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#1 |
Registered User
Join Date: Jul 2010
Location: central michigan
Posts: 1,192
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4:11 rear end ... Anyone?
so, i'v got the chance to buy a complete rear end with axles with 4:11 gears and posi . i have a 350/350 turbo trans. would that rear end be not realistic for a cruiser? i want to be able to cruise around going faster than 60 mph and not have to worry about my rpms . anyone with a 2wd running 4:11 ' s?
thanks |
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#2 | |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: 4:11 rear end ... Anyone?
Quote:
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__________________
A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#3 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,861
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Re: 4:11 rear end ... Anyone?
You need to plug in rear gearing ... trans gearing ... and tire height. I know Ive seen someone post the formula before. I bet it turns up soon =)
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… … … … … … … … ... … … … … … … … … … … … |
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#4 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: 4:11 rear end ... Anyone?
I have 4:10s in my '68....but I have a 5.3L and 4L60E.....so its lots o' fun.
I wouldn't recommend it without OD |
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#5 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: 4:11 rear end ... Anyone?
If you were to run those gears behind a 700R4, it wouldn't be too bad on the freeways.
But, you're gonna turn some revs if you run it without an overdrive gearbox. It'll pull some stumps on the git-go, tho.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 4:11 rear end ... Anyone?
You'll be reving too high for most people's taste. (this is assuming you have a street truck with normal sized tires, and not a 4X4 with bug mudder tires)
Most people on here complain about 4.10/4.11 gears and would give anything to drop there cruise RPMs (put me in that group) |
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#7 |
Registered User
Join Date: Aug 2008
Location: KS
Posts: 268
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Re: 4:11 rear end ... Anyone?
I bet my dd has 4.11 or lower. It turns 36-3700 at 65 mph. I have had a lot of car/trucks with 3.73s and they seem to turn around 3k at 60-65 depending on the tire size. But I have a newer truck that I drive if I have to go on the hwy and I live in a small town so low gears are not hurting me, heck they may be helping my in town mpg. Dont have to give it as much thottle to get going.
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1970 SWB "old flame" 1967 SWB c10 sold 1972 Elcamino 496 2012 Denali HD dmax |
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#8 |
Registered User
Join Date: Jul 2010
Location: central michigan
Posts: 1,192
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Re: 4:11 rear end ... Anyone?
thanks guys
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#9 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: 4:11 rear end ... Anyone?
Great info ...
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__________________
A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#10 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: 4:11 rear end ... Anyone?
I just switched from 3.73 gears to 3.07 gears in my 68. I have a 350/TH350 combo. I went from 3400 rpm at 70mph to about 2500 rpm at 70mph. I'm fixing to take a trip to Nashville in it next weekend. It'll be nice to cruise at freeway speeds instead of chuggin along at 55-60mph like I usually do.
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#11 |
Registered User
Join Date: May 2009
Location: new braunfels, Texas
Posts: 41
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Re: 4:11 rear end ... Anyone?
I would gladly trade my 4.10's for some 3.73's, or replace my TH350 for a 700R4.
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#12 |
1972 C/20
Join Date: May 2005
Location: Santa Rosa, Ca
Posts: 273
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Re: 4:11 rear end ... Anyone?
I have a set of 3.5x's ready to replace my 4.11's. 60Mph gets the revs too high for my taste right now.
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#13 |
Love That '69
Join Date: Oct 2007
Location: Sherwood Park, Alberta, Canada
Posts: 360
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Re: 4:11 rear end ... Anyone?
My '69 has 4.56 gears with a SBC 327 and a TH350 combo. It turns around 4000 RPM at 70 mph. Id love to switch em out for some 3.73 gears in the future. My truck is a cruiser, that I drive a couple times a week to have some fun with and take to shows, so its not like its a daily driver. But it is a screamer on the highway! lol
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I AM CANADIAN!!!!! ![]() 1969 Chevy C/10 Truck - SBC V8, TH-350, 3.73 Posi, 1000W Rockford Fosgate Stereo System, B&M Megashifter, GT Grant Steering Wheel, Dual Magnaflow Exhaust System, Dynomax Headers, Lowered 1" Front & 3" Rear, Front/Rear Sway Bars, Racing Seats, 6000K HID Headlights 2008 Chevy Colorado LT - 3.7L I5, 4 Speed Automatic, Crew Cab, 4X4, Z71 Off-Road Package, "Ground Effects" Package, K&N Cold Air Intake, Supermod PTB, Magnaflow Exhaust w/ Resonator, 500W Kenwood / Rockford Fosgate Stereo System, Custom LED Lighting, 6000K HID Low's / High's, Blackcat Customs Gauges / Needles, Carbon Fiber Interior Accents, KrFabs 2" Lift Shackles / Torsion Bar Crank with Rancho RS5000 Shocks, Superskids Skid Plates |
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#14 |
Eat, Sleep, Drive a Chevy
Join Date: Apr 2010
Location: the town of the cow, Texas
Posts: 1,152
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Re: 4:11 rear end ... Anyone?
