Simmons Diesel Performance, LLC

Simmons Diesel Performance, LLC Specializing in light duty diesel pickups, all repairs minor to major. We also carry our own line of upgraded transmissions.

We offer complete diagnostics, fuel system repairs & upgrades, engine repairs, electrical, HVAC, driveline, steering, and suspension service, and upgraded transmissions. Located in Barnesville, Georgia we at Simmons Diesel Performance, LLC specialize in all Ford, Dodge/Ram, and Chevrolet diesel trucks up to a 5500 series. all built in house for any of your needs. We take pride in our customer serv

ice as well as the quality and precision of our work. We are very meticulous, we work on just a couple of vehicles at a time so that the job is never rushed, this way we are able to guarantee every job is done accurately and even the tiniest bit of detail is paid attention too and never overlooked. We design and build all specialty components in house and do the work ourselves from start to finish. All items that we construct are designed with Solid Works CAD program to assure the most precise fitment and assembly. The machining, engine &, transmission builds, fabrication and certified welding is also completed in our shop to guarantee our work is done in the most accurate way. Due to the detail and time we spend on our jobs we are not always able to answer the phone. Please call 470-592-2268 If no answer leave us a detailed message with your name, contact number, reason for your call, and all of your vehicle information such as: make, model, year. You can also email us [email protected]. We thank you for your patience and will be in touch with you as soon as possible!

Let's swap out this A/C line "real quick"
09/04/2026

Let's swap out this A/C line "real quick"

Flashback Friday. Doing some drums on a 12 valve.
09/04/2026

Flashback Friday. Doing some drums on a 12 valve.

09/02/2026
GM, Ford, Dodge. We repair them all.
09/02/2026

GM, Ford, Dodge. We repair them all.

Nothing like some electrical repair issues on a Friday. In and out like clockwork.
08/28/2026

Nothing like some electrical repair issues on a Friday. In and out like clockwork.

Finally Friday and finishing up this 2023 Ram! Several repairs and a Banks Grid delete, this truck leaves out much bette...
08/28/2026

Finally Friday and finishing up this 2023 Ram! Several repairs and a Banks Grid delete, this truck leaves out much better than it came in!

Daily routine. Diagnose, repair, complete and then repeat.
08/26/2026

Daily routine. Diagnose, repair, complete and then repeat.

Take your wins when you get them on a duramax. If you know, you know. If you dont, then you're lucky!
08/25/2026

Take your wins when you get them on a duramax. If you know, you know. If you dont, then you're lucky!

This 2018 Ram 6.7 Cummins came in with the notorious timing housing oil leak. We're getting it torn down and ready for a...
08/20/2026

This 2018 Ram 6.7 Cummins came in with the notorious timing housing oil leak. We're getting it torn down and ready for a reseal.

This 6.7 Cummins for Gamez Hauling LLC is getting the full works before hitting the road hauling. This ram 3500 already ...
08/15/2026

This 6.7 Cummins for Gamez Hauling LLC is getting the full works before hitting the road hauling. This ram 3500 already has one of our 600 series 68rfe transmissions, now its getting grid heater delete, cheetah turbo, and sure flow sending unit, along with a exhaust manifold, 165, 625 head studs, Hamilton valve springs and hd pushrods, fully rebuilt and O-ring cylinder head with Cummins Inc head gasket, EGT kit, Bullet Proof Diesel billet water pump, steering gear, B&W Trailer Hitches turnover ball Gooseneck hitch, new OEM hub assemblies and ball joints.

It'll be ready to be worked hard for many miles once it leaves here, if you're needing repairs or upgrades, give us a call! 470-592-2268

Address

107 Yatesville Road
Barnesville, GA
30204

Opening Hours

Monday 8am - 11:59am
1pm - 5pm
Tuesday 8am - 11:59am
1pm - 5pm
Wednesday 8am - 11:59am
1pm - 5pm
Thursday 8am - 11:59am
1pm - 5pm
Friday 8am - 11:59am
1pm - 5pm

Telephone

+14705922268

Website

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