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Thanks guys! @clarkspeed Daytona sounds like a real trick with the speed differential. Can you opt for a main shaft that you can just barely get rolling off the line, but allows the top speed? I keep thinking about a Winters style quick change, so I don't have to rebuild a couple of rear ends around my diff. I think my ratios are good for my power, and I just need to modify top speed with final drive. Looking at west coast tracks, I think a top speed in the 150's is ideal. much faster you need tons more power, and a 5 or 6 speed to keep the ratios reasonable. I took your note and the Maximum Motorsport design to heart, so when I needed to build my own, I opted for .250" plate. It ended up being a problem, since I had to bend it with a torch and vice! Really needed a hydraulic press to go with the torch haha. Tire size was a big driver of this full conversion. All the new tires coming out share the 315/30r18 common size, and most race series include some form of a 12x25.5r18. The benefit of top speed gearing is an added bonus! A quick link to the gear calculator I've been using: https://www.blocklayer.com/rpm-gear.aspx You can tie this together with a dyno plot of the car, and make sure that you maintain good powerband. It also lets you play with all the variables, so you can plan changes!

[Holly Shiiittte. I have dreamed of this many times and realize your difficulties. On gear ratio, I am facing a similar problem. I have a Jerico 4 speed in the car I am building which is always 1:1 in 4th for those in the know. I am looking at multiple tire diameters but limited to 16 or smaller on rim. Smaller the better for weight. But Daytona is one of the tracks I must build for, and that is max speed whatever your car will do. So unless I can move to a 3.3 or lower gear or I will need to increase tire diameter. So I am thinking about a 26-27 tall 15" tire (think Nascar) or swapping a Ford IRS rear. Of course money is always an influencer. I have 3.5 and 3.9 R200's loaded with Quafe's ready to roll. So gear ratio becomes an issue for just 1 track. I am trying to find a way to run from 50 mph to 160 mph with the same tranny. That is really an accomplishment running 18" in competition. Looks like you adapted to the dog box very well in the video. I can accommodate most any tire size with my current suspension like you I may have some physical interference I need to watch for. I am most impressed with you recent changes. As I mentioned in a previous post, I am lucky to know some REALLY fast Z cars intamately. And your build is definitely pushing the envelope.