/wwwthreads_images/icons/smile.gif A few years ago when we went looking for a base platform on which to build the ultimate SNOJEEP, we basically had two choices: A new/wwwthreads_images/icons/shocked.gif TJ and swap in the NV242 transfer case, or we could go way back to a '76-'79 CJ-7 with the Quadra-Trac system./wwwthreads_images/icons/smile.gif For snow driving; especially up here in the steep country; you want all wheels driving equally, and all wheels slowing equally on decelleration;/wwwthreads_images/icons/tongue.gif AND.....and this is the biggie......each wheel needs to go a different speed if needed. So that means an open-center differential in the transfer case, like our ZJ with the NV242 has. The big drawback to QTs is the cone clutch setup. Because of those cones, the QT's are stubborn about going into lockup when you need it; and because of the cones, tire size and tire matching is critical; and because of those cones, you must use a special fluid. So........we disabled the cones in a simple machining operation, and the result was a transfer case which works WITH YOU, not AGAINST YOU. We also moved the vacuum switch to a convenient place on the dash; instead of having it buried in the back of the glove box; and we devised a tricky indicator lamp system which shows Jeepchick which mode the case is in. Green=Open, Yellow=In the process of shifting, Red=Locked. Jeepchick can flip the vacuum switch and do lazy figure eights until the yellow lamp goes out and red appears. A great many......like almost all of them... QTs that I have inspected show the effects of incomplete shifting. The collar never made it all the way to lockup, and then the case will POP out of lock when power is heavily applied, and the cussing begins. Keeping the chain fresh seems to be an important theme to prevent the destruction of the case from a broken chain wadding up under the driven sprocket and grenading the case. THE TRUTH IS......a QT has the highest shaft-to-shaft efficiency of all the early cases if you are in direct drive. HOWEVER, the cones and the tire mismatch that is usually present on QT Jeeps shoots down any previously gained efficiency. People often mistake the low efficiency of the TH400 tranny for what they think is QT-caused low efficiency./wwwthreads_images/icons/frown.gif The truth is, that together, the TH400/QT combination DOES suck up fuel, but it doesn't have to be that way, if you disable those cones. Our SNOJEEP doesn't have the low range, simply because we didn't happen to need one. The TH400 is beefy enough to pull at low enough speeds for snow work, and we really don't do any rock climbing./wwwthreads_images/icons/smile.gif The low range units just add to the slack in the drive system so since we really didn't need one, we didn't install one./wwwthreads_images/icons/smile.gif My crack moonguy Quadra-Trac team is on standby,/wwwthreads_images/icons/wink.gif and ready to leave at a moments notice. They can modify your case in the supermarket parking lot while you go in for a suitcase of Bud light./wwwthreads_images/icons/crazy.gif/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/laugh.gif/wwwthreads_images/icons/cool.gif
CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
