Who has the ZR1 gearset in their FI C6? How do you like it?

 

I had mine installed a few months ago, first gear is real tall making 2nd through 4th close toghether. I sometimes wonder if a set of 3.70s or 3.90s in the rear would have been better. I do really like that my rpms dont drop much at all in between gears. I guess to answer you question I do like them much better than stock. Mike

 

If top speed stuff is your goal, the ZR1 gearing is awesome. For 0-140mph Z06 and Z51 gearing is better IMO

 

I want the best of both worlds. I want to keep my Z51 1-4, and have a custom 5/6... 0.85 and 0.71

Who can make this happen ?

 

If you have T56 trans (standard equipment up to model year 07) then contact G-Force for custom 5th and 6th gear.


Mike

 

What about for the 08 and newer, T6061?

 

I believe RPM can make that happen.

 

Thanks all for the replies.

I've been thinking about ZR1 gearing for my (still uncompleted) project. The goal would be to make first gear hook better in my normal setup, which should be 700-850 rwhp with PS2 ZPs (yes, I know). The better top end gearing is also a plus.

Yesterday I got to drive a lightly-modded (headers, cold air, tune) ZR1. I felt that first was not too tall, and that it did, in fact, make the car more useable in first. So, that mostly took away my worries about it being too tall for stop&go traffic, etc. So I was just wondering what other guys thought.

As for my own project, the tranny will have to be a "Day 2" deal, as right now the focus is just getting it on the road. We're gettin' there.

 

I have a new ZR1 transmission coming for my build. However its going to be later this year before I have time to install all the goodies. I have a new forged LS7 with a TVS2300 on top making between 12 and 14 psi of boost. LPE completed a similar build that made about 750 at the wheels. Their engine didn't include any port work on the LS7 heads and mine does, camshaft profiles are similar, they are running 1 7/8 headers while I have two 2" ARH headers, so the combination is quite similar. I chose the ZR1 transmission for its added strength of the TR6060 plus I wanted the better gear ratios especially in 5th and 6th. Around here I can't use the taller 6th gear so having the lower 6th will make using 6th gear easier. The engine should have tons of low end torque for the taller 1st through 3rd gears, all in all its going to be a fun package.

I will be running stock 342 gearing out back. RPM built me a stout rear end with their 300M axles, I have a Driveshaft shop 1000hp prop shaft that is also going into the torque tube so the drivetrain should be stout enough. I have new 345 invos coming mounted on CCW C140s with a 19-19 wheel combination. CCW says I will have the first set of these C14s in 19" on all four corners since getting their new 19" forgings in stock.

I know there are many centrifugals making more but they don't make the torque off the bottom end as a TVS will, which will make this a real fun street car. My suburban has a 8.1L big block, and it has a large Whipple stuffing air into the engine, let me tell you that truck flat hauls for a 6900 pound shoe box. It drives like it weighs about 3000 pounds less! I am not looking for fast 1/4 mile times, just a fun car to drive and showcase for my shop, it will be plenty fast for me

Here is my LS7 with my little boy riding the Maggie:



I can' wait to get it in and running. I got all these goodies and no time to do the work!

 

Wow has he grown!
Your car will be a ZO6 on steriods! Nothing to fear from ANY ZR1
on the planet!

 

http://www.gforcetransmissions.com/tran_gt-56.asp

G-Force is only company to my knowledge that makes aftermarket gear sets for our trans... RPM uses their stuff on high HP builds. Maybe give them a call to see if they started working on T6060.


Mike

 

With a centri blower imo z06/base gearing is better. Shorter gears but wider ratio. I know my z51 3-4 shift drops me to 4700-4800ish vs 5200 ish for the base/z0

 

I think the ideal trans would be the Z51 with Zr1 5th and 6th.. Mine will be done sooner or later. I never had a problem with 3-4 shift as far as the gap in ratios were. I never had a close race where when I shifted to 4th I was pulled on.. The gap from 4th to 5th is horrible, especially with the Z51 having the tallest 5th of any of the transmissions.. Then it has a shorter 6th than the base & Z06... The 5th and 6th gearing to me makes absolutely no sense on the Z51.

 

Exactly !

Im hoping to have a solution soon... (hint to solution provider, Im still waiting... )

 

If you drag race, the Z06/Z51 is the best option, Z06 being first choice.

If you never drag race, the ZR1 is the best option. The close ratio is the cats meow, with out a doubt. If you have a mile car, and you go faster than 205, the ZR1 5th is NOT the best, its too short. The Z06 5th is the best.

If you want to keep both worlds- Z06 1-4, ZR1 5th/6th.

The Z51 has too tall of a drop 3-4, as well as 4-5.

 

Good feedback, thank you.

 

We have a TR6060 gear set for the base/Z06 ratio transmission that is .80/.63

If you use a ZR1 transmission with a 4.10 differential you end up with almost identical 1st gear as a base/Z06 transmission with a 3.42 gear and you get the super close ratios.

Give us a call if you have any questions, I would be glad to go over some things with you on what we can do.

Thanks,
T.J.

 

Tj, i emailed you about this but figure i would ask on this thread too so others can see too
I have a Z51 coupe.
I know you guys charge $350 for a gear set swap.
If i wanted to buy a Built 6060 with coupe 1-4 and the Zr1 5/6 with the z51 tranny cooler provisions would it be +$350 for gear set swap and +another $350 for zr1 5/6? or is that all in the initial $350?
Im pricing out a Stage 5 tr6060 with Z51 provisions, but Coupe ratios and zr1 5/6

thanks in advance.

 

Best of both worlds IMO would be Z51 1-4th and ZR1 5-6th.