Fel-Pro BS 40644 Rear Engine Main Seal Set

Had transmission out and was an easy replacement of a rear main seal with this quality one.

Dry fit, no prelube or grease. So far no leaks! Felpro is always pretty great!

I started noticing oil droplets on my driveway and the transmission appeared wet in oil but it was not red so I knew it was engine oil. Sure enough, the rear seal had a small crack. I used a jack to support the transmission while a buddy removed the old seal and installed the new one. This seal is super easy to install with the tool it includes, slides great and it definitely seals great. I've had the seal for 7 months now I believe, and it is working perfectly! No oil leaks!

I used this on a 2002 F150, 5.4L 206K miles. While servicing the transmission, went ahead and changed out the rear main seal. Came with a plastic sleeve to aid in sliding it over the crank end. Sure glad I did, there's a lot going on while putting the seal retainer plate on the dowels, last thing I need to worry about is folding the seal lip, this eliminates the worry. Cleaned up the crank end as suggested, nice and dry before installing (according to the instruction sheet). Also, seems like this one is a step-up in rubber technology, it's PTFE and is supposed to be better according to Fel-Pro website. Got a few hundred miles on it so far, no leaks in sight. So, this looks like a good choice for the extra couple dollars versus the standard rubber one, I am pleased.

This one piece rear main seal (Ford 5.0L casting from 1983 forward) can be installed without a driver if you loosen the rear main bearing cap just a little, then torque it back down. I did that and haven't had any leaks on my new engine build.