TH400 drum and sprag in a TH350? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-30-2008, 09:49 AM
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TH400 drum and sprag in a TH350?

Will a TH400 34 tooth sprag and drum fit into a TH350 tranny?
I kind of doubt it but I read someone else did it.
I'm hoping to have enough parts for one good tranny.

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Old 06-30-2008, 10:37 AM
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TH400 sprag into TH350?

No, they don't interchange. There are trasmission companies (TCI, ATI, Transmission Specialties, BTE) that offer a modified TH350 drum with a 36-element sprag on it in place of the factory roller clutch assembly. Maybe this is what you've heard of?
I have used these, kind of pricey at around $250+, but the only way to really strengthen this area of a TH350 when the aftermarket hardened stock-type assembly won't hold up(Drag race 400 cube with sticky tires).
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Old 06-30-2008, 11:25 AM
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Thanks thats what I tought.
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