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| | | | Joined: Jan 2021 Posts: 19 'Bolter | | 'Bolter Joined: Jan 2021 Posts: 19 | I want to verify what i have read on several post before i spent money. i have a 51 3600 with stock rear end 8 lug. From what i have read i can do a direct swap rear end with a 67-72 C20 rear end. Is that correct? Is the diff off set like my original? also do i have to make any adjustment to drive shaft? Thanks
1951 Chevy 3600
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | No. The complete rear end is not a direct swap. You can take the center section (often called a 3rd member) from the 72 on back & put it in the housing. The 67-72 C20 with v-8 & auto trans has 4:11 gear ratios. It is very desirable as it gives a better highway ratio. It is pretty rare though.
George
This belongs in the driveline section.
Last edited by Wrenchbender Ret.; 11/23/2021 3:55 AM.
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: Jun 2005 Posts: 168 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 168 | As stated above, the third members will swap between the housings. 3/4 tons had the option of 4.11 gears from '65-'67, and that changed to a 4.10 gear option from '68-'72. There's a good bit of them out there. I've found three in the last few years just paying attention to what's being sold in the yards and on marketplace. It's an easy procedure. You unbolt the axle shafts and slide them out about 6". Unbolt your driveshaft from the third member. Then unbolt and remove the third member. That third member is pretty heavy though.
Liquidated my projects
Now looking for a decent '47-'55.1 3100, 3600, or 3800
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Good idea to drain and replenish oil.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Jul 2014 Posts: 892 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 892 | Good idea to have some sort of jack available. At least a floor jack and another person. It's that heavy.
1951 3800 1-ton"Earning its keep from the get-go"In the DITY Gallery1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971. | | |
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