On the jeep in my avatar 134L T-90 D-18 D-41/25 warn hubs. Dad took the pill out of the transfer case to allow him to better pace Marching bands and such when he would be in parades (he was in the Marion County Sheriffs Reserve Search and Rescue) Then later when I stated driving it in High school he told me I could go any where I could get in 2wd low but when I got stuck we were to put in the Hubs and get out and come home he was coming to get us (good thing cause sometimes we were 300+ miles away!) I drove the crap out of the Jeep we did stuff they either should have made commercials with or put us in Jail. I never so much as damaged a thing in that drive train in 3 years of driving it that way every chance I got. I'm now building that jeep to suit my current wants. Souped up 134L 9.25" clutch T-90 all new gears and shafts built by one of the leading experts in rebuilding trannys and transfercases (Kaiser Willys and Walcks sell his units as Does Herm) I have the last twin stick large shaft version of the D-18 and I have a Dana 44 30 spline flanged from a 71 CJ-5 with an Eaton E Locker and all new G2 Gears and SKF bearings and a competely rebuilt Dana 25 with really nice Original gears. And I will not be bothering with the interlock pill. But then I'm about 400 HP short of what it would take to break one of them massive rear axle shafts.