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!

Out with the old, in with the new! Installing a Bulletproof Diesel billet water pump on this 12 ram 3500
07/16/2026

Out with the old, in with the new! Installing a Bulletproof Diesel billet water pump on this 12 ram 3500

!-Chinese aftermarket air filters strike again-! This 19 Chevrolet 3500 was towed over a hour to us because as soon as y...
07/07/2026

!-Chinese aftermarket air filters strike again-!
This 19 Chevrolet 3500 was towed over a hour to us because as soon as you put it in drive and go to move, it would shut down. Pressures looked good, but it was only moving 7g/s through the MAF at idle. The cheap air filters barely flow enough when they are new, and as soon as they get a little dirty, they collapse and begin to suck up into the intake.
More and more we see situations like this. We understand the need to save money whenever possible, but proper parts and maintenance is not the area to cut costs on. We only use OEM or better parts for any repair we do, and with quality parts, we never see issues like this.
If you need to make sure your vehicle is properly maintained, give us a call
470-592-2268

Extremely busy on our transmission side here lately. From repairs to new builds, these 68s are keeping us busy! #20...
07/01/2026

Extremely busy on our transmission side here lately. From repairs to new builds, these 68s are keeping us busy!

#2026

Another 68 down. It seems to be a trend at the moment!
06/30/2026

Another 68 down. It seems to be a trend at the moment!

This 4th of July, we proudly celebrate 250 years of American independence and the enduring values of freedom, hard work,...
06/29/2026

This 4th of July, we proudly celebrate 250 years of American independence and the enduring values of freedom, hard work, and opportunity.

From our SDP family to yours, we wish you a safe, joyful, and patriotic Independence Day.

God Bless America! 🇺🇸

PSA for 03-12 Ram trucks. !CHECK AND GREASE YOUR FRONT DRIVESHAFT!This is a little known greasable area that a lot of ow...
06/27/2026

PSA for 03-12 Ram trucks.
!CHECK AND GREASE YOUR FRONT DRIVESHAFT!
This is a little known greasable area that a lot of owners and shops dont know about. Some of the early ones do not even have a grease port, but they all require attention during normal services.
If you have any play or noise from your front driveshaft... fix it immediately! These front driveshafts spin all the time, and when the double cardan joint fails at highway speeds, the damage is catastrophic.
We have this vehicle in the shop right now for this and it has destroyed the front shaft, wiring harness, brake, trans & fuel lines, transfer case, transmission , and caught fire from the transmission fluid.

If you're unsure what you have or would just like to know your vehicles overall condition, give us a call and schedule one of our multi point inspections so we can make sure your vehicle will stay on the road for many miles ahead!

Simmons Diesel Performance

470-592-2268

107 Yatesville Rd. Barnesville, Ga 30204

Simmons Diesel Performance will be closed Monday, June 15 through Friday, June 19.Our team will resume normal operations...
06/15/2026

Simmons Diesel Performance will be closed Monday, June 15 through Friday, June 19.

Our team will resume normal operations and reopen on Monday, June 22.

This closure allows our employees an opportunity to enjoy a well-deserved break and spend quality time with their families.

Thank you for your understanding, patience, and continued support.

We appreciate your business and look forward to serving you when we return.

Simmons Diesel Performance
📞 470-592-2268

📢 Important Notice to Our Valued Customers 📢Due to significant increases in oil costs across the nation, wholesale oil p...
06/10/2026

📢 Important Notice to Our Valued Customers 📢

Due to significant increases in oil costs across the nation, wholesale oil prices have risen by as much as 60% in some areas. This applies to all of the lubricating fluids in your vehicle. Unfortunately, these increases affect the cost of maintenance and services throughout the automotive and diesel repair industry.

We want our customers to know that Simmons Diesel Performance has no control over the rising cost of oil and related products.

While we continue to work hard to keep our pricing as fair and competitive as possible, some service prices may be impacted by these industry-wide increases.
We appreciate your understanding and continued support.

If you have any questions about upcoming maintenance or service pricing, please feel free to give us a call.

📞 470-592-2268

📍 107 Yatesville Rd., Barnesville, GA 30204

Thank you for choosing Simmons Diesel Performance!

Prepping some more 68rfe parts. Another thing we do to all of our units is polish all bushing surfaces. Some call it ove...
06/08/2026

Prepping some more 68rfe parts. Another thing we do to all of our units is polish all bushing surfaces. Some call it overkill, we call it perfection. We do everything possible to make sure your vehicle will stay on the road for as long as possible after our repairs.

Wrapping up a leaking 6.7 Powerstroke upper oil pan.
05/29/2026

Wrapping up a leaking 6.7 Powerstroke upper oil pan.

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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