Where Were 4.11:1 Rear Differentials Used? - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Where Were 4.11:1 Rear Differentials Used?

Old 09-20-2018, 09:31 PM
  #1  
David Howard
CF Senior Member
Support Corvetteforum!
Thread Starter
 
David Howard's Avatar
 
Member Since: Jan 2008
Location: Easton PA
Posts: 9,876
Thanked 560 Times in 442 Posts
St. Jude Donor '10
Default Where Were 4.11:1 Rear Differentials Used?

I came across a 4.11:1 rear differential today with HD yokes on it and couldn't help but wonder where someone would use that ratio?
Wouldn't that keep the RPM's high even on a four speed car?
Would it work okay for a five speed or six speed transmission?
Probably give one heck of a hole shot to the car I would guess.
Let me know what you think.
David Howard
David Howard is online now  
Old 09-20-2018, 10:00 PM
  #2  
C3 Stroker
CF Senior Member
 
C3 Stroker's Avatar
 
Member Since: Oct 2004
Location: Youngstown Ohio
Posts: 2,793
Thanked 110 Times in 97 Posts
Default

........at the drag strip, or some spirited street driving. I have 4.11's in my car. Depending on your engine, you gear the car for the RPM you want to cross the finish line in a drag race.
C3 Stroker is offline  
The Following 2 Users Say Thank You to C3 Stroker For This Useful Post:
bmans vette (09-21-2018), David Howard (09-21-2018)
Old 09-20-2018, 10:41 PM
  #3  
bmans vette
CF Senior Member
 
Member Since: Nov 2006
Location: Athens GA
Posts: 18,148
Thanked 226 Times in 211 Posts
St. Jude Donor '12-'13, '15- '16-'17-'18
Default

Both my builds are 4.11s with T56 transmissions.

My 67 Camaro was stock 3.73 but I changed it to a 4.10 in 1969 for my Super T-10 4 spd and drag racing.

All depends upon use of car.
Ideal final ratio for 1st gear is 10.0 achieved by multiplying the first gear ratio of the transmission by the gear ration of the rear end.

I like the 6 spd match up with my 4.11. Will give me "holeshot" off line and highway cruising mpg in 5th and 6th.

Unaware of any "stock" 4.11 in our C3 cars. You will find them in trucks, heavy vehicles, etc to get them moving.
Early hotrodding days 4.33, 4.56, 4.88, 5.13 came out of truck rears and shoe horned into 12 bolt fixed axles in early 60's muscle cars.......
bmans vette is offline  
The Following User Says Thank You to bmans vette For This Useful Post:
David Howard (09-21-2018)
Old 09-20-2018, 11:07 PM
  #4  
EarlyC34me
CF Senior Member
Support Corvetteforum!
 
EarlyC34me's Avatar
 
Member Since: Feb 2017
Location: Pa
Posts: 398
Thanked 64 Times in 60 Posts
Default

Originally Posted by bmans vette View Post

...All depends upon use of car.
Ideal final ratio for 1st gear is 10.0 achieved by multiplying the first gear ratio of the transmission by the gear ration of the rear end.

I like the 6 spd match up with my 4.11. Will give me "holeshot" off line and highway cruising mpg in 5th and 6th.

Unaware of any "stock" 4.11 in our C3 cars........
mine came with 4.11 and m20 so first is 2.56x4.11=10.5216 in a LT-1. I guess we know how they planned to drive it
EarlyC34me is offline  
The Following User Says Thank You to EarlyC34me For This Useful Post:
David Howard (09-21-2018)
Old 09-20-2018, 11:16 PM
  #5  
Gold Dragon
CF Senior Member
Support Corvetteforum!
 
Gold Dragon's Avatar
 
Member Since: Jan 2017
Location: Seattle Washington
Posts: 449
Thanked 59 Times in 54 Posts
Default

My 68 C-10 1/2 ton was ordered with 4:11 gears and a four speed, heavy duty suspension and tow package. They had something heavy that they needed to move. Truck works well around town, and is very easy to roast the tires. Freeway driving leaves much to be desired. A 5 or 6 speed would be ideal for cruising speeds.
Gold Dragon is online now  
The Following User Says Thank You to Gold Dragon For This Useful Post:
David Howard (09-21-2018)
Old 09-20-2018, 11:19 PM
  #6  
Vette5311
CF Senior Member
 
Vette5311's Avatar
 
Member Since: Mar 2018
Location: Golden Colorado
Posts: 553
Thanked 64 Times in 63 Posts
Default Lots of muscle cars had 4:11.........

