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Old 07-15-2012, 06:11 PM   #1
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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?
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Old 07-15-2012, 08:31 PM   #2
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Not to sidestep but doesn't the ZL1 have 3.73 already? would 4.10 or 4.30 help much?
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Old 07-16-2012, 10:41 PM   #3
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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.
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Old 07-17-2012, 04:11 AM   #4
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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?
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Old 07-18-2012, 12:10 AM   #5
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hmm. Maybe shorter tires would do it...
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Old 07-18-2012, 09:40 AM   #6
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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
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Old 07-19-2012, 01:07 PM   #7
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Originally Posted by 2012ZL1 View Post
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.
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Old 07-19-2012, 01:17 PM   #8
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Originally Posted by DangerZL1 View Post
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.
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Old 07-19-2012, 02:16 PM   #9
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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.
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Old 07-19-2012, 07:56 PM   #10
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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.
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Old 08-15-2012, 07:15 PM   #11
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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?
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Old 08-16-2012, 03:40 AM   #12
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Quote:
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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.
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Old 08-17-2012, 11:17 PM   #13
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Quote:
Originally Posted by RoketRdr View Post
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/
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Old 08-25-2012, 12:05 PM   #14
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No thanks...I like mine better.
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Old 08-25-2012, 03:27 PM   #15
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No thanks...I like mine better.
lol. just an option. yours is great when you have the file on your hard drive. just because I posted a link doesn't make it required....
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Old 08-25-2012, 03:49 PM   #16
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No worries. I prefer to have immediate access to my calcs on the laptop and phone rather than having to have internet access. Was just offering these guys an easy to use calc with ZL1 numbers already plugged in.
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Old 08-31-2012, 01:16 PM   #17
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What if you went the other way and used the 3.23 gear that is in the automatics, and tried to rev out third gear?
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Old 08-31-2012, 03:11 PM   #18
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What if you went the other way and used the 3.23 gear that is in the automatics, and tried to rev out third gear?
as long as you are at the top of whatever gear at the finish line you are maximizing your rear gear ratio. however, you may not be maximizing your transmission ratios.....which means you aren't maximizing your horsepower potential.
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Old 09-04-2012, 03:11 PM   #19
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Yeah I can see how that wouldn't be optimal in most situations. Could we tub the rear end so that we could fit bigger drag slicks back there instead of changing the gearing? How big do you guys think we could go?
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Old 09-21-2012, 11:10 PM   #20
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I still don't get why nobody makes a gear set for this...?
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Old 09-21-2012, 11:21 PM   #21
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I still don't get why nobody makes a gear set for this...?
The 1LE cars get 3.90's from the factory....that should be close enough to 4.10's for those who want them.
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Old 09-24-2012, 08:28 AM   #22
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Not to sidestep but doesn't the ZL1 have 3.73 already? would 4.10 or 4.30 help much?
The manual does. The Auto has a 3.23.

A change is not really necessary when you can already pull 1.4X short times. First gear is very short and shifts in the mid 20 MPH area. The longer gear will then help up top.

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Old 09-30-2012, 10:01 AM   #23
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The 1LE cars get 3.90's from the factory....that should be close enough to 4.10's for those who want them.
That may be close enough, but to have to buy them from GM would be a stupid price no doubt...
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Old 08-17-2013, 12:40 AM   #24
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Actually I see the gear set from the 1LE (22813040) is only 291.00 which ain't too bad. Only gives a 5 percent increase in ratio though. 4.30 would be better.
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Old 08-17-2013, 09:02 AM   #25
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1le gears do not fit the zl1 carrier. The only way to alter final gear ratio at this point is changing rear tire diameter.
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