Black crud on bottom of trans pan

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84 Shorty

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Decided to do some preventative mx on my truck today and change fluids out. Dropped the transmission pan to replace filter and gasket. Noticed all this gunk at the bottom.

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CSFJ

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Yummy clutch soup.
yep, that's all clutch material. That's a pretty impressive buildup too. We rarely see that much from the development units they abuse on the dynos. I predict a rebuild in your near future.
 

84 Shorty

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Awesome...if I was to start looking for a 700r4 what should I be looking for? Are there certain years better than others? I know a K stamped case is important but what else?
 
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Dougnsalem

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yep, that's all clutch material. That's a pretty impressive buildup too. We rarely see that much from the development units they abuse on the dynos. I predict a rebuild in your near future.
That beats anything I've ever seen. Ugly....
 

CSFJ

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Awesome...if I was to start looking for a 700r4 what should I be looking for? Are there certain years better than others? I know a K stamped case is important but what else?
I was always under the impression that the "K" case was a 4x4 unit, I could be wrong however. Iirc anything after '87 or '88 should be good.
 

74 Shortbed

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Yep, 87 and newer.. Easy identification just look for the rainbow casting line on the right side of the case..
 

84 Shorty

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If all that black sludge is clutch material my truck shouldn’t even be able to move. I drove it just the other day and shifted fine.
 

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Lol, how's it doing now that it has new fluid, and anything resembling friction material is no longer suspended in it?
 

84 Shorty

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I have to go get more transmission fluid, so I haven’t drove it around yet.
Lol, how's it doing now that it has new fluid, and anything resembling friction material is no longer suspended in it?

I have to go get more transmission fluid, so I haven’t drove it around yet. It took every bit of 4 qrts, and it’s barely showing on the dipstick. To be honest I’m not sure how long is was drove around low on fluid.
 

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I want to say that the last fluid/filter change I did on the 700r4 in my '88 took 5 quarts.
 

84 Shorty

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Well folks, I reckon I’m going to have my th350 rebuilt. I’ve been juggling around the idea of going with a 700r4 for OD and lower rpms on the highway. But I think I’m just going to change out my gears which will help a lot. I currently have 4.10 gears, do you see a problem stepping down to 3.08s? I don’t haul or really tow anything. Here’s the comparison chart between gears, 1K difference in rpms:

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