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!
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!
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.
79 Bronco 6" lift, mild 460, and 3/4 tons----Sold
94 F150 4x4 302 zf5spd swap----run about
97 F350 Crew Cab 4x4 6" lift and 35" muds---work beast
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.
My 79 buildhttp://www.fullsizebronco.com/forum/...d.php?t=207864 - Aluminum 3-core radiator, Mallory 85 HEI conversion distributor, High Angle Driveline One Tons front and rear, JBFAB Twin stick shifter kit, True trac differentials front and rear, Yukon 4.56 gears front and rear, Moser Extreme 31 spline rear axles, Borgeson adjustable steering shaft and rag joint, 95 amp 3G alternator, Fireguy/RJM Tech upgraded headlight harness, and a ton of other crap!
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.
351W, ZF5-47, BW1356, 10.25/D60
FOTM DEC. 2011
"Quando Omni Flunkus, Moritati,"
When all else fails roll over and play dead.
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.