Picking rear gears

Tc77

Tc77

Not-quite-so-new-guy
Sep 19, 2018
29
26
3
#1
The car is a 81 El Camino. Not sure on weight of the car. Motor is a 383 550 horsepower. 200r4 transmission with a 3000 stall.12 bolt rear. I am going to put on a set of et street tires 29.2 height.It is more of a street car then a drag car . For the question I have been thinking on using a set of 4.30 gears are these going to be to big on the street ?
 
Tc77

Tc77

Not-quite-so-new-guy
Sep 19, 2018
29
26
3
#3
It will see highway use. I did a calculator on it at 75 the rpms should be around 3200
 
lilbowtie

lilbowtie

Royal Smart Person
Jan 7, 2006
2,488
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Canton Mi
#4
Loaded question - All the parts of your combo should complement each other - cam, carb, intake, compression, stall, gears, and tire height. Check the calculator your using, you should be around 2600-2700
 
CaliWagon83

CaliWagon83

Royal Smart Person
Supporting Member
Nov 12, 2017
1,829
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Orange County, CA
#5
For me, 3.73 or 4.11 would be WAY too short, and 4.30, ridiculously short. If you plan on doing much freeway driving, I’d do like 3.23 or 3.42. I’m planning on going 3.08 for mine. Then again, I want loafing RPMs on the freeway.

Anything in the 4s is for drag racing, IMHO. I’d find some gear calculators online, and figure out what your RPMs would be for the speeds you’ll be driving most frequently.
 
Last edited:
Qdub24

Qdub24

Royal Smart Person
Sep 6, 2006
1,811
733
83
Columbus, GA
#6
"street" or highway- makes a big difference. 3.73 or 4.11 would be a "normal" pick.
With a 200-4R and 29" tires, my choice for a street car would be between either 3.73 or 4.11 as well.
 
bob64

bob64

G-Body Guru
Mar 30, 2017
701
629
63
Niagara Falls, Canada
#7
Wow ya want a block to block car with 4.30's. An 3200 rpm at 75 won't be able to hear yourself think. And then there is the thought if you ever put a smaller tire on it, say a 26", Lord thundering!!

You might want to rethink this say anything under a 4 to 1.
 
Streetbu

Streetbu

G-Body Guru
Supporting Member
May 22, 2011
860
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Central NY
#8
3.42 would be the best overall....
 
Tc77

Tc77

Not-quite-so-new-guy
Sep 19, 2018
29
26
3
#9
Correction 75 at 2700-2800. What I am more worried about is if I want to take a long drive down the highway and over heating the transmission by not keeping it over the stall. And getting the car to hook.
 
fleming442

fleming442

Geezer
Dec 26, 2013
5,476
6,079
113
#10
Correction 75 at 2700-2800. What I am more worried about is if I want to take a long drive down the highway and over heating the transmission by not keeping it over the stall. And getting the car to hook.
I ain't buying it. Something isn't right. My 4L60e is at 2500 at 80 on 26.4" tires with a 3.42
 

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