Welcome to Garmons Diesel Performance....
Call Us Today....404- 557-4972
Garmon's Diesel Performance strives to deliver the highest quality diesel transmission, engines and products available anywhere! 
Jeff Garmon..... The Mastermind Behind It All!!!
Garmon's Diesel Performance is a full service diesel performance shop located in Griffin, GA just south of Atlanta. Garmon's Diesel Performance offers just about anything you could need for your diesel from simple repair work all the way up to race-ready engines and transmissions. Whether you want to refresh your tired old diesel truck, properly equip your stock truck for efficient and reliable towing or make your truck a force to be reckoned with on the drag strip, Garmon's Diesel Performance has what you need. Jeff Garmon has been wrenching on diesels longer than most folks in the industry. He began his career in 1987 and has been a pioneer in the diesel performance industry. He has been competing since diesel pickups started having organized competition, winning and setting records all the while. In 2008 Jeff won the TS Performance Outlaw Challenge and the NADM Unlimited Street championship. In 2011 Jeff organized and held the highest paying diesel drag race in history. Since Jeff's focus is on supplying reliable engines and transmissions for street driven vehicles, Jeff focused this race on street driven trucks. The payout was an unprecedented $25,000 and was won with a daily driven truck. Jeff's know-how and tuning can be found in several of the fastest and quickest trucks in the nation. Jeff has been featured in numerous articles in Diesel World Magazine, Diesel Power Magazine and 8 Lug Magazine. 
Jeff prides himself on his research and development of new products and procedures that improve the efficiency and reliability of your truck. Garmon's Diesel Performance offers a full line of transmissions, torque converters and valve bodies as well as full engine rebuilds or just simple upgrades. Garmon's Diesel Performance is proud to offer products from Smarty, PPE, EFI Live, Sun Coast and Silverline Exhaust. As well as Garmon developed torque converters, transmissions and valve bodies, just to mention a few.
Garmon's Diesel Performance is an impressive 10,000 square foot facility consisting of 2 buildings. Each building is specific to it's use. One side houses a 5,000 square foot engine shop and the other houses a 5,000 square foot transmission shop. Our facility is equipped to perform like no other. We can test your injectors on our state of the art injector testing machine, machine pistons, build heads, fabricate exhaust and turbo piping and my favorite, DYNO TEST TRANSMISSIONS!!! Every unit we install or ship is fully dyno tested. Coming soon we will be adding a chassis dyno. From transmissions to engines, machining to fabricating and testing to tuning WE HAVE IT ALL!!!!
Rick Gilbert Our Master Transmission Builder....