Maintenance · Transmission Service
Catch Transmission Trouble While It's Still a Fluid Change, Not a Rebuild
Slipping shifts, hard engagement, burnt fluid, whining gears — every transmission failure starts small. We service, repair, and replace transmissions and differentials in-house at 177 N Grant St in Rosendale, on everything from daily-driven trucks to classics, modern performance cars, and exotics.
Why It Matters
A Transmission Rarely Fails Without Warning — If Someone's Paying Attention
Heat is what kills transmissions, and worn-out fluid is what lets heat win. By the time most drivers feel a slip or hear a whine, the wear has been building for thousands of miles. The good news: caught early, most transmission problems are a service, not a rebuild. Below is how we handle every stage — from routine fluid changes to full transmission and differential replacement — all under one roof.
Transmission Fluid Service
Fluid Changes & Flushes for Automatics, Manuals & Built Transmissions
Transmission fluid doesn't just lubricate — it cools, cleans, and carries the pressure that makes your shifts happen. Once it burns, every mile costs you clutch material. We flush and replace fluid on automatics and manuals alike, with fluid matched to your transmission and your power level, not whatever's on the shelf.
- Automatic transmission flushes to prevent wear and overheating
- Manual gearbox fluid service handled in-house
- Fluid matched to the transmission — stock spec or performance-rated for hard use
- While we're under there, we check for leaks, worn mounts, and driveline play
Repair & Replacement
When Service Isn't Enough, Replacement Happens in This Building Too
Slipping between gears, delayed engagement, harsh downshifts, fluid that smells burnt — we'll tell you straight whether you're looking at a service, a repair, or a replacement, and what each one actually costs. No scare tactics, no upsell script. If it needs to come out, the same hands that assemble our high-horsepower drivetrains do the work.
- Honest diagnosis first — we road-test and check the fluid before quoting anything
- Transmission replacement for automatics and manuals, done in-house
- Clutch, converter, and driveline work alongside the transmission itself
- Upgrading? We can spec a transmission for the power you're planning, not just the power you have
Differentials
Differential Service & Replacement — Stock Axles to Performance Rear Ends
Your differential takes everything the transmission sends it, and gear oil breaks down fastest under towing, hard launches, and big power. We drain, inspect, and refill with the right gear oil — and when a rear end is worn out or under-built for the job, we replace it, the same work we do behind our own performance builds.
- Gear oil changes with wear-metal and gear-condition checks every time
- Limited-slip additives where the diff calls for them
- Differential repair and replacement handled in-house
- Performance rear ends specced for launches, towing, and track use
What We Work On
Daily Drivers, Classics, Modern Performance & Exotics
A shop that builds 1,000+ HP drivetrains knows exactly what a transmission is supposed to feel like — and exactly what it feels like right before it lets go. That experience covers your work truck's automatic the same as it covers a classic's original gearbox or a modern performance car's high-strung drivetrain.
- Daily drivers and work trucks — keep the miles coming without surprises
- Classics — serviced with respect for original drivetrains
- Modern performance vehicles — GM, Mopar, and Ford Performance are our home turf
- Exotics — the careful hands and clean bays they demand
Service Area
Proudly Serving Rosendale & the Surrounding Fond du Lac Area
Wisco Speed & Performance handles transmission and differential work for drivers across east-central Wisconsin. Our shop at 177 N Grant St in Rosendale is a short drive from all of these communities:
- Rosendale, WI
- Fond du Lac, WI
- Ripon, WI
- Brandon, WI
- Van Dyne, WI
- Green Lake, WI
- Oshkosh, WI
- Berlin, WI
- Omro, WI
Feeling a slip, a shudder, or a delay when it shifts? Call (920) 579-0605 and describe it — we'll tell you whether it can wait for an appointment or needs to come in now. No scare tactics.
Request Service
Get Your Transmission Looked At
Fluid service, a slipping shift you want diagnosed, or a full transmission or differential replacement — send the details and we'll call you back with a straight answer on cost and timing.
Call the Shop
(920) 579-0605Visit
177 N Grant St
Rosendale, WI 54974
What Happens Next
We'll call you within one business day to talk through the symptoms, confirm what your vehicle needs, and get you on the schedule. No pressure, no upsell script.
Why It Matters Here
The same hands that build 1,000+ HP drivetrains service your transmission — and a shop that builds them knows exactly what worn fluid and neglected gears cost.