As stated above, if you change to an overdrive tranny you will be good, otherwise hope you are just cruising around in town. Gas mileage will suck or should I say the gas will be sucked from the tank rather quickly.
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Trey Silence may be Golden, but Duct Tape is Silver! 72 Short Step 57 "big window" short step |
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#15 |
Love That '69
Join Date: Oct 2007
Location: Sherwood Park, Alberta, Canada
Posts: 360
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Re: 4:11 rear end ... Anyone?
Oh I know...but my issue was when I rebuilt the TH350 tranny, I wanted to swap it for a 700R4, but I had to replace my driveshaft cuz its a couple inches longer. So I opted out of doing that at the time and just stuck with it. I get about 12 mpg and I mostly just drive it around town, but I live out in the country (15-20 mins outside of town), so I do some highway driving.
Somewhere down the road, when my engine needs to be rebuilt or replaced, ill maybe swap for a 700R4 and fix my driveshaft. But for now, im ok with what I got, ill just maybe swap out my 4.56's for some 3.73's eventually... I mean I have my 2.4L I-4 Chevy Cavalier Z24 as my daily driver...30 mpg
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I AM CANADIAN!!!!! ![]() 1969 Chevy C/10 Truck - SBC V8, TH-350, 3.73 Posi, 1000W Rockford Fosgate Stereo System, B&M Megashifter, GT Grant Steering Wheel, Dual Magnaflow Exhaust System, Dynomax Headers, Lowered 1" Front & 3" Rear, Front/Rear Sway Bars, Racing Seats, 6000K HID Headlights 2008 Chevy Colorado LT - 3.7L I5, 4 Speed Automatic, Crew Cab, 4X4, Z71 Off-Road Package, "Ground Effects" Package, K&N Cold Air Intake, Supermod PTB, Magnaflow Exhaust w/ Resonator, 500W Kenwood / Rockford Fosgate Stereo System, Custom LED Lighting, 6000K HID Low's / High's, Blackcat Customs Gauges / Needles, Carbon Fiber Interior Accents, KrFabs 2" Lift Shackles / Torsion Bar Crank with Rancho RS5000 Shocks, Superskids Skid Plates |
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#16 |
Registered User
![]() Join Date: Oct 2006
Location: Rochester, NY
Posts: 41
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Re: 4:11 rear end ... Anyone?
Im was running 4.56, now I have 3.73 with a rear tire 29". At 55-60 mph, its about 2500 rpm. Im even running with a gear drive and I dont think its bad.
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#17 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: 4:11 rear end ... Anyone?
you could change out the gear and pinion down to 3.73....that posi carrier will accept it with no problems....
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#18 |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: 4:11 rear end ... Anyone?
I'm a 4.11 user with a 400 & 454, and by the time i'm doing 50mph it's already starting to scream, I do tend to stay away from hwy driving because of the gearing, but it sure is fun on local streets pulling away from stop lights.
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#19 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: 4:11 rear end ... Anyone?
Quote:
and your TH350 is a stocker the ratio's are: 2.52 1st 1.52 2nd 1.0 3rd coupled with a 4.11 rear give final drive ratio's of: 10.56 1st 6.25 2nd 4.11 3rd which means you're turning 3127 rpm at 60 mph and 3650 at 70. That's a bit high and your truck is going to be very noisy. Switching to a 3.73 drops the rpm at 60 mph to 2838...not much of an improvement. A 3.07 rear drops you to 2330 RPM at 60 mph but your truck will run slower than a 20 year old Honda Civic with two broken sparkplugs. When I built my truck I used a 4.10 rear gearset with a TH400 which would have given me the same rpm numbers as yours BUT I added a Gear Vendors 0.7 : 1 overdrive so when I want acceleration it's set to 1:1 and the revs at 70 mph are 3640 but when I want to cruise it's set at 0.7:1 and the 70 mph RPM is 2551. All the difference in the world which is why some of the guys on this board like 700R4's. They will also give you the same effect as using a 0.7 :1 overdrive. |
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#20 |
Registered User
Join Date: Oct 2006
Location: lost angeles
Posts: 159
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Re: 4:11 rear end ... Anyone?
