Whoopee Doo Racing

Whoopee Doo Racing

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Performance transmission building and high performance parts. Official MFactory North American Inst

02/05/2026

This is raw aluminum post media blasting. No coating or paint of any type. Every transmission I build has this service included. A great looking transmission for you and a perfectly clean case for me to build on.

11/03/2025

This is why I haven't installed an OBX or any other knock off L*D since 2007. This is from a D17 I built a couple of years ago. The owner was having many issues with the trans so shipped it to me. This is what I found when inspecting the OBX L*D it had come with. Scroll down a few posts to see the D17 build completed. Buy once, cry once.

10/14/2025

This is my first time sharing a non-Honda build. They don't happen often, but when they do, I do them the same way.

It's a Mk VII Ford Fiesta ST 6-speed transmission. They're very different from Honda transmissions and not unlike some pickup truck transmissions being that the gears are a press fit onto the shaft instead of using splines.

This was built a couple of years ago and parts were hard to get. Some bearings have already been discontinued by Ford and had to be sourced from Europe, some parts had an insanely long backorder and some I just had to have made in the end.

It got some new OEM gears, selector sleeves and detents, all new bearings and seals, an MFactory helical L*D and Synchrotech 1-6 carbon-lined synchros.

It recently came back through after breaking the retaining tabs on the OEM reverse synchro and got an upgraded design carbon-lined replacement from Synchrotech.

07/25/2025

Custom MTM Gears 1-4 gear set, 5th cuff, and final drive in this D16Y8 transmission. Paired with an MFactory helical L*D and Synchrotech carbon master rebuild kit. Tired of breaking stock transmissions? Get in touch with me.

Photos from Whoopee Doo Racing's post 08/19/2022

Who needs a twin disc? Both D16 and D17 are in stock. Not making enough power for a twin? 2MS, 1MS, 1MD, 1OS and ACR chromoly flywheel are in stock as well for the D16.

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Johnson City, TN
37615

Opening Hours

Monday 11am - 9pm
Tuesday 11am - 9pm
Wednesday 11am - 9pm
Thursday 11am - 9pm
Friday 11am - 9pm