We are vehicle upfitters that install and sell truck and special vehicle systems and parts. Having the ability to upfit small to large truck. We work with individual to large national fleet accounts. Factory trained, ASE Gold Master Technician, and OEM Master Technicians at our facility can install any equipment to meet your needs.

We are also top leaders in alternative fuel conversions. With consultation, parts, systems and installation for CNG and LPG availible.

With many many years of hands on alternative fuels experience, Grimhall Vehicle Upfitters is your source for aftermarket conversions. Our in house conversions comply with all NFPA codes and CSA guidelines, carry a warranty and operate seamlessly. We work closely and directly with manufacturers to make sure you are getting legitimate hardware for your modern sequentially fuel injected engine. Don't be fooled by the cheap kits that can be found online. You never know what you are getting, and saving a few bucks up front could end up costing thousands more later. Our direct relationships with factories allows us to offer the best pricing on a high quality vehicle conversion that will help keep our air clean and your wallet heavy. Call or Email us for a quote.

We also carry parts. Click the big  green button to visit our alternative fuels online store. We have a large selection of CNG hardware and accessories to help installers get the job done on time and on budget.

All of our CNG cylinders are DOT certified and pass all tests for safe operation and long life - many of them carry 4 or more certifications.  Don't skimp out on this piece of the puzzle, non DOT  certified cylinders are Illegal and used expired cylinders are downright dangerous.

We'll meet or beat any stocking supplier's advertised pricing on similar cylinders. Bulk discounts are available.

In response to many requests we are now offering some legacy conversion kits as well. These conversions work nicely with older fuel injected vehicles, though they aren't recommended with newer vehicles. As with anything related to CNG, work should be done be a professional and conform to all NFPA-52 guidelines.

Website is currently under construction!!! Things will be changing around quite a bit...please bear with us while we finish the job!