Black crud on bottom of trans pan

[84 Shorty]

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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[Honky Kong jr]

Yummy clutch soup.

 

[CSFJ]

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]

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?

 

[Dougnsalem]

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]

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]

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

 

[Snoots]

That beats anything I've ever seen. Ugly....

Fugly!

 

[Dougnsalem]

Funny. I wanted to see this rainbow casting. An external Google search sent me to this really good thread....

http://www.gmsquarebody.com/threads/how-to-identify-a-700r4.1865/

 

[74 Shortbed]

Yep, there is some good info there..

 

[84 Shorty]

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.

 

[CSFJ]

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

 

[84 Shorty]

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.

 

[CSFJ]

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

 

[84 Shorty]

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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