Alpharetta, GA · Since 1986
if you've got the horsepower
we've got the transmission.
Performance GM transmissions from 500 to 1,200 horsepower. Torn down to the case. Every wear part replaced. Every weak point engineered out. 1-year unlimited-mile warranty, standard.
Free shipping to most states · No core charge on most units · Pre-programmed to your VIN
SINCE 1986
35+ years, second-generation builder
1-Year
Unlimited-mile warranty, standard
Free Shipping
To most states, no core charge on most units
VIN-Programmed
Direct bolt-in. No modifications.
From
From
From
From
60 SECONDS, NO GUESSWORK
FIND YOUR BUILD
Pick your transmission family and target horsepower. We’ll point you at the right unit — and we’ll tell you straight if you need to step up a platform.
The hardware, not the hype
What's inside every Mad Dog unit
This is the difference between a transmission that’s rated for power and one that holds it. Real parts, listed plainly.
Raybestos High-Temp Clutches & Z-Pak
Raybestos high-temp, high-energy clutches throughout. The Z-Pak puts 15 clutches in the 3-4 drum where the factory ran five.
The Beast Sun Shell
Oversized, hardened sun shell at 3x factory thickness. The single most common 4L60E failure point — engineered out.
Pump & Pressure
13-vane (Punisher) or 10-vane pump rotor with 4140 hardened rings and a Teflon pump bushing, plus a 500 boost valve for line pressure that holds under load.
Sprags & Planetaries
29-element double-gauged sprag — 34-element in the 4L80E — and cold-treated 4-pinion planetaries that shrug off shock loads.
Bands, Servos & Accumulators
3″ Pro-Series Kevlar band, Corvette servo (billet servo on Dominator with +30% holding power), and Sonnax aluminum accumulators replacing the factory plastic.
All-New Everything Else
New solenoids, EPC, TCC, harness, and pressure manifold with the 1870-code fix valve. Complete master overhaul kit: all new lip seals, gaskets, Teflon rings, filter, steels, bushings, and sprags.
Word travels
Builders trust the dog
"
Dropped the Godfather 4L60E behind a 600 HP LS and it shifts like it was born there. Pre-programmed to my VIN — bolted in and drove the same weekend.
— LS-swap customer, Cumming GA
"
Lou told me straight: don’t buy the bigger unit if you don’t need it. Sold me the right transmission instead of the expensive one. That’s why people drive past three shops to get here.
— C10 owner, North Atlanta
"
Two seasons of track days on the Destroyer 4L80E. Zero issues. The warranty was the reason I ordered; the build quality is the reason I’m back for my second car.
— Drag-and-drive customer
In the Atlanta area?
Transmission repair, done right the first time
Diagnostics, repair, rebuilds, and torque converter service for Alpharetta, Cumming, Forsyth County, and North Atlanta. Every repair starts with proper diagnostics — a solution, not a guess.
Ready to put real power down?
Tell us what you’re building. We’ll build the transmission that holds it.
1-year unlimited-mile warranty · Free shipping to most states · Custom builds to 1,500 HP