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01-13-2019, 10:05 AM | #1 |
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Join Date: Jul 2017
Location: Greensboro, Georgia
Posts: 40
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12 bolt rebuild question
I am going to completely rebuild my rearend. Can someone point me in the right direction on best place to buy the parts. My truck is a 68 with a 6 lug 4.10 open diff. I want to convert it to 5 lug 3.73 Posi and I’m thinking about using Yukon parts. I saw online that they have a kit but includes drums and I’m converting to disc so I don’t want to pay for the drums. Seems like the duragrip is pretty good and affordable and I’m not trying to break the bank here just building a good solid driver. I don’t mind piecing parts together from different vendors if I need to. I’m open to suggestions and brands but like I said kinda economical since I still have to build the rest of the truck.
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1968 C10 2WD LONG BED |
01-13-2019, 10:58 AM | #2 |
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Re: 12 bolt rebuild question
Eaton trutrak and Yukon gears is hard to beat...can be bought thru about all vendors
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
01-13-2019, 01:01 PM | #3 |
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Join Date: May 2012
Location: horseheads,ny rust belt
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Re: 12 bolt rebuild question
just a fyi . with a th350 trans and 29.0 tire height you will only drop 300 rpm @70 mph from 4.10 to 3.73 . . . not knowing your combo i just used this as a test point .
so swapping gears might not be a most cost effective option . . . hope this helps . and good luck with the build .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
01-13-2019, 02:19 PM | #4 |
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Re: 12 bolt rebuild question
Here's what k30 is saying...use this calc to help....http://www.csgnetwork.com/multirpmcalc.html
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
01-13-2019, 02:24 PM | #5 | |
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Re: 12 bolt rebuild question
Quote:
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1968 C10 2WD LONG BED |
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01-13-2019, 03:12 PM | #6 |
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Re: 12 bolt rebuild question
I've got 4.10s in mine and love it...had another with 3.73s and it was fine...my dd has 3.42s and I dont like it for the fact that its always downshifting...truck I'm building now is getting 4.56s....
I like to keep my ls at around 2000rpm at 65mph...performance is good and no big effect on mpgs... What size tire are you running?...with the od trans you can run a lower gear just fine...the traction will be an issue no matter...but I'd go with a locker of some sort...
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
01-13-2019, 03:20 PM | #7 | |
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Join Date: May 2012
Location: horseheads,ny rust belt
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Re: 12 bolt rebuild question
Quote:
http://www.grimmjeeper.com/gears.html 2500 rpm @70 mph with 4.10 / 4l80-e / 29" tire 2270 rpm @70 mph with 3.73 / 4l80-e / 29" tire
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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01-13-2019, 03:22 PM | #8 | |
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Join Date: Jul 2017
Location: Greensboro, Georgia
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Re: 12 bolt rebuild question
Quote:
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1968 C10 2WD LONG BED Last edited by Byoung330; 01-13-2019 at 03:29 PM. |
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01-13-2019, 04:12 PM | #9 |
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Re: 12 bolt rebuild question
30in tire...me personally I'd stay with the 4.10s...but that's me...theres just about every combination of ratio and tire size used in these LS swaps...anything in the 3s would work also...just go with what you feel is good..
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
01-14-2019, 09:42 AM | #10 |
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Join Date: Dec 1999
Location: Austin, TX, USA
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Re: 12 bolt rebuild question
Another vote for the 4.10 gears. I think that’s a sweet combo with the 4L80 gear ratios. The only caveat is if you plan for coast to coast type travels unloaded I’d go the 3.73 for the lower highway rpm.
But 4.10 for all around performance usage.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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