Rear Gears - ZR-1 Net Registry Forums

Aurora40 · 09-23-2007

I've thought 3.73:1's would be a nice gear also. And the speedo correction gear is like a $10 GM part vs a $140 custom part.

The only thing is 3.73:1 isn't a huge change. It costs the same for the gears as 4.10:1, and costs as much to install. But for less "improvement".

A 3.90:1 might be a good in-between. A fair amount of change, but not quite so gear-shortening as the 4.10's. I thought 3.90:1 gears were hard to find? Or maybe it was the speedo correction gears?

If you math it out on the LT5 vs the L98, with a 3.33:1 rear and a 5,500 rpm redline, to have the same shift points in MPH at 7,100 rpm, the LT5 should have a 4.30:1 rear end. In reality the L98 shifts earlier, giving it even shorter gear ranges than that.

Not sure what that is worth, though.

As an aside, guess you decided to go with the 500hp package?

09-23-2007	#3
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: Rear Gears I've thought 3.73:1's would be a nice gear also. And the speedo correction gear is like a $10 GM part vs a $140 custom part. The only thing is 3.73:1 isn't a huge change. It costs the same for the gears as 4.10:1, and costs as much to install. But for less "improvement". A 3.90:1 might be a good in-between. A fair amount of change, but not quite so gear-shortening as the 4.10's. I thought 3.90:1 gears were hard to find? Or maybe it was the speedo correction gears? If you math it out on the LT5 vs the L98, with a 3.33:1 rear and a 5,500 rpm redline, to have the same shift points in MPH at 7,100 rpm, the LT5 should have a 4.30:1 rear end. In reality the L98 shifts earlier, giving it even shorter gear ranges than that. Not sure what that is worth, though. As an aside, guess you decided to go with the 500hp package?