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Old 06-15-2008, 07:08 PM   #1
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Default 4L80e rebuild. Direct drum, 5 plates with wave plate, or 6 plates without wave plate?

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I finally got started on my 4l80e rebuild. I'm to the point of rebuilding the Direct Clutch assy. I have a Transgo HD-2 rebuild kit and I replaced the springs on the direct drive assy, but the Transgo instruction specify to make sure and use a wave or cushion plate with their kit. My trans had already been rebuilt for performance. It had no wave plate and stock return spring, but instead had additional composite friction plate.
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SO.......
Which is better?
A direct drum assy with 6 sets of plates, stock springs, with no cushion?
OR
A direct drum assy with 5 sets of plates, Transgo springs, with a cushion plate?

It seams to me the additional plates would have a better 2>3 shift, but the heavy duty springs would have a better 3>2 down shift.... sound right?
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Old 06-15-2008, 07:21 PM   #2
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on my 400s I personally leave out the wave plate and take every other return spring out. if you use thinner steels and a thin piston you can stack 7 frictions in it not that its needed but you can lol...To add this is on my personal builds.
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Old 06-15-2008, 08:09 PM   #3
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I took out the wave plate also.
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Old 06-15-2008, 08:18 PM   #4
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I have 8 plates in mine. It came stock like that. I got rid of the spring steel cushion plate for a old type th400 steel wave plate. Still 8 frictions.
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Old 06-17-2008, 05:18 PM   #5
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i talked to a transgo they said ALWAS ALWAS run a wave plate. the tech said you will brake an input shaft before you slip that clutch.
??????
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Old 06-17-2008, 06:38 PM   #6
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Quote:
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i talked to a transgo they said ALWAS ALWAS run a wave plate. the tech said you will brake an input shaft before you slip that clutch.
??????
Yea my dually can chirp second and third with the waved plate. Some builders recommend two waved plates.

Just don't use the stock blue spring steel convex plate, they break. Use the old th400 waved plate.
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Old 06-17-2008, 08:42 PM   #7
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The stiffer return springs are there for few reasons. One, quicker downshifts. Two, smoother apply at light throttle openings. Three, they keep the clutches from getting into trouble in the top end of first gear from accidently coming on from centrifuging. The waved steel/s keep/s the splines from taking a hard hit by preloading it. In otherwords the waved steel takes up the slack before the clutches are completely applied. You won't feel the difference when using a waved steel, but the transmission will know in the long run. Do not leave the center seal out of the direct/reverse drum, as this can aggrevate the centrifuging situation. Set the clutch clearance at .060" - .080". This makes for a smoother reverse, by allowing the rear band to come on first instead of this clutch pack applying first. Also when making a 2-3 manual shift, it will allow the 2nd gear band to come off completely before the 3rd gear clutches come on, this will prevent the band from glazing.
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Old 06-17-2008, 08:42 PM
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4l80e, auto, automatic, clutch, direct, drum, plate, rebuild, rebuilt, th400, thread, towing, trans, transmission, wave, waveplate


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