[JSH]

Has anyone here changed to a 3.73 with their A10? If yes, what has been your experience?

[KingLT1]

I don't believe you can put a 3.73 gear in your ZL1's diff. You might be able to swap in a M6 ZL1 diff which has a 3.42 gear set. Even then I would think that is still way too much gear with the A10's 4.57 1st gear...especially for your power level on street tires.

[JSH]

Originally Posted by KingLT1

Even then I would think that is still way too much gear with the A10's 4.57 1st gear...especially for your power level on street tires.

It's my understanding that the 2020 6-speed manual has 3.73 and 10-speed auto has 2.85? If I can't swap the R/P gears, I guess I would have swap rear assemblies. (damn I wish I could just swap R/P)

I know it would make 1st and 2nd gears even more difficult on the street but my idea here is to make this swap, put a true non-DOT drag slick on it and get more out the car at the strip.

[KingLT1]

Yes that is correct... R/P are welded and can not be swapped. Either way A10 cars have a hard enough time launching at the drag strip with a 4.70(not 4.57) first gear and 2.85 rear even on slicks. The SS A10 cars seem to do a little better with a 2.77 rear.

[JSH]

Originally Posted by KingLT1

Yes that is correct... R/P are welded and can not be swapped. Either way A10 cars have a hard enough time launching at the drag strip with a 4.70(not 4.57) first gear and 2.85 rear even on slicks. The SS A10 cars seem to do a little better with a 2.77 rear.

So you're saying the car won't bite with my 2.85 rear even if I put the largest drag slick that fits in the wheel well?

[wnta1ss]

You cannot tune your TCM (2020+ is locked, possibly forever), therefore it would be pretty foolish to try changing your differential IMO.

Plus, I agree with KingLT1 that you likely don't need more torque multiplication for launch. You have a lot of low-rpm torque with the PD-style supercharger, and a 4.70 low gear coupled to a 2.85 rear. What is the car running now at Bandimere, 60', etc?

[gtfoxy]

Originally Posted by wnta1ss

You cannot tune your TCM (2020+ is locked, possibly forever), therefore it would be pretty foolish to try changing your differential IMO.

Plus, I agree with KingLT1 that you likely don't need more torque multiplication for launch. You have a lot of low-rpm torque with the PD-style supercharger, and a 4.70 low gear coupled to a 2.85 rear. What is the car running now at Bandimere, 60', etc?

My thinking is along these lines as well.

The 5spd has deep rear gears because the first gear is so tall. From my familiarity with transmissions, it has to be. Manual tranny torque capacity is an inverse of 1st gear ratio. Taller gear, more torque capacity, thus deeper rear end. Even with 3.73’s it can do 60 in first gear. That’s fricken tall.

With a 4.70 first & 3.73’s you’d need one hell of a tire & suspension to get it to plant. You’d also be grabbing second at a very critical point in forward momentum.

Then with he TCM... forget about it.

[Scottyz]

I’d be worried the 1-2 shift would upset the suspension, provided it hooks, and unload it sending you possibly wall or competitor bound. Or causing mechanical breakage.

[gtfoxy]

Originally Posted by Scottyz

I’d be worried the 1-2 shift would upset the suspension, provided it hooks, and unload it sending you possibly wall or competitor bound. Or causing mechanical breakage.

I’ve had that happen. I had my 86 GT set & it launched straight as an arrow. I built my 90 Notch & the first shake down run I came off the trans brake at 7psi & I headed straight for the 60 cone. Scared the shit out of me!

[JSH]

We know about "stock" LT4 Camaros that run in the 8s. What are the chances of getting one of these guys to disclose his traction-related mods? Of course I could track one of them down at a NHRA event and have a look.

[gtfoxy]

Originally Posted by JSH

We know about "stock" LT4 Camaros that run in the 8s. What are the chances of getting one of these guys to disclose his traction-related mods? Of course I could track one of them down at a NHRA event and have a look.

Ask them what they have. A stock geared ZL1 A10 could run a 30” tires & still have a deep first gear.

[JSH]

Originally Posted by gtfoxy

Ask them what they have.

I will when I find out which sites they frequent. There are a bunch of LT4 drag cars and they many probably post on one or two of the same sites.

My car would not be a threat to them or a competitor because it's not stock. However, racers can understandably be a tightlipped bunch.

[Squatch]

Doesn't putting a fat drag radial on the car (so it wont spin at all) just make the torque management kick in even harder? (pull timing etc.), so it doesn't speed you up that much?

[KingLT1]

Originally Posted by Squatch

Doesn't putting a fat drag radial on the car (so it wont spin at all) just make the torque management kick in even harder? (pull timing etc.), so it doesn't speed you up that much?

No...if your tune is right torque management doesn't ever kick in.