Just had my local race shop install my suncoast, and they had a reputable trans shop do the shift kit. 1400 for the install later it had completely eliminated my 50 mph drivetrain shutter. I was really loving it. Then just a week after install a terrible vibration/shudder developed at idle rpms in neutral, park and even worse in drive. No shudder/vibration exists in reverse gear. What the hell is going on. Any ideas?

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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

Mebbe the race shop raced thru the install and left half the bolts out, or all loose: bellhousing\torque convertor - opposite torque twist in Reverse

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

What did your race shop answer to that exact question? Have them check the TC bolt torque settings via the inspection hole, while they're checking the tranny housing bolts per GMCTD's suggestion and the u-joint flange bolts.

Did you ask the people who subcontracted the job out to the tranny shop what's wrong? Did they inform you they would sub the job out? Did they hint that the Suncoast was at fault? From your subject line it appears that you believe that is the problem area.

Keep us informed.

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2005 LTD CRD RB1 NAV/Htd Leather seats/Amsoil EA filters
SunCoast Mega Trans & Billet TC/PML pan/Aux cooler
Fuel cooler/Lift Pump/10um Pri/Racor R490 2um Sec Fuel Filters
IronMan Lift/Shocks/Provent/Moog ball joints/ V6 Airbox/Fan/Hayden
Cobalt Boost/EGT/Oil/Trans/Volt gauges/Aeroturbine 2525
Yeti Hot Tune/Odessey 65/Samco's/Michelin Defenders

its odd problem fixed itself after few days, now when i put it in reverse sometimes doesn't go in to reverse, nice

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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

doesn't sound like the problem fixed itself it sounds like it's goin to crap

shudderings one thing, shuddering then losing gears is another

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03 Renegade (Black)
177k miles 3.7L gas - 45RFE
Command Trac / 4.10s
Lift: ft. 790+ rr. JBA4+
The last of the TrailReady Front&Rear Bumpers and TR Rock Rails
Jarhead Offroad light covers
31x10.5R15 RedLetter Grabbers on Blackrock Dunes
L.O.S.T #KD098632

basics -
did you 2x check the fluid level and that they filled it with the right +4 fluid?

several shops have tried to use regular fluid and the clutches have problems,
also replacing the converter - commonly leaves air bubbles which come out after you cycle everything a couple of times.

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

+1 to ATXKJ

Deff check fluid level, especially when your having issues getting started in reverse or first or stalling as you come to a stop.

Obviously it's difficult to fully fill the trans w/o driving it and rechecking repeatedly.

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06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe.
Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler.
Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims