I think this would work to pull the 3rd and 4th gear off, I have the bearing separator behind the synchro, I have new ones to replace those.
Wouldn't you know it Beater, 1/4" collet impact driver not enough testosterone to pull it. I don't have the 1/2" in the office. Will get it tomorrow, or wait until it eats me up.
So far I have disassembled everything without a hydraulic press. I do have a small one, but I need to dig it out...