Guest Ice Posted April 26, 2004 Share Posted April 26, 2004 Hey all... I had the clutches and gears changed in my tranny 2 weeks ago. The mech. assured me everything was fine, but sunday morning while driving, the tranny geared down to 2nd gear as soon as I reached 120km/h... I managed to drive home stuck on 2nd gear and later when I started again, it worked a bit better, but I'm only getting 1st, 2nd and 3rd.... no 4th and no reverse... does anyone know if this is a mechanical or electrical prob ? And should I do any more repairs or change it entirely ? Also, I'm in Trinidad and am having difficulty finding another tranny.... Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 26, 2004 Share Posted April 26, 2004 Sounds like it went into "limp mode". When you shut off the ignition and turn it back on again, it will reset the tranny computer and should work properly again. The Nissan auto transmission is entirely controlled by the tranny computer. From the sounds of it, someone at the mechanic's shop did something wrong. If they simply reused the stock tranny cooler, it may be clogged. That's a very common problem with Pathfinders. It's easily fixed by using an aftermarket external transmission fluid cooler and completely bypassing the stock cooler inside the radiator. By the way, it's not "4th gear" on an auto...it's simply overdrive. The torque convertor locks up to provide direct drive at higher speeds. Link to comment Share on other sites More sharing options...
squam1 Posted April 26, 2004 Share Posted April 26, 2004 88 you're right about 4th being overdrive in an auto - but the Nissan automatic IS a 4 speed - it just happens to have an over drive ratio for the 4th gear (unlike bmw 5 spds that have a 1:1 final drive ratio that ISN'T overdrive)... it also is a lock-up not to be a pain in the behind, but felt like clarifying... Link to comment Share on other sites More sharing options...
Diesel Boy Posted April 26, 2004 Share Posted April 26, 2004 Very interesting!!!! So there goes who evers theory that disconnecting the lock up would over heat the trans!!! Not likely!! Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 26, 2004 Share Posted April 26, 2004 I dunno about that. There are three distinctly different forward gears, then it simply locks the TC for OD. AFAIK, there is no "fourth gear" to shift into. Unless I'm completely wrong, but I don't think I am. Link to comment Share on other sites More sharing options...
sw Posted April 27, 2004 Share Posted April 27, 2004 I had the clutches and gears changed in my tranny autos dont have clutches' anyways sounds like the shop you took it to did something wrong, take it back to them and make them fix it at there expense btw: no reverse is a good sign of a worn auto tranny Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 27, 2004 Share Posted April 27, 2004 Do too. The clutches(multiple) in an auto go inside the sprag/drum assembly and have steel friction discs inbetween them. There are anywhere from 4 to 6 clutch discs inside an auto, depending on manufacturer, construction and application. http://auto.howstuffworks.com/automatic-transmission11.htm Link to comment Share on other sites More sharing options...
sw Posted April 27, 2004 Share Posted April 27, 2004 doh ill get back in my box now Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 27, 2004 Share Posted April 27, 2004 *petpet* It's OK, no worries. Link to comment Share on other sites More sharing options...
Guest Ice Posted April 27, 2004 Share Posted April 27, 2004 Hey guys... thanks a lot for all the response... I already have an external cooler... the van came with it. I spoke to the mech. and he said he eventually did get reverse, but only for a moment. I'm wondering if it could be an electrical problem, since basically everything mechanical was already changed... :confused: Link to comment Share on other sites More sharing options...
denisb Posted April 27, 2004 Share Posted April 27, 2004 I'm sure this is probably not it, but since I don't know how competent your mechanic is, I'm going to put my neck out on the chopping block and ask if the cable was adjusted on the shifter. Sometimes the more bvious problems are the hardest to find. Link to comment Share on other sites More sharing options...
Guest Ice Posted April 27, 2004 Share Posted April 27, 2004 Good question denisb... I would like to think that he did. But one can never be sure unless it's done by oneself... Although he did assure me that everything checked out fine.... Link to comment Share on other sites More sharing options...
somethingcool Posted April 27, 2004 Share Posted April 27, 2004 Very interesting!!!!So there goes who evers theory that disconnecting the lock up would over heat the trans!!! Not likely!! Ok, I'll say it again, pathy auto trannies are not designed to run unlocked for a long perioid of time. Anytime the torque convertor is not locked up it will be slipping and therefore generating heat from fluid friction. I never said it will destroy your tranny, but it will generate extra heat and wear (especially on your ATF), and I would guess if you are running it hard offroad you would have a much greater chance of overheating your tranny... If you don't believe me, see here: http://65.166.200.170/ubbthreads/showflat....true#Post315854 and here: http://65.166.200.170/ubbthreads/showflat....true#Post256855 and here: http://65.166.200.170/ubbthreads/showflat....true#Post312257 Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 28, 2004 Share Posted April 28, 2004 Ew, AC BBS posts. hehehehe Link to comment Share on other sites More sharing options...
NissanPerson Posted April 28, 2004 Share Posted April 28, 2004 I figured it was temp sensitive since every Pathfinder I've driven doesn't shift into lock-up when it's -30 unless you've driven around A LOT. When I first got my car I counted 5 gear changes...one from about 0-15, one from 15-25, one from 25-35, one from 35-45 and then really low one (I'm guessing lock up) from 45+. I always was interested in why the 4spd seemed like a 5spd. Anyway, I don't know anything about these trannies except I have noticed they tend to overheat A LOT when driving down newly graveled roads and into a wind. Too much resistance I guess. And, they also seem to lose reverse at about 125k or so. At least the 3 my parents and I have owned and the numerous ones people we know have owned. But I bet 88offroad doesn't have to worry about lock up since I think he's the one with the picture with his reverse lights on. Hey, at least I think I'm funny. Link to comment Share on other sites More sharing options...
Guest Ice Posted April 28, 2004 Share Posted April 28, 2004 Well guys... I bought another tranny today... it's in the shop now, so I hope this solves my problems. Again, thanks for all the views and comments... will keep you all posted of the outcome and hopeful progress... Guess no more turtle watching for a while... Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now