From $200 to $400 difference in price between 3.8 and 4.3. Usually $1,800 and change for the 3.8 up to $2,400 and change for the 4.3. This is complete. Shifters and all. Would suggest the sight glass option so that you can tell how much oil is in the unit.
I have the 4.3. It is my second one. The first was one of the first 4.3's that AA made, and there were some problems with both it and the service. All has been worked out and am now very pleased with it. See details on my web site if you like.
It does pop out of gear from time to time. Has to do with one of the shift levers hitting against something I think, or may be an adjustment on the lever connections. One of these days I will check it out. I do know that AA had a new shift lever set up on the second unit I got. I replaced the original levers on the second unit simply because I had bent the shift levers to suit my own taste. May be that the jumping out of gear problem is connected with the older style shifter setup. All these fittings are external, BTW. Nothing inside the unit has been modified.
On the trail the Atlas is a real pleasure to use. I normally run 2 WD LOW and only shift into 4 WD when necessary. With the Detroit in the rear axle and the slow speed afforded by the gearing (75:1 crawl ratio) I can do lots of stuff in 2 WD. Shift into 4 WD, then hit the button for the front ARB for the most difficult of conditions. Lots of versatility. Only slightly annoying situation is that I have to shift into 2 WD HIGH from time to time to keep up with the group when we actually get onto a "semi road" type trail. 18 mph in low overdrive is about the top speed for the low side of the transfer case, and that is some fairly high rpms, but it shifts from 2 WD LOW into 2 WD HIGH while it is rolling. Going back into LOW range is best done at much slower speeds - 5 mph or under.
Lastly, look inside one of those Atlas cases. Looks like a Mack truck. Big gears, strong case, heavy duty!!! Really is impressive.
Doug '97 TJ
My Web Site