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it depends on the size of your wheels/tires though for your rpm at each speed.. that'll change things. with 4.10s i went from 15mph city to 19mpg city, down from 25 hwy to 22hwy.
I will check into it and verify once I get back out on the highway. I honestly don't think it was that high. I have 285/40/18's on the rear. The tach might be off a little too. I know that is an issue with these cars.
My car is a 5-speed and came factory with 3.31s so it was a huge difference. I think that in the 07-up cars, 3.31s were factory even with the 5-speed. I may be wrong though?
Ok, did a little more research. The later model TR-3650's had a .62 5th gear versus the .68 in the earlier GT's. According to the numers, I have a tire that is 26.9" tall, 4.10 axle ratio, and a .62 5th gear. Add this all together and you get 69.25 mph at 2200 rpm. Like I said originally.
Congrad's on the new gear bro! That's whats up next for me this summer. Since you didn't put up a pic for us pic-ho's, I thought I would come in with an assist
I believe GT manuals come with 3.55 (?) or as an option 3.73. I know my auto came with 3.31 and switching to 4.10s was a really nice change. The car definatly has a more torquey feel to it, its a great mod. Even more fun with a m90 in there.
I believe it was 3.31's and 3.55's as an option. Check the sticker on your differential cover.