Cummins
Shop All
SKU #: CMNS-3947574
MPN #: 3947574
Cummins 3947574 Belt Tensioner Assembly 03-18 Dodge 5.9L / 6.7L Cummins
Description
As your Cummins develops some miles, the belt tensioner's spring can lose its ability to maintain tension, causing uneven wear of your belt, or the belt to completely fail altogether. If its time to replace your tensioner, check out this genuine Cummins direct replacement.
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
About Cummins
While we are obvious supporters of the aftermarket, there are times when it does make the most sense to stick with factory Cummins components for various upgrades or repairs. While we do not carry every component, we do stock items that we feel are a good choice when making the decision to go stock or aftermarket.
If you don't see what you're after, feel free to give us a call or send an e-mail to cs@dieselpowerproducts.com and we would be happy to assist.
If you don't see what you're after, feel free to give us a call or send an e-mail to cs@dieselpowerproducts.com and we would be happy to assist.
Blog
June 05, 2026
Your exhaust system moves spent gases out of the engine and away from the cab. The muffler...
Read MoreResonator vs Muffler: Key Differences Explained
June 03, 2026
The 1st gen Cummins ran from 1989 to 1993. Dodge put the 5.9L 12-valve inline-six into the...
Read More1st Gen Cummins Pros and Cons
June 02, 2026
Your 5.9 Cummins will tell you the lift pump is starting to go before it stops working...
Read More5.9L Cummins Lift Pump Failure Symptoms Guide
May 07, 2026
If you own a 2003–2007 Ford Super Duty with the 6.0 Powerstroke, the oil cooler is one...
Read MoreBest Oil Cooler for 6.0 Powerstroke (Top Picks Guide)