6-speed help - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 08-12-2012, 07:35 PM Thread Starter
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6-speed help

Hi guys,

I'm new to the forum and have a quick transmission question. The transmission shifts fine and the clutch has entirely no slippage, but with the truck empty and not pulling anything i notice a whine. It is at all speeds in all gears and it winds down with engine speed and goes away completely when i push the clutch in. I immediately suspected the throwout or pilot bearings as the culprit. Decided to take it easy till i get a new clutch set in to replace it, but had to move a trailer a couple days ago. Overall load on the truck was probably about 3500lbs or so. It was making a very low toned thud when i pushed the accelerator. It isn't very loud and thuds at a steady pace with little variation. So my new guess at the root of the problem is the dual mass flywheel. Just wanted to make sure im headed in the right direction before i order parts.

I'm going to be converting it to a single mass flywheel using either the LuK or the South Bend kit. So pretty much anything in question will be getting replaced regardless. I'll be replacing the slave cylinder while i have it all apart. I've heard people mention different clutch forks and wasnt sure if that was something i should be looking at also, and i was also wondering if anyone made an input shaft upgrade for these transmissions. Wasn't sure as this will be my first time really messing with anything smaller than a 10 speed eaton .

Also was wondering if anyone had experience with the LuK and south bend kits good or bad. Also didn't know if i should be looking at the stock power options or a step up. I'm planning to put an exhaust, intake, and 6 position chip on it shortly.

Thanks in advance for any and all help.
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post #2 of 2 Old 09-08-2012, 07:58 AM
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i have a horrible whine/harmonic sound..coming from mine as well. Was hoping that the clutch assy install fixed it, but didnt. I went with the VALAIR clutch assy, new master/slave cylinder assy, the upgraded clutch fork.(same as whats installed in the 01-up). If power your increasing, then order the correct clutch assy. Ask the supplier the correct ?'s too.

For the "upgraded" input shaft, you'll have to disassemble the trans. Mine was all chewed up, so i went with a "kit" that you install a sleeve over whats existing of the input shaft stem, and a new pilot bearing that excepts sleeved shaft....

99.5 x-cab 7.3l, 6spd, 161k miles.....
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