gas was cheap back then.
Vette5311 is online now  
The Following User Says Thank You to Vette5311 For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 12:27 AM
  #7  
gbvette62
CF Senior Member
 
gbvette62's Avatar
 
Member Since: Oct 2000
Location: Shamong, NJ
Posts: 8,955
Thanked 618 Times in 493 Posts
Default

My 62 has a 4:11 in it. It turns around 3000 at 60 mph, and with the 16 gallon tank, it doesn't go much more than about 100 miles between fill ups. I also have a 3:08, that I use to throw in the car, if I was planning a long trip. The rears are pretty easy to change in the early cars, and I could swap center sections in less than an hour.

A 5 or 6 speed would be nice, but I don't use the car much anymore, so I'll live with the 4 speed for now.
gbvette62 is offline  
The Following User Says Thank You to gbvette62 For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 04:09 AM
  #8  
c3_dk
CF Senior Member
 
c3_dk's Avatar
 
Member Since: Jan 2008
Location: Aarhus, Denmark
Posts: 3,211
Thanked 197 Times in 184 Posts
Default

For me a 4.11 rear end, is perfect with a TH200/700 or T5/TKO overdrive transmission.

Also with out a overdrive transmission, it's a Corvette :- )
c3_dk is offline  
The Following User Says Thank You to c3_dk For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 06:11 AM
  #9  
David Howard
CF Senior Member
Support Corvetteforum!
Thread Starter
 
David Howard's Avatar
 
Member Since: Jan 2008
Location: Easton PA
Posts: 9,876
Thanked 560 Times in 442 Posts
St. Jude Donor '10
Default

All great answers, thank you for responding.
I wound up putting 3.73 in my road race replica and a TKO five speed. Next race build might include the 4.11 and a six speed, will have to crunch the numbers.
Thank you again, appreciate the comments.
Best regards,
David
David Howard is online now  
Old 09-21-2018, 06:43 AM
  #10  
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Posts: 18,513
Thanked 132 Times in 111 Posts
Default

Highway speeds have also gotten much higher. We had 55 and some 65 mph speed limits and people actually did those speeds with maybe 5 mph above. So the engines were not turning quite as fast and gas was cheap. We now travel the highways at 80 to 90 mph. So OD transmissions Are a blessing in order to maintain some type of fuel mileage.
Gordonm is offline  
The Following User Says Thank You to Gordonm For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 06:47 AM
  #11  
David Howard
CF Senior Member
Support Corvetteforum!
Thread Starter
 
David Howard's Avatar
 
Member Since: Jan 2008
Location: Easton PA
Posts: 9,876
Thanked 560 Times in 442 Posts
St. Jude Donor '10
Default

Originally Posted by Gordonm View Post
Highway speeds have also gotten much higher. We had 55 and some 65 mph speed limits and people actually did those speeds with maybe 5 mph above. So the engines were not turning quite as fast and gas was cheap. We now travel the highways at 80 to 90 mph. So OD transmissions Are a blessing in order to maintain some type of fuel mileage.
Those are good points Gordon. Thank you.
David Howard is online now  
Old 09-21-2018, 09:23 AM
  #12  
Hammerhead Fred
CF Senior Member
 
Hammerhead Fred's Avatar
 
Member Since: Mar 2005
Location: Midlothian VA
Posts: 1,594
Thanked 100 Times in 91 Posts
Default

Originally Posted by EarlyC34me View Post


mine came with 4.11 and m20 so first is 2.56x4.11=10.5216 in a LT-1. I guess we know how they planned to drive it
Don't think you could order a 4.11 with a M20.
Best you could get with the standard M20 was a 3.70
OR
You needed a M21 to get a 4.11
You sure you don't have a M21 or a 3.70 rear?

Last edited by Hammerhead Fred; 09-21-2018 at 02:11 PM.
Hammerhead Fred is online now  
Old 09-21-2018, 09:43 AM
  #13  
resdoggie
1976 Blue-Green L-82 4-sp
Support Corvetteforum!
 
resdoggie's Avatar
 
Member Since: Mar 2011
Location: Some days your the dog and some days your the hydrant.
Posts: 2,773
Thanked 276 Times in 256 Posts
Default

I'm enjoying my 4.11/M21 combo. I only go through a few tanks of gas in the summer so I could not care less about my 10 mpg fuel economy.

