Thanks for sharing your experience. Did the Suncoast unit shudder from the beginning or did it take awhile to show up? If it took many thousands of miles to show up then it could be the bolts backing out. If it was present right from the beginning then I find it extremely hard to believe it can be blamed on the bolts especially since you torqued them to the correct spec with your torque wrench.

I also didn't get shudder with the old TC with GDE Hot Tune at WOT runs as the TC wouldn't lockup at the lower rpm's where enough torque was generated to bottom the springs out. But once locked up in 3rd-5th if my rpm's where below ~2k I could get shudder at will.

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2006 Jeep Liberty Limited CRD
GDE Turbo Kit and TCM, European Torque Converter, Lift Pump, V6 Air Box, Magnaflow Muffler, Stanadyne FM100 2um Fuel Filter
2011 BMW 335d
2004 Dodge Ram Cummins, lots-o-mods
1990 YJ Repowered with 06 Cummins B3.3T
2005 Kubota BX1500

If it Shuddered from day one and not after some extensive driving indicating bolts coming loose, any good Torque Converter supplier including SunCoast would warranty it. I would go so far as to believe a trustworthy online supplier such as MoparPartsAmerica would do the same, some Stealers on the other hand would be a case by case basis.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

I have the original suncoast converter and the gde hot tune. I always had some shutter around 45-55 mph but after recently racing a buddy on the highway near 110mph. I now have terrible shutter. What happened im sick of this shutter bs.

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2006 Jeep Liberty Limited CRD - DRL's activated, Moab wheels and 215/85/16 Goodyear Duratracs, Frankenlifted, Cummins Lift pump, Magnaflow 2.5" all the way back, no cat , suncoast, Viper command start, Valentine One.
1967 Jeep M725 - a real cream puff

I would call and talk to Ron over at Suncoast. they are really good to work with, and since i have the new springs no shudder. the only issue that appears now is; when i come to a stop the suncoast seems to bring the engine down a bit more than the stock. it never stalls, i assume b/c it heavier.

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"Never mind the maneuvers, go straight at "em," Lord Horatio Nelson

2005 Jeep Liberty CRD

Sorry to hear about your troubles. That sucks. Could you give us more details on the history of your vehicle? Things like was the GDE HOT tune before/after the TC upgrade, who did the TC upgrade, what type of ATF fluid was used, was the pump replaced/altered/left alone, etc. There was a recent thread about those 4 bolts coming loose that caused a bunch of problems . . .

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2006 Jeep Liberty Limited CRD
GDE Turbo Kit and TCM, European Torque Converter, Lift Pump, V6 Air Box, Magnaflow Muffler, Stanadyne FM100 2um Fuel Filter
2011 BMW 335d
2004 Dodge Ram Cummins, lots-o-mods
1990 YJ Repowered with 06 Cummins B3.3T
2005 Kubota BX1500