24-Hour Semi Truck and Trailer Repair & Maintenance

Included are Reefer Units, Fleets and Generator Repair

Medium & Heavy Duty Diesel Engine & Transmission Repair

We work on Duramax, Power Stroke and Cummins engines as well as Allison Transmissions.

Eliminating Downtime to Get You Back On the Road!

Mike’s Mobile Wrenches is dedicated to making sure your truck and trailer has minimal downtown due to breakdowns and maintenance.  We save you time and money by performing our work on-site 24 hours a day, 7 days a week.  We also have on-site daily technicians available to monitor your fleets.

We also service and maintain Thermo King & Carrier reefer units as well as Genarac, Catapillar, Onnan generators.  We have parts available 24 hours a day, 7 days a week.  We also take pride in making sure you know that we NEVER part swap; all of our parts are brand new.

We recently added a new division called MJ Diesel Speed Shop, where we repair and replace Allison Transmissions as well as Duramax OEM, Powerstroke and Cummins engines.  We also build custom diesel engines and transmissions which we will be selling on our website.

Call 678-744-5028 for more details.

Mike's Mobile Wrenches BBB rating

Caffeine and Octane

The largest monthly car show in North America is held the first Sunday morning of each month at Perimeter mall in Dunwoody, GA, just north of Atlanta.  Hours are from 8:00 am – 11:00 am.

2,500+ cars and 15,000+ fans visit each month.  The show is free to attend and free to exhibit.  

Services We Offer

24 hour on-site truck repair

Truck Repair

On-site trailer repair

Trailer Repair

On-site reefer unit repair

Reefer Unit Repair

On-site generator repair

Generator Repair

MJ Diesel Speed Shop

Mike’s mobile wrenches is excited to announce we are expanding our services!​ We now offer custom built diesel engines and transmissions!

Custom diesel engines for sale

Contact Us


Office Hours

24-hr Mobile Truck, Tractor & Trailer Repair, including nights, weekends, and most holidays.

Follow Us