Huge ass cooler on the E4OD for sure.
Also, 1k is a CHEAP price for getting gears set up. There's a vendor here that just started offering nice package prices for gears F&R with master install kits. The 8.8 isn't bad, but the TTB has to be just about completely disassembled to do the gears in it, and while you're in there, you might as well do a few other things too.
If you have to ask about gears, IMO, you aren't capable of doing them yourself. Theres tolerances that have to be within the thousandths of an inch , not hundreds IIRC, or else you'll trash them.