Random rattling noise from bellhousing area

[orrum]

I looked b4 to find the mod thread but I cant find it. My truck drops rpms and feels like a 5th gear when I let off the throttle @ about 50-55.....is that the TCC unlocking? I tow in OD. It runs cooler.

 

[Chief915]

I looked b4 to find the mod thread but I cant find it. My truck drops rpms and feels like a 5th gear when I let off the throttle @ about 50-55.....is that the TCC unlocking? I tow in OD. It runs cooler.

Here is a link to "how to do" this mod.

http://blog.heathdiesel.com/2005/11/manual-operation-of-torque-converter.html

Yes, that drop in rpm's is the converter UN-locking. Having the switch so you can keep it locked is a great, and really easy, mod. Keeping the converter locked while you're towing will keep transmission temps down and will also help out with slowing down while you're towing. You can lock the converter going down a hill, take your foot off the pedal and it will slow the truck down almost like an engine brake on a big rig would.

 

[orrum]

Thanks a bunch Chief, gonna look at it and hopefully I can manage it. Are there any downsides to a TCC mod?

 

[Chief915]

Are there any downsides to a TCC mod?

Short answer, no.

It does take a little getting use to if you use it a lot. It takes some trial and error to get use to the right rpm range in which to lock the converter, lock it to low and you lug the engine, lock it too high and you lose some of the benifit of locking it in the first place.... But like anything else with your truck, once you "know how to use it" it is great to have.

 

[orrum]

Just read the link and I believe my retarded mechanical self can handle that!!!! I been envious of my neighbors allison cause it can brake him down a mountain so now I guess I am gonna have a poor mans allison!!! I will let u know how it goes Chief! Once again TTS and its members ROCK!!!!

 

[Chief915]

That "hill decent" feature of locking the TCC is probably the best thing about it. I used that quite a bit on this trip I just did. It is well worth the time and effort it takes to do the mod.

Almost like having a jake brake

 

[Acesneights1]

You could even make a jake brake recording on a tape recorder and wire it in to the switch....:rof:

 

[orrum]

Ace only u n me r hillbilly enough to even consider that!

 

[Chief915]

You could even make a jake brake recording on a tape recorder and wire it in to the switch....:rof:

That's actually not a bad idea......

 

[Acesneights1]

Ace only u n me r hillbilly enough to even consider that!

I resemble that remarks.....Ever see the "General Lee" wheels on my CUCV ? I had to search high low for those....:rof:

 

[orrum]

Hey at least u wouldnt forget to turn it off!

 

[Jimmy-Bones]

I was having the same issue with my th400 in my 82 k20, turns out the bottom bolt on the transmission (drivers side) was backed out and the transmission was separating from the block close to 1/4 inch. Torqued it down knock went away. Before I knew what it was, it would come and go but started sounding worse the last few days. I'll keep everyone posted if it was the issue causing the random knocking.