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Re: Storing an auto trans - Cmyles? Posted by Cmyles [Email]  (#1126) [Profile/Gallery]
(more from Cmyles) on Tue, 4 May 2010 09:21:18
In Reply to: Storing an auto trans - Cmyles?, PaulS  [Profile/Gallery]
, Mon, 3 May 2010 20:01:07
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PaulS,
Let me start off by saying, I've only ever stored freshly rebuilt units and anytime I obtained long stored T37s they got rebuilt, mainly because they were "unknown condition" units. I suspect that you could store a fresh unit for a very long time as long as you kept rust from forming in it's guts. Having disassembled lots of these, what I've found inside may provide some insight concerning long term storage of a used unit. In a used T37 the friction elements have all been well impregnated with ATF and will remain that way, that's good. The seals and rings should be OK too. I think all that you can realistically do is store it in a dry place where it won't be exposed to temperature extremes and seal out any humidity. You should put the unit in an "airtight" plastic bag and include some desiccant like silica gel. Hopefully that will prevent rust forming on parts inside the transmission. Another concern is that the sludge which accumulates in the unit while in use will harden like concrete. Of course, freshly rebuilt units don't have any of that sludge (when they are rebuilt properly). When you take one of these all apart you'll find that sludge inside the clutch drums and everywhere, it's a conglomerate of freed friction material finely ground metal and other contaminates. When the car is in use it slowly circulates while constantly being produced. Some gets trapped in the filter, some sticks to the magnet and some just builds up anywhere it can. In a unit that sits for years I would expect that stuff to solidify in some bad locations. I can't think of any way to flush that goo out effectively that doesn't require solvent which could be harmful to the friction elements so I suppose that you just have to bag up the unit and roll the dice on that issue. Crazy as this may sound, I'd suggest disassembling the unit and storing the parts individually after cleaning them. Years from now when you need the unit you'll have to reassemble it but you'll know that it will be ready to go once in the car. If you store it as is, you'll install it, hoping that fresh ATF, heat and motion will flush and revitalize it but what if it doesn't? Then you end up tearing it down anyway. The best candidate for what you want to do (other than a fresh unit) would be a unit with very low miles and/or a reliable history of regular ATF flushes as it would have less than the typical amount of sludge inside. Hope this helps.
posted by 198.233....
, Mon, 3 May 2010 20:01:07, Tue, 4 May 2010 09:21:18 <-- Viewing This Message
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