Well the NWF ECO box has popped out of gear 5 times, twice a couple of weeks ago, once yesterday and twice today and the last time it locked me up and spun me around 180* this morning. Or I believe that's what locked up. I was able to drive it afterward to get to work as I was only 1/4 mile from work. What happens on the way home after work is up in the air.
So yesterday I called NWF and discussed the issue, and besides the you may have to adjust the cable better or you left out a thrust washer or snap ring or something is worn, the old oh yea heat can cause an issue because there's only 1 quart of fluid in the thing was brought to my attention and you can add a TILTON ENGINEERING pump 40-527 and a cooler to the system and you will never overheat the case and yea overheating it will cause it to pop out of gear. Oh and if it melts a piece of plastic in there it will lock up the gears!!! So here I sit a bit miffed on why does this shit happen to me and why do you never read about this stuff before you stuff it in your rig?!!!!!!
So to recap: the 1st two times it popped out of gear I had driven it about 20 miles and most of it at 55- 60mph plus maybe 2 more miles around the dirt offroad park and then 10 miles of driving on the way home again 55-60 mph and then another 4 miles at 65-70 mph when it popped out again before I got home. It popped out once yesterday after driving 5 miles(60 mph got 3 minutes and 45 mph the remainder) to an appointment, parked and it was about an hour before I jumped back in it and headed for the office and then after about 5 miles on the way back to the office it popped out again_65 mph for 5 minutes) and then I held the shifter to see if it would do it the remaining 4 miles to the office and it didn't pop out nor did it the 5 or so miles back home but I never got above 45mph. This morning 45 mph for 4 minutes, 65 for 4 minutes(popped out) and then another 45 for 2 minutes(popped out and locked up and spun me). One more minute no issue at 25 mph.
So it would seem or be extremely smart that if you want to use one of those reduction boxes(100% needed for the ECO box straight from NWF) and drive on the highway you need to add the Tipton pump and a cooler so that they don't overheat and cause issues.
Back story when I built my willys jeep in CA my new Advance Adapters 4 spd t-case locked up on me and sent me swerving, hopping and eventually rolled over down the freeway on the way back from the Rubicon. Now this was one of the 1st 4spd cases they built and they had an issue with overheating because the shaft in the reduction box would flex a bit and cause overheating and take out the bearing. They replaced the case at no cost to me, which was awesome, because it was 4-5 yrs old before I drove it on the street, due to me being in Kenya and build time, so it was way out of warranty. They redesigned the case by adding another bearing to solve the issue and I've never heard of anyone having an issue since then. Now again this was 10-12 years ago when I bought it and 7-8 years ago when it failed and they replaced it. And I think the redesign was sometime in that 10-11 years ago range.
So now I hope to make it home from work and then some thinking has to happen on my next move. Does the NWF ECO box need to be rebuilt after 500 miles on the road? Do I just add a cooler and hope the dang thing is ok? Do I shelve it all and go with a 4 spd atlas? Or do I buy the Behemoth range box and their NP 205 case? If I keep the NWF box(most likely) or get the Behemoth range box I will buy the Tipton Engineering pump and a cooler to add to the system. I guess I could just delete the range box also, but then I have to rework driveshafts, the belly pan maybe and my final drive ratio would suck or get another t-case with lower gears, but that would again mean reworking things.
Keep tuned for further adventures of what kind of shit can go south!!