task Posted August 20, 2015 Share Posted August 20, 2015 I'm fitting a bigger engine to my auto RRC and I've heard a few horror stories of flex plates letting go, has anyone ever solved this problem? A chat with a friend who has managed to kill two seems to suggest he solved it by fitting two flex plates. I had also considered getting a new one machined out of a thicker material? Or is all this just me being a little paranoid... Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 20, 2015 Share Posted August 20, 2015 If you fitted two flex plates, I'd think you'd need to change the shims, otherewise you are in danger of smashing the oil pump to bits. I have ~240BHP and stock HP22 flexplate with no issues. Quote Link to comment Share on other sites More sharing options...
task Posted August 20, 2015 Author Share Posted August 20, 2015 A friend has a 4.6 with merlin heads and ported inlets, he regularly pulls a trailer, he's killed two flex plates but has been running with a "dual plate" setup for a few miles now. I guess being a bit more gentle with the right foot is an option Quote Link to comment Share on other sites More sharing options...
duncmc Posted August 20, 2015 Share Posted August 20, 2015 The flex plates break on the 3.9's too, so it is not just related to more power or torque. Maybe it's just a case of fitting a new plate that isn't fatigued when you do the swap for peace of mind. Quote Link to comment Share on other sites More sharing options...
Mike174 Posted August 27, 2015 Share Posted August 27, 2015 I managed to kill the torque converter and flex plate in my 200tdi auto. Do have 37s and a pair of lockers though. Quote Link to comment Share on other sites More sharing options...
Carloz Posted September 1, 2015 Share Posted September 1, 2015 Wheel size, lockers etc. do not especially kill flexplates. The engine torque, drivingstyle and milage (= fatigue) will. Another thing to consider is the accuracy how engine en box are lined up. I can immagine that due to production tollerances you can have now and then a bad engine/box combination which kill flexplates. Quote Link to comment Share on other sites More sharing options...
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