I rec'd the following PM from Adam, but I am responding here because I need to post photos (and can't do that in a PM): START MESSAGE Steve; I think the bottom drain bolts at 42MM (socket or open end wrench), do you know what the other two on the sides are? 17MM & 19mm? BTW, any trick to getting the bottom plug out, the one that I think is 19mm? Looks like you would stick a allen drive in there and then use an open end wrench to turn as there does not look like enough room for a socket wrench. Adam END MESSAGE Adam -- I'm not sure that all TRs have the exact same drive features on all of the various plugs. For example, in this (early) illustration from the TR OM, drain plug "A" for the transfer gear case looks to me to be drawn with a male hex feature, but on my (late) TR, this plug has a female 10mm hex feature: Image Unavailable, Please Login So with that caveat, here is a description of the drive features on the various plugs for the gearbox on my particular TR: Transfer Gear Housing Drain Plug "A" = 10mm female hex Main Gearbox Reservoir Drain Plugs "B" = 42mm male hex -- I use a 12-point 1 5/8" Craftsman socket that barely fits. Main Gearbox Reservoir Fill/Level Plug "C" = 12mm female hex -- This one is tricky as the frame crossmember limits the access -- I cut down a 12mm Craftsman hex wrench as shown in this jpeg (and then slip a short piece of pipe onto the long leg to get enough drive leverage): Image Unavailable, Please Login Transfer Gear Housing Fill Plug "D" = 12mm female hex I don't really follow your description "...what the other two on the sides are" - as the only plugs you should be fiddling with are A, B, C, and D. If you need anything else, or if you have some different drive features on your various gearbox drain/fill plugs, please post.