Dennis, the rear end is working just fine!
resdoggie is offline  
The Following User Says Thank You to resdoggie For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 09:55 AM
  #14  
c3_dk
CF Senior Member
 
c3_dk's Avatar
 
Member Since: Jan 2008
Location: Aarhus, Denmark
Posts: 3,211
Thanked 197 Times in 184 Posts
Default

Originally Posted by resdoggie View Post
I'm enjoying my 4.11/M21 combo. I only go through a few tanks of gas in the summer so I could not care less about my 10 mpg fuel economy.

Dennis, the rear end is working just fine!
THIS
c3_dk is offline  
Old 09-21-2018, 01:40 PM
  #15  
DEAN A NELSON
CF Member
 
Member Since: Jan 2007
Location: Wood Dale IL
Posts: 66
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Originally Posted by c3_dk View Post
THIS
I own a 71 LS-6 and it is the M22 and with the 4:11 read end.
it was ordered that way by the first owner, as I have all the paper work for the car from day one.
when I do drive it.....I shift it like a 2-speed, one to four.

Dean
DEAN A NELSON is offline  
The Following User Says Thank You to DEAN A NELSON For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 01:55 PM
  #16  
v2racing
CF Senior Member
 
v2racing's Avatar
 
Member Since: Mar 2008
Location: Spring Park MN
Posts: 2,413
Thanked 203 Times in 180 Posts
Default

Originally Posted by gbvette62 View Post
The rears are pretty easy to change in the early cars, and I could swap center sections in less than an hour.
I used to have a 63 2 door post Biscayne hot rod back in the 70's, which had the same pumpkin differential as your 62. I broke more than my share of these rear ends and got pretty quick at changing them.


I have a 4.11 in my 75 Vette with a 700R4. It cruises very well on the highway and if you can get the tires to hook, it accelerates very hard.

Mike
v2racing is offline  
The Following User Says Thank You to v2racing For This Useful Post:
David Howard (09-21-2018)
Old 09-21-2018, 02:06 PM
  #17  
c3_dk
CF Senior Member
 
c3_dk's Avatar
 
Member Since: Jan 2008
Location: Aarhus, Denmark
Posts: 3,211
Thanked 197 Times in 184 Posts
Default

Originally Posted by DEAN A NELSON View Post
I own a 71 LS-6 and it is the M22 and with the 4:11 read end.
it was ordered that way by the first owner, as I have all the paper work for the car from day one.
when I do drive it.....I shift it like a 2-speed, one to four.

Dean
But that cen be fixed :- )
But a very nice car you have there !!!

My car is a # 69 L46 with M21 and 3.70 from the factory.
Last year I installed a T5WC 5 transmission with 0.63 in 5th gear.

https://shiftsst.com/articles/1968-1...perfectfit-kit
c3_dk is offline  
Old 09-21-2018, 02:08 PM
  #18  
c3_dk
CF Senior Member
 
c3_dk's Avatar
 
Member Since: Jan 2008
Location: Aarhus, Denmark
Posts: 3,211
Thanked 197 Times in 184 Posts
Default

Originally Posted by v2racing View Post
I used to have a 63 2 door post Biscayne hot rod back in the 70's, which had the same pumpkin differential as your 62. I broke more than my share of these rear ends and got pretty quick at changing them.


I have a 4.11 in my 75 Vette with a 700R4. It cruises very well on the highway and if you can get the tires to hook, it accelerates very hard.

Mike
Great setup in my mind if you want an automatic car. TH2004R or TH700 with 4.11 is a fine combo…….
c3_dk is offline  
Old 09-21-2018, 02:16 PM
  #19  
chazde3
CF Senior Member
 
chazde3's Avatar
 
Member Since: Mar 2013
Location: Lansing MI
Posts: 1,573
Thanked 158 Times in 151 Posts
Default

They were used where people wanted to have some fun!

We measure gas consumption in smiles per gallon, it is a Corvette after all.

That reminds me, David my rear end was a 4:11 when you had it rebuilt correct?
chazde3 is online now  
The Following User Says Thank You to chazde3 For This Useful Post:
Metalhead140 (09-22-2018)
Old 09-21-2018, 02:20 PM
  #20  
hope2
CF Senior Member
 
Member Since: Jan 2006
Location: Atlanta Georgia
Posts: 2,199
Thanked 100 Times in 83 Posts
Default

Used to troll around Long Island in my '57 Bel Air with a 4.88 gear, and 3-speed overdrive.
hope2 is offline  

Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: