When it comes to upgrading the rear main seal on a 1991 5.9 Cummins engine, there are several options to consider. As a diesel enthusiast, you want to make sure you're getting the best performance and reliability out of your engine. In this article, we'll explore some of the most popular choices for replacing the rear main seal on a 1991 5.9 Cummins.

First, let's talk about why upgrading the rear main seal is important. The rear main seal is responsible for sealing the crankshaft at the transmission bellhousing. Over time, this seal can wear out and begin to leak oil, which can lead to serious engine damage if left unchecked. By replacing the rear main seal with a high-quality aftermarket part, you'll be able to extend the life of your engine and prevent costly repairs down the road.

One popular option for upgrading the rear main seal on a 1991 5.9 Cummins is the ARP brand. ARP offers a range of rear main seals designed specifically for diesel engines like the Cummins. These seals are made from high-quality materials and feature advanced design features that help to reduce leaks and improve performance.

Another great option for upgrading the rear main seal on a 1991 5.9 Cummins is the API brand. API offers a range of rear main seals designed specifically for diesel engines like the Cummins. These seals are made from high-quality materials and feature advanced design features that help to reduce leaks and improve performance.

In addition to these two brands, there are several other options available when it comes to upgrading the rear main seal on a 1991 5.9 Cummins. Some of the other popular choices include the Melling brand, the Fel-Pro brand, and the Victor Reinz brand.

When choosing an aftermarket rear main seal for your 1991 5.9 Cummins, there are several factors to consider. First, you'll want to make sure that the seal is designed specifically for diesel engines like the Cummins. You'll also want to look for a seal made from high-quality materials and featuring advanced design features that help to reduce leaks and improve performance.

In addition to these factors, you may also want to consider the cost of the seal and the level of customer support offered by the manufacturer. Aftermarket rear main seals can vary significantly in price, so it's important to find a seal that fits your budget. You'll also want to make sure that the manufacturer offers good customer support in case you have any questions or issues with the installation.

In conclusion, when it comes to upgrading the rear main seal on a 1991 5.9 Cummins engine, there are several options to consider. By choosing a high-quality aftermarket part and following proper installation procedures, you'll be able to extend the life of your engine and prevent costly repairs down the road. With so many great brands and options available, it's easy to find the perfect rear main seal for your 1991 5.9 Cummins.

1991 5.9 cummins rear main seal