ZL1 GEARS...LOOKING FOR 4.10 OR 4.30 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2012ZL1 · 07-15-2012, 06:11 PM

What's the deal-ee-o? Can't seem to find any info on replacement gear sets for the ZL-1. Anybody got any ideas?

1st Gen Forever · 07-15-2012, 08:31 PM

Not to sidestep but doesn't the ZL1 have 3.73 already? would 4.10 or 4.30 help much?

2012ZL1 · 07-16-2012, 10:41 PM

Yup. Car wants to shift into 4th about 100 ft from end of track. running out of rpm in third,and not enough room to rev out 4th. I guess the flip side would be to rev it to 7k, but that seems dangerous.

DangerZL1 · 07-17-2012, 04:11 AM

What other GM vehicle shares this rear diff with the larger ring and pinion gear? If you used DRs with a slightly lower height would that drop the effective ratio down enough to force earlier shifts and avoid a gear swap?

2012ZL1 · 07-18-2012, 12:10 AM

hmm. Maybe shorter tires would do it...

*radz28* · 07-18-2012, 09:40 AM

If there is another ring gear that would fit, it might be from the 9.5-inch truck axle. It's a semi-floating 14-bolt (I think it was semi-floating...). However - ZL1's ring gear is 9.9-inches (9.8XX").

How about a taller DR? Redline ran a slightly taller Mickey Thompson DR on their car if I remember correctly. That might be worth looking into. It's in the current GMHTP. I think it was a 305/40/18 or something. It would require you to go with a smaller wheel, but it sounded like the tire was taller, which might be a solution.

If you rev' higher, it'd probably be a good idea swapping valve springs/retainers for valve float. ZR1 features forged slugs, titanium rods, intake valves, hollow exhaust valves and better valvetrain, and it's limited to 6600. I'm not saying you couldn't take LSA to 7000, but it was my understanding blown motors don't like being over-rev'd...

JMVHO. I wish you luck

RoketRdr · 07-19-2012, 01:07 PM

Quote:

Originally Posted by 2012ZL1

hmm. Maybe shorter tires would do it...

Depends on what end result you're looking for. You can go with a shorter tire which will give you a quicker ET or you go with a taller tire that will net a higher trap speed. I have a gear ratio, speed and tire size calc in an Excel spreadsheet if you would like to play around with the numbers to see what changing the tire size will do on your rpm's and speed. I've already plugged in the auto and manual gear ratios for the ZL1 as well as stock tire diameter. Shoot me a PM and I'll send it to ya.

RoketRdr · 07-19-2012, 01:17 PM

Quote:

Originally Posted by DangerZL1

What other GM vehicle shares this rear diff with the larger ring and pinion gear? If you used DRs with a slightly lower height would that drop the effective ratio down enough to force earlier shifts and avoid a gear swap?

What he said. Run a shorter tire on your DR's and it will cure your problem without swapping gears. Then back to stock tire diameter for fuel mileage and normal street driving.

2012ZL1 · 07-19-2012, 02:16 PM

I am already looking for wheels to use with drag radials, but so far can't find any for less than 350 a wheel which is a little steep for occaisional use.
I'm looking for 18" wheels that aren't too heavy.

hognutz · 07-19-2012, 07:56 PM

tire is probabably the way to do this if you still want to be able to throttle out of coners hard on street rubber.

4.10's or 4.30's are nice at the drags but in turns on street rubber you might break grip to easy. I had this issue on a mustang. I think that is why the GT500 went 3.31's.

All-American ZL1 · 08-15-2012, 07:15 PM

Anyone have an idea of what the smallest size would be that we could run? Any idea of what would be too small of a tire? And will an increase in horsepower affect what tire size we should choose?

NASTY99Z28 · 08-16-2012, 03:40 AM

Quote:

Originally Posted by hognutz

tire is probabably the way to do this if you still want to be able to throttle out of coners hard on street rubber.

4.10's or 4.30's are nice at the drags but in turns on street rubber you might break grip to easy. I had this issue on a mustang. I think that is why the GT500 went 3.31's.

They went with 3.31's so they could hit 60 mph in first, run 200mph and avoid the gg tax. Although I'm sure it does tame the power when coming out of a turn it wasnt the main reason.

Higgs Boson · 08-17-2012, 11:17 PM

Quote:

Originally Posted by RoketRdr

Depends on what end result you're looking for. You can go with a shorter tire which will give you a quicker ET or you go with a taller tire that will net a higher trap speed. I have a gear ratio, speed and tire size calc in an Excel spreadsheet if you would like to play around with the numbers to see what changing the tire size will do on your rpm's and speed. I've already plugged in the auto and manual gear ratios for the ZL1 as well as stock tire diameter. Shoot me a PM and I'll send it to ya.

http://www.f-body.org/gears/

RoketRdr · 08-25-2012, 12:05 PM

Quote:

Originally Posted by Higgs Boson

http://www.f-body.org/gears/

No thanks...I like mine better.

