And finally we come to one of the centerpieces in this build - the transfer case. There have been several good threads in the past about what is the ideal combination for a TJ and several people have expressed opinions on what works best and what doesn't. These discussions have often polarizing posts about what works best with a manual vs an auto trans, benefits of the rubicrawler and the pitfalls, heavy debates on crawl rations and all that fun stuff.
One of the things that I realized on the black jeep was that I often felt that 4:1 was too low sometimes for what i was doing. It should not be a surprise when I say that I could just live with a NP231 and it's 2.72:1 and be entirely happy with it for 99% of my needs. But sometimes the heart desires more and given the premise of this build, I decided to do something that has been discussed quite a few times but never really done given the costs.
This jeep is getting a 2spd Atlas (2.0:1 ratio) along with a Rubicrawler (2.72:1 planetary). Functionally it is equivalent to a 4spd Atlas, but disaggregated and not in the same "package" as you get with a 4spd Atlas. The main benefit of this setup is that you get 4
very functional ratios - namely 1:1, 2:1, 2.72:1 and 5.44:1. IMO, that is an ideal spread for a TJ. In the black jeep, I put the vehicle in low-low (4-low + rubicrawler low) ONE TIME and I realized why it was a dumb idea .. even standing on the brakes it was very hard to stop the vehicle. It's great for bragging rights but other than that is pretty much useless.
Q: Why do this way than a 4spd?
A1: I already had the Rubicrawler.
A2: This option also gives a little more rear driveshaft length which is always good.
Other than
@NashvilleTJ with his 4spd Altas, is there anyone on the board running this specific combination of ratios? If yes, please chime in if you have it and are reading this.
Here it in all it's glory. Blaine perfectly clocked the transfer case and did the needed clearance work on the tub. Note that it still took 6 attempts taking the case on and off checking for various things. This work looks easy but I will emphasize that a lot of care needs to be taken - From close experience I know the horrible mess that results when the tcase touches the tub and you really don't want that happening because the unpleasant nature of that sound and vibration will drive you mad.
After the height was finally set in the final position, Blaine designed the support crossmember and transmission mount adapters. That work has a large amount of detail and I will share it in a future post. For those that enjoy the technical details .. I promise that there is a big treat waiting !
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