If you can notice a 15 HP difference then you will notice a difference. The TH400 is a stronger transmission although the TH350 runs a lot of these trucks. Ive blown up a few TH350's but I drive like an idiot. You rpobably wouldnt break it.
If you want to get rid of the TH400 after you change it out I'd like a shot at it.
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No truck :-(
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