Join Date: Nov 2016
Location: Ottawa, Ontario
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The 2004R that is in my GTO has a ProBuilt kit in it rated to 550hp
Yes -I am told that it was a direct bolt in. The bell housing matches the pattern on the 400 and the transmission mount holes are located in the same spot - no need to move the cross member.
My understanding is that ProBuilt have shuttered their business, which is unfortunate because their kits appear to be bullet proof. I am not gentle with my Goat, and while she is running a pretty tired, basically stock 400 and likely only throwing around 320hp I run her hard, manually up and down shifting all the time.
I am sure that there are other very reputable transmission builders out there that can set up a 2004R for you.
As always, YMMV
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