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Jul 21st, 2025 | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | 1961 GMC 1000 with v6
Does anybody know what was available for stock differential gearing that year?
Thanks a bunch!!
| | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Found the info I was looking for....thanks guys!!
Last edited by Mike_K; 09/20/2012 10:48 AM.
| | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Three ratios were available through those years:
•4.11 with an overdrive transmission
• 3.90 with a standard transmission
•3.38 with an automatic transmission.
| | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Three ratios were available through those years:
•4.11 with an overdrive transmission
• 3.90 with a standard transmission
•3.38 with an automatic transmission.
| | | | | Joined: Mar 2001 Posts: 1,181 'Bolter | | 'Bolter Joined: Mar 2001 Posts: 1,181 | Mike, If you have a DANA 44 pumpkin, you can drop down to a 3.23 gear set from Presion Gear $250.00 with all the barings. like I did. http://rides.webshots.com/album/570438270cjSEvE | | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Thanks!!
My info show it came with 3.90 gearing to begin with. Can you confirm that? | | | | | Joined: Mar 2001 Posts: 1,181 'Bolter | | 'Bolter Joined: Mar 2001 Posts: 1,181 | Yes, I had the same ratio I bought a carrier gear, a pinion and the associated barings. While you have everyhing apart, swab out the axle tubes with a laquer thinner and some old rags, blow dry. You can also use a copper scrubber pads on a long stick (broom or mop handle for some good scrubbing action. Staple the pad to the stick gong back and forth. Replace the axle barings. You'll hate yourself for not doing it while you cleaning eveything up. | | | | | Joined: Sep 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,363 | I've got a set of 3.07 gears out of a dana 44 from '60 2wd GMC. Seems that was the 'economy' gearing with the 305 & 1 bbl Holley.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | I found this online someplace, not sure if it is 100% accurate.
Three ratios were available through those years:
4.11 with an overdrive transmission
3.90 with a standard transmission
3.38 with an automatic transmission. | | | | | Joined: Sep 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,363 | I think that is true for the corprate / Eaton axle used in Chevy but not sure about GMC / Spicer / Dana axles.
Last edited by BC59; 09/26/2012 12:41 PM.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Any way for me to know on the GMC? Any stampings or numbers? | | | | | Joined: Sep 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,363 | Would have had a tag on one of the cover bolts, if that's gone, take the cover off, Should be stamped on the ring gear (or count teeth on ring & pinion).
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Nov 2004 Posts: 1,552 Shop Shark | | Shop Shark Joined: Nov 2004 Posts: 1,552 | Good stuff. Thanks for sharing. | | | | | Joined: Sep 2012 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2012 Posts: 45 | Would have had a tag on one of the cover bolts, if that's gone, take the cover off, Should be stamped on the ring gear (or count teeth on ring & pinion). Thanks!! | | |
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