I can't remember the name of the part (valve I believe) that can cause shudder. I believe it holds pressure on the TC? Last I heard they were $30 and aren't they behind the pump? After searching for an hour I ran out of will to find this in old threads or google

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

Search here
http://www.sonnax.com/units/288-545RFE

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U.S. Army Retired

Thanks Flash. I checked that out, but there are at least a couple of valve upgrades I think. I was trying to advise someone before they reinstalled their transmission without it.
My personal experience is that I didn't upgrade that valve, and I still have shudder. But, I'm first going to replace by Solenoid pack as it buzzes really loud, and can also cause shudder. Maybe I'll get lucky and not have to drop the transmission again

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete