Knocking Trans - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-30-2007, 12:38 PM   #11
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Default Update on knocking trans

Whats up guys!! I havent changed the fluid & filter yet ( going to today),But I haven't drove it since I added the sea foam.My Question is What brand of filter & fluid will be best considering my situation. A rebuild is definitely in order and the money saving process already started.
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Old 07-30-2007, 01:05 PM   #12
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Of all the fluids I have seen, the best I think is......drum roll........COASTAL. Get it at Autozone.

No kidding...it'* Autozones brand, but it is bar-none the thickest fluid I have ever seen. An excellent choice for old and worn-out slushboxes.
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Old 07-30-2007, 01:10 PM   #13
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I'm right there with Sandrock on Coastal.

I noticed that was the brand my mechanic buddy prefers.. , Jr's3800 has the cleanest fluid/trans and he uses coastal. My trans currently runs Coastal.
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Old 07-30-2007, 02:03 PM   #14
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First Thank you Sandrock & BillBoost for your input on the fluid. I'm headed to AZ shortly. But my next querry is... as I was browsing through various posts with similar issues I came across a few that reccomended adding an additional cooler for the trans. I could be wrong (doubt it) But my car has what appears to be a factory installed cooler mounted on top of the condenser/radiator assembly. Is this possible and if so would it be necessary to remove it for an aftermarket? Sorry no pics.
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Old 07-30-2007, 02:22 PM   #15
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That cooler you see...isn't the only cooler.

From the trans, a line goes to a "cooler" in the radiator, then from the top of that cooler, to the cooler you see on the front, and then back to the trans.

I've discussed with Don on how GM was short-sighted on the fact of having a cooler in the radiator. It cools in theory, but not in real-world. If at all possible, bypass that radiator cooler and just run with the external one. Or ditch them both and get a bigger cooler like I did.
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Old 07-30-2007, 05:22 PM   #16
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Agreed Sandrock.. the duallity can seem a little off base. I believe that they went throught the radiator to assist warming the fluid in the winter time and cold areas of the country.

With the current cooler on your car..there'* really not much need to add another unless you are upsizing it.
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