ratios are ratios so i'll relate this to my old 2000 tacoma. it had a 411 rear end with 31 inch tires (this was stock) in overdrive it would turn about 2200@70mph, in third (1:1) it would turn about 3000@70mph. so 411's with 31 inch tires are not that bad even without overdrive. i think the trick is to find the best rpm to get the best mpg. i do know that i would get 20 mpg in the tacoma all day long at 70mph but drop it to 55-60 and i could get 25mpg.
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#21 |
Senior Member
![]() Join Date: Jan 2011
Location: Bellevue, NE
Posts: 712
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Re: 4:11 rear end ... Anyone?
I'm running a 350/th350 with 4.11 posi and 235/70R15's which puts me at around 3200 @ 60mph. I'm having a guy rebuild a 200-4R (because it's a direct replacement for the th350) which will give me a .67 o/d and hopefully a little better mpg. I found this really cool calculator to determine what size rear will give you the rpms you want and at what speed. Just put in your target rpm and tire size and it shows your speed with different rear ends ratios. Here's the link: http://www.angelfire.com/fl/procrastination/rear.html
Cheers, |
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#22 |
Registered User
Join Date: Sep 2012
Location: Shiprock new mexico
Posts: 22
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Re: 4:11 rear end ... Anyone?
i have a 69 with the og 4 speed trans (1 gear granny) and i have to say i love my 411's , even more so when a ricer wants to throw down. but its my daily driver and i twist at 3200-3400 on the tack when im rolling 60-70ish. im loooking into a few diffrent oppitions , >1. change to 3.73's<, >2.t5 tranny swap<, > 4 speed munci or 400 turbo<
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#23 | |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,115
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Re: 4:11 rear end ... Anyone?
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#24 |
Registered User
Join Date: Jun 2011
Location: Taylorsville, Georgia
Posts: 482
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Re: 4:11 rear end ... Anyone?
Turbo 400 with 4.11 here. Haven't played around to much yet, so dont kill me if I get something wrong broke Speedo also. At 45-50 I'm turning about 2200. 65 I think is 3600 or so. Haven't been on a high way yet, with someone along side. Just been on the back roads with the new set up. I will be going 5 or 6 speed, though. Ive gotten (I think) 9-13 mpg with a really healthy 355
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#25 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: 4:11 rear end ... Anyone?
I might have missed it, but what are you running now for rear end gearing? You mention you want to run around over 60 - so I'll assume that would happen fairly often and on the highway. If you change nothing else in your truck, I would definitely not go to a 4.11. It just sounds cool to say it, it is not as streetable as a 3.73, and certainly not as highway-able.
If you post your tire diameter (or size), we can provide exact numbers. But my personal opinion, since you specifically mentioned highway driving as a goal, is that the few extra puffs of smoke you may eek off the tires with a 4.11 at a stoplight is not at all worth what you lose in highway cruising ability. I'm not saying it can't be done, I'm saying it's better with a higher gear, that's all. A much more streetable approach, that gives highway driving AND low end deeper gearing is an overdrive trans (o/d trans 1st gear ratios are normally a good bit deeper than TH400s and TH350s). May not be in the budget, but I'd save my $ before I sunk it in 4.11s. If you buy the 4.11s, then you'll need/want the o/d transmission just to make up for the rear end gearing on the highway and get back to where you were before you started. For all those posting your rpms at a certain speed - are you reading that off the speedos after a gear swap or with the non-original rear gearing? or a gps? Only the gps is correct unless you've changed the driven gears in order to correct the speedo reading. The calculations, like what Fitz posted, are really all that matters to give you an idea what you'll be looking at for driveability. 3500+ rpm might sound almost "doable" or "tolerable" but it is not fun on the highway after a few trips. Last edited by jocko; 01-27-2013 at 06:05 AM. |
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