Engine Mounts


Bell housings, flywheels, flywheel housings

Vacuum/Steering Pumps

Exciter Ring Kit

Lower Hose Kit

A/C Compressor Mount

Belt Tensioner

TJ/JK Fuel Tank Conversion

Intake Kit

Clutch Fan

Stainless Down Pipes

TJ Exhaust Kit

Lift Kits
     CJ (1976-1986)
       YJ (1987-1995)
       TJ (1997-2006)

Gearing & Axles

Optional Accessories



Customer Projects



shawn@jeffdanielsjeeps.com                           215-256-8090 x 14



• Jeff Daniel’s Jeep Customizing has designed and manufactures the components necessary to swap a 4BT Cummins Diesel engine into your CJ, YJ, TJ, or JK Jeep (1976-2012). We can also install them in full size cherokees, pick ups, Land Cruisers, etc. The mounts are designed to fit any frame that measures 23.5" - 32.5" on the inside of the rails.

• In order to properly convert your Jeep we will need to know a few things about your 4BT and about your Jeep. Please be sure and fill out the questionnaire and follow the instructions on the last page.

• The swap will yield you better fuel economy, better torque for off-road and towing, longer life of the Jeep, and lots of looks on the street!

• We use 4BT Cummins engines for our swaps., and recommend the AX-15 transmission or an NV4500 also works well. In newer Jeeps 2005 + the stock NSG370 works but may require modification. You can also use a TH400, 700R4, 4L60, or Ford AOD if you prefer an automatic. (may require modification) 3.07 gears with 33” tires will get you the best fuel economy.

• Your jeep will also need approximately 4” of lift in order to fit the 4BT inside the engine compartment.

• This swap will take about 80-100 hours to complete.

• Basic mechanical ability as well as basic shop tools are required.

• Engine and Transmission are not included in our kits, if you cannot locate your own contact Jeff Daniel’s and we will be glad to help.

• The parts listed on the following pages are sold a-la- cart since there are a lot of variations.

• If you have a TJ (97-06) and wish to use your A/C, you need a Ford style 4BT with a high mount middle turbo works best otherwise modifications will be needed to the a/c system;  a CJ (76-86) series Jeep requires a Ford as well to accommodate the drive shaft. YJ's(87-95) can be either and JK's(07-14) need a chevy style if you plan to use the stock 6 speed (NSG370)

• Certain components are only needed on certain model Jeeps.

• Check with your State's Department of Transportation on how to re-register your vehicle as a diesel. This is required by states with inspection/emission laws. One way to do this is to apply for a reconstructed title