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Garmon's Diesel Performance, Inc.
Recommendations & Reviews
About us
About Garmon's Diesel Performance
Garmon's Diesel Performance is a full service diesel performance shop located in Griffin, GA just south of Atlanta. Offering 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.
Garmon's Diesel Performance offers a full line of transmissions 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.
The Man
Owner 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 along with 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.
The Shop
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... show more 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. From transmissions to engines, machining to fabricating and testing to tuning WE HAVE IT ALL!!!! show more
Garmon's Diesel Performance is a full service diesel performance shop located in Griffin, GA just south of Atlanta. Offering 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.
Garmon's Diesel Performance offers a full line of transmissions 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.
The Man
Owner 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 along with 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.
The Shop
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... show more 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. From transmissions to engines, machining to fabricating and testing to tuning WE HAVE IT ALL!!!! show more
Hours of operation
Monday8:00AM - 5:00PMTuesday8:00AM - 5:00PMWednesday8:00AM - 5:00PMThursday8:00AM - 5:00PMFriday8:00AM - 5:00PM
OPEN NOW
6 recommendations and reviews from 2 people
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Referral from
April 5, 2017
Deana W. asked:I AM LOOKING FOR A CERTIFIED DIESEL MECHANIC WITH EXPERIENCE TO MAINTAIN A FLEET OF TRUCKS AND TRAILERS. I AM ALSO LOOKING FOR AN EXPERIENCED TIRE MAN TO CHANGE TIRES ON BIG RIGS, TRACTORS, FORKLIFTS, LOCK RINGS / SPLIT RINGS, ETC. SERIOUS INQUIRIES ONLY. CALL ANYTIME 7:00AM TO 9:00PM MONDAY THRU SUNDAY. CELL # 706-975-9664 OFFICE # 706-647-0489Kacie E. replied:Garmons Diesel Performance Jeff Garmon 404-557-4972
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Referral from
February 21, 2018
Austin E. asked:Delete if not allowed. Looking for recommendations on some shops that will install 650hp clutch. Valair or southbend doesn’t matter. 2 places I called never got back with me, customer service means more than anything. I’m located 30 miles west of Atlanta. Thanks!Amy G. replied:We would be glad to help. https://www.facebook.com/154534921252387 Garmon's Diesel Performance, Inc.. 404-557-4972
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Referral from
February 5, 2018
Brad D. asked:Looking for recommendation for diesel mechanic to do 150k mile valve adjustment on a Cummins 5.9 in the Peachtree City- Newnan area. Anyone who has had this done can you give me an idea of cost also. ThanksAmy G. replied:We would be happy to help. You can reach Jeff at 404-557-4972 https://www.facebook.com/154534921252387 Garmon's Diesel Performance, Inc.
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Referral from
October 21, 2017
Stephen C. asked:Looking For Cummins Mechanic $10,000,000 - Evans, GA Looking for someone who works on Cummins 5.9l engines. Please comment or message me if you know someone. Thanks,Amy G. replied:We would be happy to help. You can reach Jeff at 404-557-4972. https://www.facebook.com/154534921252387 Garmon's Diesel Performance, Inc.
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Referral from
September 18, 2017
Tina G. asked:, any good mechanics in the area that work on diesel trucksAmy G. replied:Garmons Diesel Performance 404-557-4972
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Referral from
February 6, 2015
Amy G. asked:Looking for recommendations for an electrician for a commercial building.... GO...Amy G. replied:My husband is looking for somebody tondo work at our shop. If you are interested in giving him a quote please call him at 404-557-4972 Jeff Garmon. Thanks
Recommendations from Amy G.
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