Transmission 3rd and 4th gear fall out

[Rocket Man]

You my want to check out sonnax web site. They have a 4l60 heavy duty truck build. I just built my self but have not installed yet ,hope it works. But any way sonnax said beast is not the way to go. Check out their smart shell. Not trying to step on any toes! So hope no one is offended that I am dissing the beast!

I went with a Performabuilt level 3 "invincible" 4l60 for my cammed/ blown 6.0 with headers and they use the Smart Shell in it. They make some serious stuff, mines rated for 800 RWHP but of course it's the weight of our rigs that kill these. It was $3500 for one with a 2 year warranty but if you look at what they put in it, as well as their proprietary machining they do, it's worth it IMO. www.performabuilt.com