Those of you that have followed my 455 build thread will be aware of my desire to have a Land Rover Defender powered by a mildly built 455. The 455 is now built and so my thoughts are turning towards the TH400. I should state that right from the beginning it has been my intent to keep the Defender fully functional in terms of its 4x4 capability. I know of at least 2 Defenders with LS engines in them but both of those are now rear wheel drive only......what's the point in that you may ask. So some time ago I turned my thoughts to how I could mate a TH400 to a Land Rover transfer case, either the older (and possibly stronger) LT230 or the later Borg Warner. It turned out to be far more simple than I first thought. All you need are a large milling machine, an equally large lathe, a 7" diameter alloy billet, a piece of 30mm thick alloy plate, and numerous off the shelf items. The adaptor is in two parts, a circular part which mates up to the TH400 in place of the tail extension. This is indexed into the TH400 which enables correct alignment of the transfer case. The second part is a plate which has countersunk holes to allow bolting through the circular part and picks up the tail extension bolt holes in the TH400. The plate will also carry the transmission mounts and pick up the existing mounts on the chassis. The TH400 needs to be fitted with the 9 1/4" 4x4 output shaft. I dont need a speedo gear as the speedo feed is on the transfer case. If I use the later Borg Warner I dont need to worry about oil contamination as they both use ATF. If I use the LT230 then I'll need to fit an additional oil seal in the second step shown above to stop any possibility of ATF and EP80/90 mixing. I'm also using a cut down drive flange which if I remember correctly came from a Rolls Royce. Those TH400's certainly got around. This will bolt up to a modified transfer case input shaft. I'll be machining a flange which will be press fitted onto the transfer case input shaft and fully welded. It'll fit roughly where the lower of the two lines is. Before anyone asks, I'm confident that this will carry the torque as I know a guy with a similar flanged setup behind a twin turbo 383 and the flange is about the only part he's not broken. I'll still be using 3/8" high shear strength cap screws though. They're rated at over 12,000lbs in shear.