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Message: [QUOTE="f350guy, post: 1256229, member: 11669"] Remember, this was around four years ago. So I am sure some things have changed for internals regarding what is needed and what is not for specific power levels. No clue what mine will hold and have no desire to test the limits. Stock will hold over 500rwhp for a while and it seems the converter craps the bed first, followed by the direct (5th gear) clutches. I know Raybestos recently released their 'GPZ' line of clutch plates for these units. So now you can choose between the Alto Red Eagles or the Raybestos GPZ. How they compare to the Alto, I do not know. Either are better than the OE. I have used Alto's Red Eagles for years in my AOD vehicles and they work great. I am having a set done for a ZF 4HP24 in one of my cars. Here is TCS' current offerings for the 5R110W - [url]http://www.tcsproducts.com/products/subcategory/5r110/[/url] You can visually see the upgraded neck area on the splined end compared to stock. I ordered my parts from Rudy's and Aaron himself told me to skip the shaft for my plans as it was not proven, plus he was running a stock shaft early on in his race truck. I cannot recall the exact issues with the ones that were available, but the dead site (powerstroke.org) would have the information on a search. When I need a refresh in the future, I will be upgrading the intermediate shaft at that point. Here is a good picture of the two shafts, I think this is a build from a member's truck here - [url]http://image.trucktrend.com/f/tech/ford/1307_2008_ford_f_250_international_threat_part_1/46631056/2008-ford-f-250-international-threat-part-1-intermediate-shaft-comparison.jpg[/url] My truck is a Job 2, 2009 (May 27, 2009 to be exact) ... so I already had the five pinion OD planet and intermediate shaft. So you will have to know when your 6.4 was actually built to hopefully narrow that down. I have seen a bunch of '08 MY trucks built in 2007 and I swear I saw one from 12/06. There were other internal hard part updates between the early and late 5R110s, yet I am pretty sure aside from the 94T and 99T bits, the rest was all updated by the time the 6.4 rolled out as mid production 6.0 upgrades. A guy that builds these for a living will be able to answer cutoff dates more exactly. I run a stock stall speed RCD converter. Chose it as I plan to keep compounds similar to stock. No more blowing through the converter, even on mild tunes. Hope it helps. [/QUOTE]