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Chevy turbo 400 filter question

Discussion in '40- & 55-Series Tech' started by llih, Aug 16, 2006.

  1. llih

    llih

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    I posted a while back about a whirling sound that was coming from the trans on the tow vehicle. This occurred after switching to Mobil 1 synthetic atf. After some research I found a bit of info that said the O ring on the filter neck might be bad. I dropped the pan and replaced the O ring. While I was underneath the trans it occurred to me that the bolt holding the filter might be wrong. The bolt is about 3 inchs long, the bushing about 2 inchs. The bolt passes thru the filter, then the bushing, then is screwed into the trans body. When the bolt is screwed into the trans tight, there is perhaps a 1/2 inch of travel on the bolt where the filter sets. The filter can move up and down the 1/2 inch space between the bushing and the head of the bolt. Is this normal or correct? It seems to me that the filter should be tight against the bushing and that the bolt is a little long. I had the trans rebuilt about 5 years ago and it has been this way every since.
    Thanks Brad
     
  2. Black Dog

    Black Dog

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    I don't wan't ot take away from your question, but I have the turbo 400 in my cruiser with the exact senario, although I did'nt have the bushing that you are refering to. I just figured the bolt was too long and replaced it with a shorter one. I't now sits flush (tight) against the bottom of the trans. So far I havent had any problems or funny noises, but it has only been driven short distances. I hope someone has the answer to this.
     
  3. llih

    llih

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    Black Dog I got an answer at Pirate. The bolt is supposed to be long with the slop so the filter doesn't make any noise. You should maybe get a bushing and put the long bolt back in. Your filter might set a little high with it bolted tight against the trans.
    Brad
     
  4. Black Dog

    Black Dog

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    Thanks Brad

    I was worried that it might sit to high. I saved the bolt so I guess I just need to find a bushing. Man I hate draining that trans. Thanks again. Jason
     
  5. llih

    llih

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    Black dog, you can make the bushing. I think a piece of 1/2 or 3/8 inch copper pipe would work. Leave yourself about a 1/2 inch slop after the bolt is screwed in. A couple of things you might want to consider. Buy a drain plug kit and install it on the pan while you have it out. I read that the filters do not need to be changed all that often. Just the fluid. Much easier than dropping the pan. Might want to get a new O ring and install while you have it off. I had already installed a drain, so it was easy to recover the new Mobil 1 synthetic fluid in a clean container. I didn't lose even a qt.
     
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