Ok, i have been a member here for awhile now and this is the FIRST time i have noticed this section on the builders page. So, i decided to share a wee bit of painful knowledge that I have incured during my build. Here are the 2 MAIN things I have learned with safety: * High lift jacks are great and a handy dandy tool in deed...but are intended for certain use. Useing a high lift to jack up the front of a jeep with nothing else to support it while you take a tire off or do ANY OTHER WORK ON THE JEEP WITH NO JACK STANDS will result in the jeep getting the sways and flopping over onto the pavement. I did not learn from the first time and I held the jeep by a tow hook for over 10 minutes with the high lift at a steep angel leaning away from me untill I finally had to let go and bail out. (could not pull the jeep back up right because when the jack gave, it slid the base towards the passenger side about 4 inches, just enough to not allow the jeep to steady itself again.) Did the same thing again a month later but luckily my buddy was there to lend a hand and we got it leveled out without the jeep falling again. * While installing my np435 WITH the dana 300 attatched ( not a good idea without proper tools), i got a bright idea to use a 4" rachet strap anchored to my roll cage to hoist the combo up and in position to stab it in. My idea worked great...untill the rachet itself stripped a tooth and unlocked itself resulting in the tranny and tcase to come crashing down on my buddy and I who were laying under the jeep. Now granted, the combo was less than a foot above us, but it dont take much for that kind of weight to hurt you purdy good. Bottom of tranny case caught me square in the chest while the tcase took out my buddies right shoulder. pure accident but use some other means of hoisting when dealing with big weights and try to stay out from under neith it. Saving a couple days instead of waiting for the proper equipment is not worth the injury or worse. Happy jeepin and wrenchin.