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

........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.

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.......:thumbs:

Lots of muscle cars had 4:11.........
 

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.

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 :- )

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

Those are good points Gordon. Thank you.

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?

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 :iagree: :thumbs:

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

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

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

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

Great setup in my mind if you want an automatic car. TH2004R or TH700 with 4.11 is a fine combo…….

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?

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