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#26 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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U will not be happy on the interstate with 4:11 with a 350 turbo!
My 71 with 305 and 700-r4 is 2300RPM @ 70 MPH. I have 20" wheels. Gas milage want matter because the exit's are close enough you can stop at each one to fill up! ![]() ![]() ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#27 |
Registered User
Join Date: May 2009
Location: Eliot, Maine
Posts: 1,314
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Re: 4:11 rear end ... Anyone?
on my 72 Burb C20 (307, 3 on the tree), i switched from the original 4.57 to a 4.10 gear (my truck has the corp/eaton axle that swaps like a Ford 9 inch). i'm not wasting any extra rpm's thanks to the solid connection of a clutch. at 60mph i'm turning 3,000 rpm, so highway driving still isn't much fun. i just bought a 3spd manual + overdrive on here and with the .7 o/d ratio i will be down to 2100rpm at 60.
the 3.07 is WAAAAY too soft for a truck unless you have a monster engine or a diesel, never tow and spend all your time on the highway. i would recommend something around a 3.42 AND overdrive for a highway cruiser. my dad's 99 burb (2wd) loves this combo. a 4.11 with overdrive will be better on the highway than a straight 3.07 and you get good pulling power. anyone with a turbo 350 trans should look into a 200-4r because it is the same length and it has a better o/d ratio (.67 instead of .7) than the 700-r4 which will be good with a steep rear gear like a 4.11. i would have gone this route with 72 Burb if it had been an automatic. Last edited by capev86; 01-27-2013 at 11:23 AM. |
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#28 | |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: 4:11 rear end ... Anyone?
Quote:
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#29 |
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?
If an overdrive unit like gear vendors was fitted, would that give you the best of both worlds?....keeping torque and good RPM's on the freeway.
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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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#30 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: 4:11 rear end ... Anyone?
when I had the 350/350 turbo I got 13 mpg and was around 3000 rpm as I recall. Then went to a 425 olds and 400 turbo and got around 11-12 mpg with the same rpm.
I also had a granny 4 speed with the 425 and got about the same mileage. Now get 15+ with the 425/700R4. I turn 2100 at 65 MPH. The tranny gets me out of the hole better than the 350 turbo or 400 turbo as well. I calibrated the speedo as well as I could each time by timing a mile and using calculators. These figures may be off a bit but they are close.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#31 |
Registered User
Join Date: Jan 2013
Location: biloxi MS
Posts: 36
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Re: 4:11 rear end ... Anyone?
you can always just run a taller tire to reduce the gear ratio
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#32 | |
Registered User
Join Date: May 2009
Location: Eliot, Maine
Posts: 1,314
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Re: 4:11 rear end ... Anyone?
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#33 |
Registered User
Join Date: Aug 2012
Location: Cassopolis, MI
Posts: 96
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Re: 4:11 rear end ... Anyone?
I would gladly trade you a set of 3.73 for your 4.11. I'm in Michigan too PM if interested.
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#34 | |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: 4:11 rear end ... Anyone?
Quote:
Your current 1st gear is what it is, no change You will have a new intermediate gear between 1st and 2nd if you choose to split all gears Your high gear will now have an o/d gear above it (i.e. the new high gear). So, to answer your question, your off the line performance is unchanged but your highway cruising rpms drop per the o/d ratio. You could IMPROVE low end torque multiplication and o/d cruising with a trans swap (if it has a deeper 1st gear, which most do) but a GV unit will not provide improvements on both ends of the spectrum, just the high gear end. |
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#35 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: 4:11 rear end ... Anyone?
Plus with the G/V splitting gears on a manual it is a clutchless shift like an automatic. That is great when you are pulling a load as it keeps the power on and the engine in the power band. You don't have the 1-2 hole that the low first of a 700R4 gives you.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#36 |
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?
Cheers for the info Jocko...much appreciated
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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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#37 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: 4:11 rear end ... Anyone?
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#38 | |
Registered User
![]() Join Date: Sep 2012
Location: Factory
Posts: 681
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Re: 4:11 rear end ... Anyone?
Quote:
I am in the boat as well. I have TH400 and 4.10 in my C20. I have been debating on tranny swap or re-ringing the rearend. My TH400 is solid and since the Dana 60 has the floating axles....I am leaning toward a higher gear for the back. To the OP....with my TH400 and 4.10 combo I am cranking out some serious RPMs to hold it at 60 on the freeway. |
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#39 |
Registered User
Join Date: Jan 2013
Location: Gordon,Texas
Posts: 48
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Re: 4:11 rear end ... Anyone?
ah Yes , I have a Original 80's Ford F350 Dually Rear end in my 69 cst 10 Its got Factory 4:11 Gears in it , I havent yet ran it on the road due to Engine swap so i Cant answer many questions about the ride
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Thinkin Dirty Ridin Purdy ![]() DropKick McCracken's Fleet: 1998 Chevy Silverado 1969 Chevy CST/10 Original paint Comin soon: 1967 C10 short fleet |
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#40 |
Registered User
Join Date: Jan 2010
Location: Grimsby, Ontario
Posts: 205
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Re: 4:11 rear end ... Anyone?
I would be interested in the 4.11 complete rear end if you want to sell. PM me if interested.
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#41 |
Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: 4:11 rear end ... Anyone?
hate my gear set up, sucks even for around town..... changing soon
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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#42 |
Registered User
Join Date: Sep 2012
Location: Shiprock new mexico
Posts: 22
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Re: 4:11 rear end ... Anyone?
thanks bud. would you suggest a rear end swap? i do have a 3.73 rear end that came out of a late 70's blazer just laying around. and i have a 3.07 my buddy would sell me for next to nothing. however i still would like to have a 5 speed (t5).. have one out of a s15 but idk if it would hold up to my 350. let me know bud and thank again for your imput.
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#43 |
Registered User
Join Date: Sep 2012
Location: Shiprock new mexico
Posts: 22
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Re: 4:11 rear end ... Anyone?
thanks bud. would you suggest a rear end swap? i do have a 3.73 rear end that came out of a late 70's blazer just laying around. and i have a 3.07 my buddy would sell me for next to nothing. however i still would like to have a 5 speed (t5).. have one out of a s15 but idk if it would hold up to my 350. let me know bud and thank again for your imput.
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#44 |
Registered User
Join Date: Jun 2011
Location: Taylorsville, Georgia
Posts: 482
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Re: 4:11 rear end ... Anyone?
I have 4.11 with turbo 400. Got to actually drive it today, for the first time. Has a built up 355. I went back roads on the way to town, turning 2300 rpm the entire way. Gas gauge didn't move a bit. On the way back, I got curious and hopped on the main road on the way back. About 14 miles of 55( roughly 3200rpm). I could look down every couple minutes and the gauge would have moved down a tad. And the screaming of the loud exhaust had my ears bleeding.
I've got to do something in the future, or stick to back roads lol Posted via Mobile Device |
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#45 |
Registered User
Join Date: Nov 2012
Location: Rising Star, Tx
Posts: 249
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Re: 4:11 rear end ... Anyone?
I've got 4.10's and a 4l80e. I'm hoping to be at 2600-2800 rpm @70 27" tall tire. I will know next month when I drive it. I'd do a gear vendor or an overdrive and be done with it.
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NAME: TRAVIS TRUCK: BRUISER 71 C/10 SWB 3.5/5" drop 4.11 GEARS. F.A.S.T. BBC 408 496hp/479ft/lb JAKES 4L80E TCI TCU PTC 10.5" 2800 STALL My build thread: http://67-72chevytrucks.com/vboard/s...30#post5779530 |
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#46 |
Registered User
Join Date: Oct 2012
Location: Greenville, Oh
Posts: 72
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Re: 4:11 rear end ... Anyone?
Here's a website that has an RPM calculator based upon transmission, tire size and rearend ratio combination.
http://www.chevellestuff.com/tools/rpm_calculator.htm |
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#47 |
Registered User
Join Date: Aug 2009
Location: North Bend, WA
Posts: 272
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Re: 4:11 rear end ... Anyone?
Tag
Posted via Mobile Device
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68 c20 build: http://67-72chevytrucks.com/vboard/s...d.php?t=358130 Club longbed ...cause girls like'em long!!!!! |
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