is an Eaton rear end, I don't believe you can get anything below 4.11 My 72 K20 suburban has that combination.
Maurice
72 Suburban K20 350/T350/HO52
| | | | | Joined: Aug 2010 Posts: 5 New Guy | | New Guy Joined: Aug 2010 Posts: 5 | | | |
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