I have my LS3-4L75E installed but not really satisfied with how it sits. At this point I'm looking at trimming the upper floor panels as well as the forward part of the frame where the parking brake handle would mount - on both sides just to be able to remove the pan for future maintenance. Before I do that I wanted to get some feedback. I assembled the trans mount and adapter using the supplied 1-1/4" spacers but those spacers could be shortened quite a bit if in fact the trans needs to be lower. At this point I can't get the trans tunnel to fit down to the floor and think that would also be solved if the trans were lower.
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