Point well stated and taken gentlemen. Thank you.
I'll look for some, pre upgrade pics as soon as I can get my older laptop, at home, up and running. I'll also try to take some more pics of the "big picture" when I can. I'm using my snazzi new phone for the pics because my digital camera is sketchy at best.
I started this thread with some info on me and the reasons for my upgrade, so I'll skip that in this post. I've been planning this upgrade ever since some dude in the dunes blew past me in the rough stuff and I couldn't keep up. That, and the fact that one of the younger guys in our group called my sand rail "old school", even though I have an MS2 digital fuel injection system installed and have mounted a, small, touchscreen, laptop for datalogging and tuning. Busting all the teeth off of the ring gear, again, was the last straw. But, the planning had been done, in my mind, for years.
I decided to go with a 10 degree forward tilt on this transaxle for a couple of reasons. First, when I first bought this frame, (at the tender age of 21), I didn't realize that it needed support bars between the transaxle horns and the cross bar directly above it, so, I left them out. 3 months later, I had a busted nose cone because the trans had dropped, under a heavy jump my brother did, and bent the horns downwards. I cut the ends off of the horns, sleeved the ID of the tubing with 1/8 wall pipe, and welded it all back together. I assumed they were straight, but was wrong. My engine had rested slightly below the rear engine cage ever since. Before I removed the broken transaxle, I checked the angle it was resting at by placing an angle finder, (angleometer), against the bellhousing, and writing down the number. At this point, the back of the frame was on jack stands, but not level. It didn't really matter to me what angle the frame was at, since I just wanted 15 degrees in the opposite direction, (10 for the new tilt angle, and 5 to compensate for the bent bars). I had read, (on this forum), about the advantages of tilting the trans 10 degrees, (nose down), and decided it sounded like a good idea to me. The bus to bug adapter mounting kit I bought with the 091 trans did not fit my sandrail. Even if it did, the tilt angle would still have been with a 5 degree "sag". So, I cut the mount, at an angle, for strength purposes, and so that I could salvage the original mounting hole positions for the transaxle, as well as the holes that locate the trans mount to the horns, since this is where my rear engine cage also attaches. From there, I welded a supporting "cross member" under the trans front bearing carrier. I've always added this cross member to my builds because it makes installing the trans easier by giving it something to rest on, and because I don't like the strap over the bearing carrier to force the trans down without anything underneath it. With the cross member in place, the front strap clamps the trans down instead. Bolted the front, adapter, mount to the trans, and added the needed gussets etc. to hold it to the torsion housing, and the new crossmember.
With the front mount and cross member in place, I tilted the trans at 15 degrees, (explained earlier), and cut some steel plates to take up the gap I had created in the rear trans mount. Gusset the sides for strength, (and to hide some unattractive welding I did), and paint it. Remove the rear mount again to drill, (on a conventional mill), the holes that the rear engine cage bolts up to and reinstall. This is when I stripped out the aged threads in the nosecone, prompting the installation of the helicoils. Helicoils, (named for the helical coil used), are a commonly used thread repair system that replace stripped threads with a, formed, wire coil that creates a new, stronger, thread to bolt to. The helicoils are stronger because they are made of stainless steel or carbon steel. Also, they spread out the load form screwing the bolt into them across their entire length which prevents stretching the threads as you would if bolting into aluminum or other soft material. I used a 3/8-16 helicoil kit for my repair, since it was close enough to the original 10mm. bolt size, and I had one at work that I could use, whereas I didn't have one for the M10 threads. I recommend them to anyone repairing a stripped thread or installing a soft material part that is going to have the bolts removed and replaced frequently. I also used them on my steel shock mounts years ago and the are still intact and functioning fine, but about to get cut off so that the new shocks will fit.
OK, my fingers are tired now, so I'll add more later.
Feel free to ask any questions you may have and thanks for tuning in.
Dev