You are most likley looking at a transmission from a deuce and a half military truck.
1) They came behind the multifuel engine.
2) They have a SAE #2 clutch housing (round with 12 bolts) they also have an adaptor ring to go to the larger #1 size like the flywheel housing on the multifuel. I sort of doubt that you can switch housings for one that works with chevy 4 speed, but I have not tried. I do believe that some of the larger chevy and GMC gas truck engines could be had with a SAE flywheel housing, but I don't know what models and sizes. All Detroit diesels and most all, if not all, other industrial type big truck diesels use SAE flywheel housings. And can use this transmission you are looking at (if #1 or #2).
3) I believe it is 0.84 to one, you should be able to look it up on the net with the specs for the 2.5 ton military trucks. If you can't find it let me know and I will dig through my books.
4) I think they are rockwell transfer cases, really big, almost 3' long, or tall, depending on how you look at it, and with a huge parking brake drum. Same thing, look on the net for the military stuff.
Hope this helps.
I was all set to buy one of these for my truck, they can be had at great prices, are very strong, and no problem to get parts for, or a complete second one for that matter. It's about the cheapest way to get overdrive in a strong manual that I know of.
Then I found out about the little Roadranger RTO610 and the newer RTO6610 10 speed overdrive transmissions, and that changed my mind on the spicer 3053A. I have two non overdrive RT610's and am still looking for the overdrive version for my project.
