Where to get strong internals for 4R100...?

[Silver6spd]

My buddy is looking to upgrade his 4R100 after it started slipping with his triple disk convertor. He tows generators 8k-20k lbs every so often and is always hooked to an enclosed 14" tandum trailer. He's wanting to know where he can get stout internals, valve body, and Look for billet planetarys kevlar bands and blue clutch plates. Or a kit with all that. His dad owned abd ran a tranny shop and shut them all down for retirement so he can get everything installed by his dad he just wants to know where he can get those parts. Thanks guys let me know. He's got the 7.3 with an SCT, k&n and straight pipe.

 

[bigtorque]

suncoast has a nice selection of hard parts.. however, there are trans modifications that a few of the pros add that you will not find in writing anywhere... BTS and John Wood both have their own custom tweaks, it was told to me once there is alot more to a high performance trans than just throwing parts at it.