Here is a list of the T-10 gear ratios below. Now as you can see there are a few things that immediately stick out. First the T10 is only a 4 speed. Second the T10 has no over drive gear ratio. Over drive gear ratios are very important for cruising fuel economy as they allow you to drop engine rpm and obtain more mpg. While they were very stout and designed for power and racing the gearing would not work near as well as a T5 transmission for my application. Not to mention the T10 is more of a specialty transmission and like you pointed out is more expensive. The T5 will handle more than enough torque and horsepower for my proposed design. The T5 were used in Mustangs among others which from a horsepower and torque perspective make Tigon seem laughable even with the hybrid torque and horsepower boost. T5 transmissions can handle 300 ft-lbs and be built up to with stand more if desired. They have 5 gears with lower initial gearing and overdrive up to .63. This is a huge advantage to an ecomodder not offered in a T10 which as you can see only have a 1.00 4th gear as its tallest option. Also the lower initial gearing allows you to accelerate much quicker than in a higher gear selection. The T10 has a 2.88 first gear option while the T5 has a 4.03. So with a T5 you can configure it for excellent quick starting acceleration around town yet get incredible cruising MPG ability while on the freeway with the tall .63 overdrive. Also the T5 is used in tons literally tons of vehicle makes and models so this means its cheap and extremely easy to find. Every local wrecking yard will have them and new parts are extremely easy and cost effective to source for rebuilds. T5 transmissions are also very customizable and extremely easy for the DIY guy to rebuild. Many books and videos are available to help guide a first time rebuilder in the T5 rebuild process.
Warner T-10 2.54 1.92 1.51 1.00
Warner T-10 2.10 1.64 1.31 1.00
Warner T-10 2.54 1.89 1.51 1.00
Warner T-10 2.36 1.78 1.41 1.00
Warner T-10 2.36 1.76 1.41 1.00
Warner T-10 2.73 2.04 1.50 1.00
Warner T-10 2.36 1.62 1.20 1.00
B-W Super T-10 2.64 1.61 1.23 1.00
B-W Super T-10 2.64 1.75 1.33 1.00
B-W Super T-10 2.88 1.74 1.33 1.00
B-W Super T-10 3.44 2.28 1.46 1.00
B-W Super T-10 2.23 1.77 1.35 1.00
B-W Super T-10 2.43 1.61 1.23 1.00
B-W Super T-10 2.43 1.76 1.47 1.00
B-W Super T-10 2.64 2.10 1.60 1.00
B-W Super T-10 2.64 2.10 1.46 1.00
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