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05-24-2013, 01:14 PM
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#1
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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What rear ratio
I am planning on rebuilding my other 10 bolt for the 73 soon. I have a Torsen T2R to put in it and 30 spline axles, should be bullet proof for the most part with what I plan on doing with it.
Currently the car has 3.42 in it but with an LSx based engine compared to the BBC I don't think that will be enough gear. I don't want to go too crazy high though.
I have to figure out what ratio to put in it. I am guessing either 3.73 or 3.9 gears. The car will have the LS1 T56, and a 26" tall tire, I think 274/40-17 right now, but I will be going to an 18 when I get the Fikse wheels and I am not sure what height tire I will run eventually, but it should probably be something close to what I had on the Solstice (245/45-18) when I put 18's on the Camaro. I think the 3.42 wont be enough with an LSx and a T56 with a .5 (right?) 6th gear
Opinions/Experiences welcome
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05-24-2013, 01:16 PM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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3.90
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05-24-2013, 01:18 PM
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#3
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Quote:
Originally Posted by WildBillyT
3.90
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Reasoning? If you have any. I am not sure how to pick
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05-24-2013, 01:26 PM
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#4
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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With my 28" rear tires I am doing 1500 at 60 with 4.11's. I think that's perfect for the highway. With 26" tires you'd get the same performance with 3.90s.
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05-24-2013, 01:34 PM
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#5
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Hmm, I was going to go with Yukon since my 3.42 is nice and quiet but they dont have a 3.90, so I have to pick someone else or go with 4.11.
I used one of the gear calculators. With a 27" tire and the .5 6th gear the 4.11 would be ~1682 at 65mph... that is a lot lower than what I thought it was going to be. Maybe I should just go with that
Last edited by PolarBear; 05-24-2013 at 01:37 PM.
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05-24-2013, 01:52 PM
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#6
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Join Date: Jun 2007
Location: Arm pit of the world... NJ
Posts: 2,676
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Everybody runs 4.11, I say you should go with 5.57 gears. You don't want to be like everyone else, do you?
Here's a quick link.
http://www.summitracing.com/parts/rmg-6901751/overview/
__________________
John
Last edited by Featherburner; 05-24-2013 at 01:53 PM.
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05-24-2013, 01:54 PM
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#7
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Yukon only goes to a 5.38 for an 8.5" GM
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05-24-2013, 02:15 PM
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#8
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by PolarBear
Hmm, I was going to go with Yukon since my 3.42 is nice and quiet but they dont have a 3.90, so I have to pick someone else or go with 4.11.
I used one of the gear calculators. With a 27" tire and the .5 6th gear the 4.11 would be ~1682 at 65mph... that is a lot lower than what I thought it was going to be. Maybe I should just go with that
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Yup. Go 4.11 then. Any lower numerically and I don't think you'd use 6th that often.
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05-24-2013, 02:15 PM
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#9
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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4.11s, its a 6 speed, dont be a lame
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05-24-2013, 02:17 PM
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#10
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Or go 2.73 for the lulz
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05-24-2013, 02:23 PM
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#11
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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4.11
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-24-2013, 02:26 PM
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#12
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,634
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Time for a D-60 and 5.13's. Be different!
4.10's should work fine. Might make traction in 1st interesting, though.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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05-24-2013, 02:28 PM
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#13
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Quote:
Originally Posted by The_Bishop
Time for a D-60 and 5.13's. Be different!
4.10's should work fine. Might make traction in 1st interesting, though.
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lol
I am not really going to be drag racing and if I do it will be on street tires most likely.
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05-24-2013, 02:33 PM
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#14
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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OK with the ~26.68" tire over the 25.7" the 4.11 will act more like a 3.96:1 according to the calculator over at Wallace Racing
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05-24-2013, 02:40 PM
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#15
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Looks like 275/40-18 is a size with a lot of offerings from tire manufacturers
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05-24-2013, 03:05 PM
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#16
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Join Date: Jan 2013
Location: Washington Crossing, PA
Posts: 51
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275/40/17 tire 4.10 gear, I'm doing 70 at 2000rpm in 6th
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2000 Camaro SS M6 #6244 of 8913
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05-24-2013, 07:57 PM
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#17
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Join Date: May 2012
Location: NJ
Posts: 143
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If you like the drag strip I would do the math and see how far I can get from each gear. (1st gear to rear gear to tire height to desired power band shifting RPM) and so on so you know where you will be on a 1/4 mile track or 1/8th mile. I hate shifting too quick and screwing 60' time or 1/8 mile cause I ran out of gear. Its reason I have 3.90 in my Vette with a 28" tire running a th400.
I am sure someone out there thought it through already.
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05-25-2013, 05:16 AM
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#18
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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I'm not a drag racer, so I don't think I need to go to that extreme.
Thanks though
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