Smoky Mountain Diesel Performance

12/25/2025

Merry Christmas from the family behind SMDP! We hope each and everyone of you have a wonderful Christmas Day spent with your loved ones!

We are going to be closed the rest of the week to spend quality time with ours!

God Bless you all!
-Cody & Meagan Simpson

12/13/2025

Big thanks to Grant at ETN Customz for inviting us out today! It was a great time for a great cause and we enjoyed talking to everyone.

Our shop LB7 even took home a top 5 award! Not bad for a 2003 with 350k miles!

December is also Twin to Twin Transfusion Syndrome Awareness month. My wife and I lost our sons, Banks and Baker, to it back in March of 2022. We wanted to pay tribute and to dedicate our build to them(last pic).

God Bless!

12/13/2025

We are set up at ETN Customz Toy Bash at Lyons Creek Baptist Church!

​9235 Strawberry Plains Pike
Strawberry Plains, TN 37871

Come out and see us!

11/26/2025

Upgraded transmission cooler install on this L5P to help keep that 10speed cool when towing. Let us know how we can help you with your Duramax!

10/30/2025

Wrapped up this 6.4L Ford F450 with a fresh longblock with ARP studs and a set of BD-Power Turbochargers along with several other upgrades and repairs!

Let’s get you scheduled!!📅

10/30/2025

This beautiful 2016 LML recently underwent an upgrade, featuring a Dan’s Diesel Dominator Allison Comp 1 transmission with Fleece transmission lines and flush on its existing Mishimoto transmission cooler!💨

10/30/2025

This repeat customer had inspo pictures of what he wanted and Meagan helped deliver! This 2017 6.7L Ford 450 back in for a 6.7L Maryland Intercooler Piping kit in Lollypop Blue along with some Fleece fuel filter conversions for the under hood and under bed filters and an upgraded front end with a Body Armor front bumper along with the 30inch light bar, and 4 cube flood lights!
This one was a fun one to do! We would like to do some more jobs like these!
📱Call, text, or ⌨️ message us on here and we will get you set up!

10/02/2025

💥 CLOSED FOR VACATION STARTING 10/2/25-10/10/25💥
We're taking a time-out to recharge!

Normal business hours resume on Monday 10/13/25!

God Bless!

07/31/2025

We are pleased to report a substantial increase in new customers over the summer. If you are inclined, please take a moment to share your thoughts via the Google review link below. It is an honor to serve both our new and established customers!!

We are also modifying our summer hours slightly to our new PERMANENT operating hours!

SUNDAY: CLOSED
MONDAY-THURSDAY: 8:30AM-5:30PM
FRIDAY: 8:30AM-1:30PM
SATURDAY: CLOSED

The time adjustments has seemed to be beneficial to everybody picking up and dropping off which was our goal!

Thank you all & God Bless!

4.6 ★ · Auto repair shop in Knox County, Tennessee

07/09/2025

2023 Ford in for a few performance improvements on Monday! He will be back for some more upgrades soon! 🔥

Don’t forget that we are still searching for another mechanic to join our team ASAP! Look at previous posts for all the details!

Also, we have held off for as long as we could to not increase our labor rate but unfortunately, the time has come. Starting September 1st, it will be $150 an hour and we will honor the previous rate on all already quoted jobs since January 1st of this year.

Again, thank you for supporting us and keeping us busy! Let’s have another amazing next half of the year!

06/09/2025

**NEW SUMMER HOURS**
We asked and y’all answered!
Starting today, June 9th 2025, our hours will be as follows:

MONDAY-THURSDAY: 8AM-6PM
FRIDAY: 8AM-NOON
SATURDAY & SUNDAY: CLOSED

We hope that by opening an hour earlier and staying an hour later (even though we are normally here until then anyway 😆) will help with pick up and drop offs!

Also, we are hoping to have a gate installed by the end of the summer by the entrance which will eliminate after hour drop off and pickups. Sorry for the inconvenience but we are hoping these hours will help accommodate our customers and their schedules better!

These hours could become permanent depending on how well they work out during the summer.

God Bless-
Cody and Meagan Simpson