LS Timing & Rear Main Cover Alignment Tools & Seal Installer GM Gen III & IV LS1-LSA-2-3-6-7-9-LQ4-LQ9-4.8L-5.3L-6.0L-6.2L & more. We are the Original inventor of these Tools! Don't buy knock-offs!

This tool is legit. Made the installation of an LS rear main seal a snap. Could not believe how easy the seal lined up went in. PERFECT! A must have.

When first received the set of 3 tools, the rear centering tool was missing both O-rings. 30 days later on 12-31-2020 I received the missing O-rings. I have not used it yet so no review for now. Doug

These installers are so easy to use and save so much time and brain power. I wish I could go back in time with a collection of these tools and check the alignment of all the covers on the engines that had shaft seal leaks, you know the ones. Two or three returns, two or three different brand seals. I bet now, they had misaligned covers causing the seal to be to one side.

Great product. Gives a piece of mind that the covers and seals are installed correctly so they do not leak.

Tool for rear main seal worked like a charm! Glad I got this set. No issues installing rear main seal on my 99 Silverado 4.8L.

Easy to use, works great.

These things are a god send. Great tool that'll continually use. Takes the risk of leaks right out, makes the job go smoothly and quickly.

If you are rebuilding an LS engine, you cannot align the front and rear seals without them leaking unless you use this tool. This tool gets it right in about five seconds! Worth the money.