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[ 7 posts ] |
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dbasile
Official CCB Member
Joined: Sun May 27, 2018 6:01 am Posts: 135 Location: Silverthorne, CO
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gear ratio help
I'm still collecting all the parts for the next major step for my bronco, full widths. I got a set of '79 F150 axles. Along with the axles I have a C6 and 203/205 double I am going to stuff in between the frame rails. Since the drive line will lengthen then I will stretch my wheel base. My engine is a efi 302 with a RV cam.
My question is what would be the best gear ratio for the axles? For the time being I will be running 35 inch tires but soon to step up to 37s when money permits. My bronco sees mostly trails and rock crawling with a little around town driving.
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Thu Aug 23, 2018 11:44 am |
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Justin
Official CCB Member
Joined: Sun Oct 10, 2010 12:04 am Posts: 6198 Images: 0 Location: Lakewood
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Re: gear ratio help
I have a similar setup. Given the doublers I went 4.56 and would do the same on yours. Without overdrive i was spinning the engine faster than I would have liked on the highway. You'll have plenty of tcase gears to still crawl without 4.88s.
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Thu Aug 23, 2018 12:00 pm |
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ZOSO
Moderator
Joined: Mon Nov 15, 2010 5:58 pm Posts: 3906 Location: Henderson, Co
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Re: gear ratio help
The problem will be the 302. they just don't have the nads to overcome crappy gearing. you are covered in low range. But in reality I would go 4.88's with the jump to 37's. I have run 37's, 4.88's, c6, 205. I worked and the 203 would have made it even better. With the 4.88's if all fails you could hope on the highway and run 65(3k rpm'ish). the 302 will want that rpm. Most wheeling the 2:1 low of the 205 and 4.88's would wheel great.
_________________ Rob
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
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Thu Aug 23, 2018 12:58 pm |
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Jesus_man
Official CCB Member
Joined: Thu Nov 11, 2010 10:36 am Posts: 5984 Location: California
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Re: gear ratio help
I'd certainly target making your setup happy on the highway since your doubler will cover you offroad. Have you ran your numbers thru any of the gear calculators?
_________________ 1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow. http://www.ucora.org
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Thu Aug 23, 2018 3:03 pm |
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pgilbeau
Official CCB Member
Joined: Sun Jul 07, 2013 6:06 pm Posts: 639 Location: Falcon, CO
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Re: gear ratio help
My current set up is 302/ZF-5/Atlas 3.8 to 1 and I run 4.88's with 37's. I can run 75 mph on the highway with this set up. My crawl ratio is probably too low in first but I just use 2nd and have plenty. Since there is no overdrive in the C6 probably want to confirm with one of the calculators.
_________________ 1969 Bronco: Full widths, 3 linked front end, 37's, hydro-boost, 4x4x2 box, ZF5, Atlas t-case, and fuel injected 302
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Thu Aug 23, 2018 4:43 pm |
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Gunnibronco
Official CCB Member
Joined: Mon Jan 03, 2011 6:07 pm Posts: 4074 Location: Gardnerville, NV
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Re: gear ratio help
_________________ "America is at that awkward stage. It's too late to work within the system, but too early to shoot the bastards." – Claire Wolfe 74-AWB 98", ZF5, Atlas4, TGW HP1060 and HP1014 axles, ARBs, 37's, 3.5" lift-5.5" front coil springs, Tahoe rear springs, EFI 302, h-boost, York OBA, 4x4x2, custom dash & gauges 72 U15- Explorer Sport-Candyapple Red (1 of 141)
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Thu Aug 23, 2018 7:59 pm |
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dbasile
Official CCB Member
Joined: Sun May 27, 2018 6:01 am Posts: 135 Location: Silverthorne, CO
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Re: gear ratio help
Thanks Everyone for the input!
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Fri Aug 24, 2018 1:43 pm |
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