Transmission
First of all, here's what I have going on here... When I planned my build, I wanted to have a 1 ton set up all around for trail riding and crawling, and be able to do highway speeds there and back. So I read and read and thought the NV4500 was what I wanted bc of its 5th gear. I found one for a few hundred bucks, and mated it to an Atlas 2.
Well once I got it all together and running on its own, I am convinced that the 3-4 syncro has gone out, Because I cannot shift into 4th gear with out grinding, unless pausing when coming out of third for a couple seconds. Reading online about the syncros in these NV4500s, you HAVE to use the factory Syntorque oil. I am guessing that the previous owner did not. SO I am thinking it needs to at least have this 3-4 syncro replaced.
In calling around to transmission places to check prices for a rebuild on this thing, I am realizing why the original owner was selling it for so cheap instead of rebuilding it himself. One place even told me that I'd be better off buying a new one than rebuilding the one I have. -Not gonna happen.
In driving my FJ the short time I have had it together, I realize that I really don't need the 5th gear for the highway driving at all... @65 mph my SBC 350 turns just under 2000 RPMs, way low. Great mpg, but...? Asking around, I have had a couple of suggestions for transmission swaps. All have pros and cons.
Keep the NV4500 and dig into it. Pros are: All of my transmission and t-case mounts, skidplates, fabrication work is done for this transmission already.
Cons are: I have NO IDEA how to rebuild a transmission, no tools other than basic hand tools, no press... ect. And best case scenario is that it only needs one syncro, How much will THAT cost me?
Swapping in an SM465. Pros: DIRT! CHEAP! I saw a listing on Craigslist of 2 for $300, and I have heard that they are bombproof, (if you can keep them in gear). If I am not mistaken, the NV4500 is the transmission that replaced the SM465?
Cons: The fun of finding one that is is great condition that I do not have to do anything to, except maybe working on the sloppy shifter they all have.
The output shafts are 10 spline, and the input on my Atlas is 32 spline. I know that there were later 32 spline SM465s, but the shaft is much longer. So, I would have to swap the input on my Atlas. That work is above my head.
The dimensions aren't the same between the NV4500 and the SM465, so I would more than likely need more fab work done.
Putting in a TH400 or TH350... I just simply want this FJ to be manual shift. I have considered these options, but no. If it were a rock rig. yes.
And, if that isn't enough to chew on, I am swapping out motors from my chevy 350, to a 5.3LS. So, that is going to probably be some more fab work in itself.
Any ideas? My brain hurts, and my wallet is about to hurt too, I think.