Drivetrains Built to Handle the Power You Just Made

Drivetrain Specialists

Aftermarket Transmissions & Differentials, Matched to the Build

The transmission and differential are where a build lives or dies. A stroker LS or a boosted LT that shreds its stock 6-, 8- or 10-speed on the second pass isn't a fast car — it's a trailer queen. At Wisco Speed & Performance in Rosendale, WI, we spec and build complete drivetrains behind the engines we assemble: built automatics with aftermarket torque converters, upgraded manuals with performance clutch packages, strengthened gearsets, and differentials with the right ratio, the right carrier, and axles that survive real traction.

Because we build engines, install power adders, and run our own in-house dyno, we know exactly what your drivetrain has to hold — not a guess off a spec sheet, but the actual torque number your combination puts down. Whether you're drag-and-drive touring across the Midwest, cutting 1.3-second sixty-foots on radials, or turning laps at Road America, we build the transmission and differential to match how the car actually gets used.

Drag Racing

Built for Hard Launches & High Horsepower

Nothing punishes a driveline like a hard launch on a prepped surface. Shock load at the hit, full torque multiplication through the converter, and a violent 1–2 shift — stock components weren't designed for any of it. Our drag-focused drivetrain builds are spec'd around your power level, tire, and vehicle weight so the car hooks, shifts, and repeats pass after pass.

• Built automatics — upgraded clutch packs, hardened shafts, valve body and shift calibration matched to the combination.
• Aftermarket torque converters — stall speed selected for your camshaft, power adder, and launch RPM.
• Performance clutches for manual cars — holding capacity sized to actual dyno-verified torque.
• Strengthened gearsets & differentials — spools, lockers, and limited-slips with drag-appropriate ratios.
• Upgraded axles & driveshafts — so traction breaks the timing beam, not the parts.

Road & Track

Built for Durability, Cooling & Consistency

Road course and autocross work is a different kind of abuse: sustained heat, constant shifting, and a differential working corner after corner for twenty-minute sessions. A drag setup that survives ten seconds at a time will cook itself by lap five. Our road and track drivetrain builds prioritize thermal management, precise gear selection, and predictable power delivery out of every corner.

• Transmission & differential coolers — plumbed and mounted to keep fluid temps in the safe window all session long.
• Gear ratios chosen for the track — keeping the engine in its powerband through your circuit's key corners.
• Limited-slip differentials — clutch-type and helical units tuned for corner-exit traction without snap oversteer.
• Synchro & shift upgrades — clean, repeatable shifts under heat and load.
• Track-grade fluids & service intervals — spec'd for sustained high-temperature operation.