T-400, semi metallic waffle plates in stock rebuild...good idea or a bad one? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-17-2010, 10:32 PM
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T-400, semi metallic waffle plates in stock rebuild...good idea or a bad one?

I'll start by explaining what I plan on doing. I've already tried the street/strip mods and although cracking the tires loose at full throttle in a 2-1/2 ton car was cool, I've decided I want the stock feel back. It was fun while it lasted and I learned a lot about th400's in the process.

I'm now doing a stock rebuild, '66 switch pitch 400. .030 on the direct w/ wavy plate, .035 on the intermediate w/ wavy plate, and whatever gap on the forward w/wavy plate. (probably around .060).

Later model vb with later style filter and deeper pan, Transgo shift kit w/ new vb plate and yellow pump spring. I plan on leaving the holes in the plate the way they come, 6 check balls, (I think the non functional one may have something to do with part throttle downshift not sure though so I'm leaving it in)....and no spring on the 1-2 accum valve in the vb. (I can always make changes if needed). Plain spring on the 1-2 accumulator piston. Not sure yet if I want to mess with the 2-3 shift, I plan on using the red spring under the 2-3 accumulator and see how she feels. I prefer smooth crisp shifts, but prefer not to feel a bump.

I've heard semi metallic clutch plates in the direct clutch tend to chew up the steels and can cause harsh shifts. I would think that in a stock rebuild, the longer shift times could be even harder on the steels. So I'm undecided about going with stock paper clutches or not. I'd think semi metallic might last longer b/c they can take the heat better. Maybe my clearances are too tight? I'm sure someone here can offer the best advice.

Thanks in advance, I will appreciate all replies.

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Old 07-18-2010, 06:27 PM
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I've never seen a problem using the frictions you mention.
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Old 07-18-2010, 07:58 PM
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Quote:
Originally Posted by Crosley
I've never seen a problem using the frictions you mention.
Thankx for the reply. Do you think .030 clearance is enough with semi metallic plates or is that too tight?
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Old 07-18-2010, 08:39 PM
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Quote:
Originally Posted by Big Buick
Thankx for the reply. Do you think .030 clearance is enough with semi metallic plates or is that too tight?

too tight

.040 to .060 on all of them.. even up to .070 on the direct clutch is fine

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Old 07-18-2010, 08:44 PM
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Quote:
Originally Posted by Crosley
too tight

.040 to .060 on all of them.. even up to .070 on the direct clutch is fine

I guess it pays to ask questions, I'll shoot for .050. I'm using oe type Raybestos paper clutches in the intermediate pack.
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