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Old 12-05-2012, 10:38 AM   #1
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460 c6 37's. what gears?

This is my first post since getting my 79 xlt ranger. It has the 351m c6 in it now with 3:50 gears. Its gonna get street driven a lot with occasional trips offroad and to the woods for camping/hunting. Maybe a 500 mile weekend trip here and there. I'm working on my 460 build right now and I'm building the motor to hit 500ftlbs torque below 2000 rpm. The c6 is notorious for sucking fuel but I'm keeping it anyway with a stock converter. My thinking is that with a torquey 460, stock converter with stock gears my RPM's will be lower and I can get better milage( I'm not hoping for much I know it's a 460)

my question is will the 3:50's get me better fuel milage wih a motor that has 500ftlbs of torque below 2000 RPM's. I'm thinking like a diesel guy!

Thanks.
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Old 12-05-2012, 01:34 PM   #2
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With that much torque keeping the revs down will aid in fuel economy. But honestly if you're runing a 460 fuel mileage should not be a concern. I'd shoot for about 1500 to 1650 steady state cruise...
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Old 12-05-2012, 01:44 PM   #3
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I agree about the mileage and a 460. I'm sure someone has ran the is combo. Just wanting to hear some feedback. Maybe the engine would live longer too?

Last edited by BIG GUY; 12-05-2012 at 01:46 PM. Reason: Posted accidentally befor I was done.
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Old 12-05-2012, 03:05 PM   #4
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the 3.50's will be great on the hwy, but stop & go traffic or pulling a load will probably remind you of the 351m again.500 ft/lbs.?sounds good already....how about some engine details?
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Old 12-05-2012, 04:19 PM   #5
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The engine is on the garage floor right now. Lol. I've been following some builds on the 460 forum and a 545 stroker is just the ticket for gobs of torque down low. I figured with this much torque I could get away with higher gears. For offroad I'm looking at the 205 doubler. I've built a few jeeps but a 79 bronco has always turned me on and now I own one!
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Old 12-05-2012, 06:48 PM   #6
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4:10's or 4:56's would give you best all around performance DD, offroad, and hauling
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Old 12-05-2012, 10:22 PM   #7
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4:10's
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Old 12-05-2012, 10:25 PM   #8
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you said 37s right? --> 4.56
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Old 12-05-2012, 10:35 PM   #9
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I have 3.55 in mine and a stock c6 converter. It's pretty darn nice. Don't need an overdrive to get decent mileage and the 460 has plenty of torque to take off even with a moderate load. I've pulled a trailer through soft fields in high range just fine. 4lo is still fast enough for the sand too.
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Old 12-05-2012, 10:42 PM   #10
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Roomate has a 429 in his ranger with 4.11's and 38's and is changing to 3.55's. On the highway he's at 3,000 rpm with the 4.11s
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Old 12-06-2012, 09:04 AM   #11
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JBG's hard-copy parts book has a gear ratio chart, showing rpms and tires. I just checked and they don't have it online, just hardcopy. The chart shows what gears to run for the optimum rpm range for the best fuel economy.

I'm got 35s...460...C6...Holley Truck Avenger....running 4.56.
I get 5 mpg.
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Old 12-06-2012, 03:29 PM   #12
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I know the gear charts are accurate for getting back to stock RPM's and such. But this is not gonna be a stock engine. For crawling work ill be running a 205 doubler.

What RPM's would I be at with 3:50's 37's and 60mph? Like I said, I'm building the engine to have peak torque very very low.
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Old 12-06-2012, 04:36 PM   #13
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I'm running 4.10's and 37's with a stock 351w and the cruising RPMs are a little better than with 35's but not by much I can give a solid number but I'm thinking right a round 2500 @ 65. I've got good enough power but I don't need to go fast anyway and it will pull a 5% grade with the cruise on loaded at 70MPH and still walk off and a leave land rover.
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Old 12-06-2012, 04:47 PM   #14
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Originally Posted by BIG GUY View Post
I know the gear charts are accurate for getting back to stock RPM's and such. But this is not gonna be a stock engine. For crawling work ill be running a 205 doubler.

What RPM's would I be at with 3:50's 37's and 60mph? Like I said, I'm building the engine to have peak torque very very low.
RPM = (Speed * Transmission Gear Ratio * Final Drive * 336) / Tire Diameter

Roughly 1900 RPMs.


Quote:
Originally Posted by Black_mamba
Roomate has a 429 in his ranger with 4.11's and 38's and is changing to 3.55's. On the highway he's at 3,000 rpm with the 4.11s
How fast is he going? If that's accurate, you'd need to do 80+ to get those RPMs with those tires and gears.
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Old 12-06-2012, 05:01 PM   #15
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i would still switch to 4.10's regardless.
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Old 12-06-2012, 05:44 PM   #16
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Thanks for the input. 1900 RPM's sounds great! That's will help with planning the rest of my engine build. Not that I'm drag racing but some of the drag guys that go from a standard 460 up to a stroker will put in higher gears and have a better et's. Apparently with massive amounts of torque down low higher gears can net better acceleration. I've been doing my homework on this and was looking to see If its been done for a driver.
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Old 12-06-2012, 06:51 PM   #17
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I would go with the 4.56 just for the simple fact that you have a 460 and if your like me you want to have that response off the line.
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Old 12-06-2012, 07:31 PM   #18
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I have a 460, C6, 3.50 gears,& 35's. The truck runs great. The 460 has no problem spinning both 35's from a stop....
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Old 12-06-2012, 09:40 PM   #19
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i would go 4.56.
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Old 12-06-2012, 11:05 PM   #20
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Dumb post, really ??? High torque engine and U nwant 4.56-4.11.

3.73 would be max CAUSE a 460 is a low rpm engine high torque.


What are U gonna do in 4 low spin to 6000K !! Good luck with that !!


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