07-15-2012, 06:11 PM	#1
2012ZL1 CaRaHoLiC Drives: '12 ZL1,67 Cam,68 Biscayne 427 4 sp Join Date: Aug 2011 Location: B.C. Canada Posts: 1,701	ZL1 GEARS...LOOKING FOR 4.10 OR 4.30 What's the deal-ee-o? Can't seem to find any info on replacement gear sets for the ZL-1. Anybody got any ideas? __________________ 2012 ZL1 2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.

07-16-2012, 10:41 PM	#3
2012ZL1 CaRaHoLiC Drives: '12 ZL1,67 Cam,68 Biscayne 427 4 sp Join Date: Aug 2011 Location: B.C. Canada Posts: 1,701	Yup. Car wants to shift into 4th about 100 ft from end of track. running out of rpm in third,and not enough room to rev out 4th. I guess the flip side would be to rev it to 7k, but that seems dangerous. __________________ 2012 ZL1 2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.

07-18-2012, 12:10 AM	#5
2012ZL1 CaRaHoLiC Drives: '12 ZL1,67 Cam,68 Biscayne 427 4 sp Join Date: Aug 2011 Location: B.C. Canada Posts: 1,701	hmm. Maybe shorter tires would do it... __________________ 2012 ZL1 2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.

07-18-2012, 09:40 AM	#6
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,185 View My Garage	If there is another ring gear that would fit, it might be from the 9.5-inch truck axle. It's a semi-floating 14-bolt (I think it was semi-floating...). However - ZL1's ring gear is 9.9-inches (9.8XX"). How about a taller DR? Redline ran a slightly taller Mickey Thompson DR on their car if I remember correctly. That might be worth looking into. It's in the current GMHTP. I think it was a 305/40/18 or something. It would require you to go with a smaller wheel, but it sounded like the tire was taller, which might be a solution. If you rev' higher, it'd probably be a good idea swapping valve springs/retainers for valve float. ZR1 features forged slugs, titanium rods, intake valves, hollow exhaust valves and better valvetrain, and it's limited to 6600. I'm not saying you couldn't take LSA to 7000, but it was my understanding blown motors don't like being over-rev'd... JMVHO. I wish you luck __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

07-19-2012, 02:16 PM	#9
2012ZL1 CaRaHoLiC Drives: '12 ZL1,67 Cam,68 Biscayne 427 4 sp Join Date: Aug 2011 Location: B.C. Canada Posts: 1,701	I am already looking for wheels to use with drag radials, but so far can't find any for less than 350 a wheel which is a little steep for occaisional use. I'm looking for 18" wheels that aren't too heavy. __________________ 2012 ZL1 2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.

07-15-2012, 08:31 PM	#2
1st Gen Forever ZL1 #140 Drives: Camaros: 68 SS, 10 2SS/RS, 12 ZL1 Join Date: Mar 2008 Location: Arizona Posts: 594	Not to sidestep but doesn't the ZL1 have 3.73 already? would 4.10 or 4.30 help much?

07-17-2012, 04:11 AM	#4
DangerZL1 Drives: 2023 Black ZL1 Auto Join Date: Oct 2009 Location: FEMA Region 4 Posts: 2,935	What other GM vehicle shares this rear diff with the larger ring and pinion gear? If you used DRs with a slightly lower height would that drop the effective ratio down enough to force earlier shifts and avoid a gear swap?

07-19-2012, 07:56 PM	#10
hognutz Drives: 2013 ZL1 Join Date: Oct 2011 Location: tangent or Posts: 2,984	tire is probabably the way to do this if you still want to be able to throttle out of coners hard on street rubber. 4.10's or 4.30's are nice at the drags but in turns on street rubber you might break grip to easy. I had this issue on a mustang. I think that is why the GT500 went 3.31's. __________________ shopping for 2017+1le or zl1 2009 CTS-V -sold 2015 Hellcat-sold 2013 ZL1 -sold 2007 Z06- sold 2014 Chrysler 300 2011 Duramax 8" lift, deleted tuned

08-15-2012, 07:15 PM	#11
All-American ZL1 Chevy Power Drives: 13 ZL1 M6 #123, '98 Jeep Wrangler Join Date: Dec 2011 Location: Tampa Posts: 134 View My Garage	Anyone have an idea of what the smallest size would be that we could run? Any idea of what would be too small of a tire? And will an increase in horsepower affect what tire size we should choose?