Sorry for dragging up an old thread, but I did use the search function . Anyway I have a 32 gts4, running an rb25det. Now a few questions the general consensus is that gts4 boxes are almost the same as gtr boxes. Except gts4 boxes block is a bit different and a bit weaker? and the gearing is slightly different?
Now would there be an issue to worry about replacing the box with a gtr item? due to my running an rb25det? I assume I'm running a modded tailshaft due to this? ( pretty much a noob in that respect) but read that you need to do that when running a 25 in a 32. Would I need to get another customer tailshaft made up for a gtr box replacement?
Also is there anyway to tell if I actually have a gtr box or gts4 box under there. Ie something like a casting mark?
Don't know too much about whats been done to it driveline wise, as I bought it with the 25det in it already, Just know that the gbox is getting noisy and vibrating, and it maybe on its way out.