Cummins 3974981 Genuine Rocker Box Housing (2006-2018 5.9/6.7L Cummins)
Fits: 2006-2018 5.9L Cummins
Diesel Dollars is Southern Diesel Supply's Loyalty Program. Purchasing with Us Earns you 1 Point for every 1 Dollar spent to use for future buys!
By ordering the Cummins 3974981 Genuine Rocker Box Housing (2006-2018 5.9/6.7L Cummins) you will earn 350 DIESEL DOLLARS in your SDS Fuel Tank!
This is a Genuine Cummins rocker lever housing, part number 3974981, listed here as a rocker box housing for 2006-2018 5.9L and 6.7L Cummins trucks. It is the housing that surrounds the rocker levers at the top of the engine. You buy it to put the factory Cummins piece back in place of a damaged housing, but confirm your engine first, because Cummins lists this number primarily for one engine build.
Fitment
Our title and engine tag list this housing for 2006-2018 5.9L and 6.7L Cummins engines. In Dodge and Ram 2500/3500 trucks, that span covers the 5.9L through 2007 and the 6.7L from 2007.5 on.
Cummins' own parts listing describes 3974981 as used primarily on EPA13 6.7 liter ISB/QSB engines. That is narrower than our title, so treat this as a part to confirm before you buy. Verify fitment by VIN and by your engine serial number, or call us and we will check it for you. Cummins puts the engine serial number on the engine data plate, usually on the rocker cover or on the side of the gear housing.
Why this part
The rocker lever housing is part of the top end of the engine. When one is cracked or damaged, the clean fix is a new housing with the correct part number. Because Cummins lists this number primarily for EPA13 6.7 liter ISB/QSB engines, displacement and model year alone may not pick the right one. The number on your old housing and your engine serial number are what count.
This is a Genuine Cummins part, the factory piece rather than an aftermarket copy. If you are rebuilding or resealing the top of the engine, starting with the factory housing takes one variable out of the job.
What you get
- One Genuine Cummins rocker lever housing, part number 3974981
- No gasket is listed with it, so check what your job needs before you start
About Cummins
Cummins has built diesel engines for more than a century, from its founding in Columbus, Indiana, in 1919 to the same hometown today. In the pickup world, the name stands for the inline-six in heavy-duty Dodge and Ram trucks, the 5.9L through 2007 and the 6.7L since 2007.5. Everything in our Genuine Cummins parts line, this housing included, is the factory part.
Frequently asked questions
Why does Cummins say EPA13 6.7L when the title says 2006-2018?
Cummins describes where a part is primarily used, and for 3974981 that is EPA13 6.7 liter ISB/QSB engines. Our title covers a wider 2006-2018 5.9L and 6.7L range. Do not assume it fits until your engine serial number confirms it. Verify fitment by VIN or call us and we will check.
Where do I find my engine serial number?
On the engine data plate. Cummins says the plate is usually on the rocker cover or on the side of the gear housing.
Is this an aftermarket housing?
No. It is a Genuine Cummins part, sold under Cummins part number 3974981.
Questions on fitment? Call the shop at the number in the header. We install everything we sell.
Diesel Dollars is Southern Diesel Supply's Loyalty Program. Purchasing with Us Earns you 1 Point for every 1 Dollar spent to use for future buys!
By ordering the Cummins 3974981 Genuine Rocker Box Housing (2006-2018 5.9/6.7L Cummins) you will earn 350 DIESEL DOLLARS in your SDS Fuel Tank!