This page includes Aluminum Rear Seal Caps & Attaching Hardware. The rear seal cap holds the bottom half of the rear seal to the crank and provides a surface for the oil pan to seal up against.
As a tech tip, if you are having problems with rear main seal leaks, have your machine shop surface a small amount of material (approx. .010") off the bottom of the rear seal cap using their Rod/Main cap cutter. This will hold the seal more tightly against the crank and solve many leak problems.
Our billet aluminum rear seal cap is fully CNC machined from a solid block of 6061 T-6. We make them slightly wider than the original factory units so there's no slop when it fits up into the block, which helps to avoid leaks. Don't forget the special countersunk bolts below.
We also offer an upgraded VITON fluoroelastomer rear seal. Viton is made by Dupont, and has much greater resistance to high temperatures than standard rubber. It also doesn't have a tendency to dry out and shrink over time while sitting, which makes it a great choice for cars which will sit for months or weeks in between being driven. Overall, Viton is considered a top of the line material to use for rear seal applications. One more way to combat those pesky rear seal leaks. These fit all big blocks, all years. Our 144-1000 kit includes both upper and lower seal halves.
We also offer upgraded silicone rubber rear seal end strips. These are the small strips which fit down the sides of the rear seal cap and seal it to the block. These are a huge improvement over the standard style paper or cardboard strips. Silicone is considered a much better material to use for these rear seal end strip applications. One more way to combat those pesky rear seal leaks. These fit all big blocks, all years. Our 144-1001 kit includes a package of (2) end strips. Color may be orange or blue, depending on stock.
We also carry the factory O.E. style "black" rear seals. These are a factory Chrysler part number 4227926. Sold as a pair (two halves which will equal one complete seal.) These are similar to the rear seals that come in our complete gasket sets. We now offer them separately for convenience.
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