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08-13-2020, 07:56 PM | #1 |
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Join Date: Feb 2010
Location: Dodge city Ks
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Rear differential help please
I am asking for your help or basically telling me what I need to do to get the most out of this truck. 68 C10, currently has a 4.8 ls engine backed with a 4l60e. The rear axle is stock with 373 gears. I am running 22x9 wheels and I’m curious if I need to consider changing gear ratios but have no experience with this area.
Anyone else running a similar setup that could give some advice? It’s obviously not a speed demon but I do want a quality built rearend that will handle any future upgrades. Am I asking too much?
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08-13-2020, 08:45 PM | #2 |
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Re: Rear differential help please
I wouldn't bother with the 3.73s and the overdrive
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08-13-2020, 08:50 PM | #3 |
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Re: Rear differential help please
It seems a little bogged down. What would you bother with?
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08-13-2020, 08:58 PM | #4 |
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Re: Rear differential help please
What size tires are you running?
The 4.8 is no powerhouse, but you may need a good tune...did you run it on a chassis dyno after your swap? The cost to swap gears isnt gonna be cheap, but 373s should be fine with a 4l60e..unless you have really tall tires
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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 |
08-13-2020, 09:15 PM | #5 |
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Re: Rear differential help please
Tire and wheel combo are roughly 31”
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08-13-2020, 09:22 PM | #6 |
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Re: Rear differential help please
You’re running about 2 grand at 70 mph.
Are you carbed or injected? |
08-13-2020, 09:38 PM | #7 |
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Re: Rear differential help please
Heres a rpm calc to help you out...
http://www.csgnetwork.com/multirpmcalc.html Your turning a little over 1800rpm at 65mph..with a 31in tire and a .7 od with 3.73s I try to set mine up to turn 2k at 65mph..seems to be the sweet spot for me. If you were starting from scratch I'd say 4.10s...since your already 3.73s I wouldnt waste the money to swap it But your 3.73s should be fine if you have a good tune..
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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 Last edited by mongocanfly; 08-13-2020 at 09:43 PM. |
08-13-2020, 11:33 PM | #8 |
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Re: Rear differential help please
Thanks for the calculator link, that’s handy. This rearend is leaking anyway and needs new seals, bearings, axle. The Way I see it needs rebuilt anyway. Is it worth going to limited slip?
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08-14-2020, 08:40 AM | #9 |
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Re: Rear differential help please
In my book,It's always beneficial to add a locker...the Eaton trutrac is one of the best....
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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 |
08-14-2020, 10:51 AM | #10 |
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Re: Rear differential help please
Trutrac is a great unit
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08-14-2020, 06:20 PM | #11 |
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Location: Temple City
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Re: Rear differential help please
On my 07 gmc with a 4.8 I ran 4.56, but if I had it to do over 4.11's or 4.33's would of been my choice. I had stock steel 17's though.
The 4.56's were not bad, and suited the truck well. Just ceuising over 75, a.d it was always wanting to down shift. |
08-14-2020, 07:40 PM | #12 |
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Join Date: May 2004
Location: Binghamton, NY
Posts: 3,461
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Re: Rear differential help please
Plus those wheels ain't helping any. I have 20s on my tundra and are HEAVY.
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08-15-2020, 12:16 PM | #13 |
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Join Date: Jul 2012
Location: Whitehorse yukon
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Re: Rear differential help please
Why such a tall tire on a c10 i can see taller tires on a k10 ?
C10 tire hits the range of 28.5 inchs tall usually |
08-15-2020, 01:22 PM | #14 |
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Join Date: Feb 2010
Location: Dodge city Ks
Posts: 620
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Re: Rear differential help please
Here’s a pic of the truck! Think I’m gonna try a trutrac, I’ve heard a lot of good things about them.
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