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out of the two, you'll find that the thm400 is a better transmission all around. it was a more heavy duty built transmission than the thm350, and it does last a lot longer. we had built up a 77 gmc sierra classic with a 350 4 bolt, and it was pushing near 500 hp. tore apart 3 thm350's before going that little bit bigger, never had a problem with the used 400 we bought. just from my experience, the 400 is a better transmission, a little harder to come by, but much worth looking

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Q: What transmission is better the thm350 powerglide thm400 or the 700r4 its going to be used in a el camino for drag racing?
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