CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 19, 2014, 01:14:34 PM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
107514 Posts in 12506 Topics by 4810 Members
Latest Member: rustoleumm
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  General Discussion
| | |-+  Recommended Rear End Ratio...
« previous next »
Pages: [1] Print
Author Topic: Recommended Rear End Ratio...  (Read 2636 times)
sdkar
Hero Member
*****
Posts: 654



View Profile Email
« on: May 17, 2006, 01:53:06 PM »

Okay, I am up in the air on a decision and looking for a consensus of what you guys think.  I have a 69 Camaro that is going to get a 502 Crate Motor, A Tremec tko 600 5 speed manual transmission and a Ford 9" Rear.  I am going with the Martz Rally and Road Race front subframe and a TCI 4 link setup in the back.  I have been given a choice of a rear end ratio.  Well, I have no clue at all what to tell them.  This car is going to be a daily driver and not raced.  I want something that leaves the line quickly bt will cruise nicely at 80-90mph down the highway.  I have been told anywhere from a 3:40 rear up to a 4:11.  I don't want too radical, but I don't want a dog either.  I am going to go with the majority of what you guys say.  So, you all get to help me build my car.  Tell me what you think and if so, why. 

Thanks for the help.

Steve
sdkar@bellsouth.net
Logged
gro51
Member
***
Posts: 225


68 SS/RS 350


View Profile
« Reply #1 on: May 17, 2006, 02:07:18 PM »

Daily driver you say?  3:73 would be a safe bet.
Logged

Joe
Schodack, NY

'68 SS/RS 350, M21, 3:73, Rallye Green, Black Deluxe Interior
McKenzieDave
Member
***
Posts: 84


View Profile Email
« Reply #2 on: May 17, 2006, 02:44:04 PM »

Which overdrive ratio did you order (.82 or .64)?  Which 502 is it?  Dave
Logged
sdkar
Hero Member
*****
Posts: 654



View Profile Email
« Reply #3 on: May 17, 2006, 06:49:31 PM »

502 Chevrolet Crate motor 502hp and 567 ft. lbs. torque.    The transmission ratios are as follows:  3.27:1, 1.98:1, 1.34:1, 1:1, and 0.68:1.



Logged
hotrod68
Hero Member
*****
Posts: 520


almost finished

rusticman48@aol
View Profile Email
« Reply #4 on: May 17, 2006, 10:54:49 PM »

I'd think with a 502 it would hardly matter Tongue. A little small-block needs deep gears to get the revs up, and that 502 is a torque pig! I ran mid-12s with a 400, Turbo 350 and 3:55 gears in a '68. I'd go with 3:55s  Smiley
Logged

HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior
My68SS
Member
***
Posts: 348



View Profile
« Reply #5 on: May 18, 2006, 12:10:40 PM »

3.55 is my vote, and even at that you will need a delicate right foot in 1st gear with that amount of torque, even on a dry road!
I certainly think that at anything greater than 3.73, 1st gear would become redundant Tongue

Some other guides are:
On an overall tyre diameter of 24", a 3.55 diff will give about 20mph per 1000 rpm in 4th [1:1]  and your first gear will give about 30mph @ 5000 rpm.
Logged

Rob
1968 L34/M40 SS
12 bolt posi 3.55
Build - 12C
JohnZ
CRG Member
*****
Posts: 4158


View Profile Email
« Reply #6 on: May 18, 2006, 01:31:03 PM »

I'd go with the 3.55 also - you'll have all the tire smoke you can handle in 1st and 2nd, and the equivalent of a 2.41 axle on the highway in 5th.  Smiley
Logged

'69 Z/28
Fathom Green
CRG
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.081 seconds with 17 queries.