4.11 regrets
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Elder User
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From: midwest
4.11 regrets
i changed the 2.75 in my 78 f150 to a 4.11. i think the 4.11 is to low and makes the engine rev out to fast. it has a 460 in it and it almost seems faster starting in 2nd gear! i think this motor just likes to work hard and the 4.11 is not enough load to even open the secondaries. has anyone else used a 4.11 in their 460 truck with stock size tires and 2wd? it might just be faster with a 3.50 gear. the other problem with the gear is at 45-50 mph it used to kickdown to 2nd and take off at about 1/2-2/3 throttle now you have to be going under 35 to kickdown and its slower staying in 3rd at that low of a speed. i think a 3.50 should work the best and i wont get passed by everything on the interstate! any thoughts are appreciated.............
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From: USA
What transmission do you have?
I had 4.10 gears in my old Chevy dually with a 454 and TH400, stock tires. It pulled hard and had lots of power. I cruised on the highway at descent speeds, not real fast, but not poking along either.
4.10 is a working gear, not a high speed cruising gear. It is intended for pulling heavy trailers, climbing long steep grades, and 4-wheeling. Hook that truck up to 10,000 lbs on the hitch and you'll love the low gearing
.
In my F350 with a 351 and a C6, I run 4.56 gears with 33" tires. I like the pulling power it has and it hauls my camper and pulls my trailer up and down the mountains like a champ. Before I changed the gears, it had 3.55's and the truck was a real dog.
Low ratio gears aren't for everyone. If you're not working your truck with a load, but like to fly on the freeway at speed, you can get away with a higher ratio (numerically lower) than 4.10.
I had 4.10 gears in my old Chevy dually with a 454 and TH400, stock tires. It pulled hard and had lots of power. I cruised on the highway at descent speeds, not real fast, but not poking along either.
4.10 is a working gear, not a high speed cruising gear. It is intended for pulling heavy trailers, climbing long steep grades, and 4-wheeling. Hook that truck up to 10,000 lbs on the hitch and you'll love the low gearing
. In my F350 with a 351 and a C6, I run 4.56 gears with 33" tires. I like the pulling power it has and it hauls my camper and pulls my trailer up and down the mountains like a champ. Before I changed the gears, it had 3.55's and the truck was a real dog.
Low ratio gears aren't for everyone. If you're not working your truck with a load, but like to fly on the freeway at speed, you can get away with a higher ratio (numerically lower) than 4.10.
Last edited by SoCalDesertRider; Feb 23, 2005 at 08:16 PM.
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From: So Cal
All depends on what ratios are in your tranny.
My 94 F250 has 4.10 and tachs at about 2,000RPM at 60mph, probably low # ratio in the tranny plus overdrive. Some older trucks would probably tach at about 3,000 with that rear ratio, because the tranny had a higher ratio than the modern ones. I have a chebby with 3.08 that tachs at about 1,750 at 60, probably slightly higher # tranny ratio plus over drive. I had a 74 Datsun with I think 4.10 and it tached at about 3,000 at 60, guessing medium to high tranny ratio.
SO, high tranny ratio plus high rear ratio means high RPMS. Low ratio in both means low RPMs. High and Low who knows, but somewhere in between.
Just my simple minded explanation.
Jim Henderson
My 94 F250 has 4.10 and tachs at about 2,000RPM at 60mph, probably low # ratio in the tranny plus overdrive. Some older trucks would probably tach at about 3,000 with that rear ratio, because the tranny had a higher ratio than the modern ones. I have a chebby with 3.08 that tachs at about 1,750 at 60, probably slightly higher # tranny ratio plus over drive. I had a 74 Datsun with I think 4.10 and it tached at about 3,000 at 60, guessing medium to high tranny ratio.
SO, high tranny ratio plus high rear ratio means high RPMS. Low ratio in both means low RPMs. High and Low who knows, but somewhere in between.
Just my simple minded explanation.
Jim Henderson
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From: midwest
i understand the ratios vs. rpm. i have a c6 3rd gear is 1 to 1. i just think this particular motor (460) excelerates better low in the rpms cause of its tremendous amount of torque. lets say in a 1/4 mile i think the truck maybe faster with 3.50 then the 4.11, it sounds crazy but it doesnt seem to be working hard enough to open the secondaries and use its grunt down low. instead it just revs out to fast. any other thoughts or opinions?
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you're right in that it isn't working hard enough. it doesn't need the secondaries. RPM's are not the determining factor as to when the secondaries open. The primaries are delivering enough gas to get you going. Keep in mind that when you switch rear ends, you lost the equivalent of your 1st and half of your 2nd gear.
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From: midwest
my buddy is bringing me a 3.50 and i think ill try it when he comes out. i think the burnouts were 10X better with the 2.75 because the 4.11 just shifts into 2nd cause it tachs up so fast.
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i've got 4.56's in my '66. it's got a 4.9 inline 6. i never use 1st gear. it tops out turning between 3,300 and 3,400 rpms at 60 mph. i get about 7 mpgs. it seems to have unbelievable power, towed my friends 6,000 lb demo car like it was nothing, even starting out in 2nd.
i'm looking to swap in something like 3.23's. i don't usually haul anything more than 2 quads in the bed and some firewood now and then.
i'm looking to swap in something like 3.23's. i don't usually haul anything more than 2 quads in the bed and some firewood now and then.
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