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Jeep AX-15& NV3550TransmissionNP231Transfer CaseFluid ChangeMaintenance Service


Changingyour Jeep"s transmission and also transfer instance fluid must be excellent as component of yourroutine 30,000 mile tune-up service and/or ~ doing a deep water crossing.This write-up consists what you will certainly need and how to carry out this an extremely easymaintenance organization on one AX-15 or NV3550 transmission and also an NP231 TransferCase. All three are commonly found in a Jeep TJ Wrangler, YJ Wrangler and XJCherokee.

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AX-15 infection Service

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1.Makesure friend have whatever you need before you get started. There"s naught worsethan draining her transmission just to uncover that you need to make a operation to theparts store. On an AX-15, you will require 4 quarts of transmission fluid, aratchet, 19mm socket, one oil catch pan and a party pump.

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2.Park top top level ground and also place one oil record panunderneath her transmission. Using a 24mm socket, eliminate the AX-15transmission fill bolt i beg your pardon is situated on the driver next of your Jeep.

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3.Locatedon the passenger side of your Jeep, remove the AX-15 transmission drainpipe boltusing a 24mm socket and also do so slowly so you carry out not to drop the in the oil catchpan.

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4.Thetransmission will drain quickly and also forcefully so make sure you space out the theway and also that the pan is in place to catch the fluid.

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5.Thedrain bolt the the AX-15 transmission is magnetized to collect bits of metal.Inspect this for unusually big bits of metal, clean it and also then reinstall it.Tighten bolt to 14-20 ft. Lbs. The torque.

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6.Open up a bottle of infection fluid, affix yourbottle pump come it, insert the hose right into the to fill hole and start pumping away.Keep pumping in fluid until it begins to ooze the end the fill hole and then reinstallthe to fill bolt. Tighten this bolt come 14-20 ft. Lbs. The torque.


NV3550 infection Service

1. Park on level ground and place an oil catchpan underneath your transmission.If you have an oil pan skid plate favor me, you will firstneed to completely remove it prior to you have the right to continue.

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2.Place one oil capture pan underneath her transmission.Using a 17mm Allen Bit, remove your NV3550 transmission fill bolt which islocated top top the driver side of her Jeep. Then, slowly remove the drain boltusing the very same 17mm bit so you carry out not come drop that in the oil capture pan. Thetransmission will drainpipe quickly and forcefully make sure you room out from underit.

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3.The inside end of your drain bolt has a tiny magnetictip which is provided to collection fine steel filings. Clean turn off this magnet and also takesome time to check the piece carefully. Good particles will certainly stand up likehair and this is normal, large chunks space NOT.

4.Once drained, re-install your drainpipe bolt making certain totorque the to factory specifications. Mine 2000 FSM has 14-20 ft. Lbs. Indicatedas the proper torque setting.

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5.Now the time come refill her NV3550 Transmission. Open upyour bottle of Mopar infection Fluid, connect your party pump come it, insertthe hose right into the to fill hole on her transmission and also start pumping. Friend willneed about 2 party to fill it up and keep pumping it in until it start toooze out of the fill hole. Be certain to perform this top top level ground or else you maynot placed in the ideal amount.

6.Keep pour it until it is full the transmission until liquid starts to oozeout, re-install the to fill bolt and be certain to talk it down to 14-20 ft. Lbs.like the drain bolt.


NP231 Transfer case Service

On a TJ,there is a proper way to service your NP231 carry case and a lazy way. ~ above anXJ, you do not must worry around this as there is no transfer situation skid platein your means to transaction with.The proper way(lazy way follows this):

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This is what your NP231 Transfer situation looks like(shown on a TJ) indigenous under the ago of your Jeep. I have indicated wherein thefill and drain bolts are situated in the pic to the left. Please note that someNP231"s have different types of bolts offered here.

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1. top top a TJ, friend will have to remove the transfer instance skidplate to organization the NP231 deliver Case. To carry out this, eliminate the 4 nutssecuring your transmission mount come the transfer instance skid plate using a1/2" socket.

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2.Placea jack was standing underneath the bell real estate of her transmission. Then, using afloor jack with a item of 2x4 on height of it to help distribute the load, liftthe facility of your transfer situation skid plate up till it place a tiny pressureon it.

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3.Removethe 6 bolts securing her transfer case skid key to her Jeep"s frame rails.On a 1997-2002 Jeep TJ, friend will need a 3/4" socket. 2003+ TJ"s use ametric bolt the is similar in size but I perform not understand what that is. A breaker barwill come in handy here and also if girlfriend live in the rust belt of America, some PBBlaster top top the bolts will assist out a lot.

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4.Withthe bolts removed, gradually lower her floor jack just a little and do surethat your infection bell housing is currently resting on peak of the jack stand. Then,grab the lip of the transfer instance skid plate and roll the whole thing out fromunder your Jeep. Set your skid plate aside because that now.

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5.AsI pointed out before, I have seen the NP231 Transfer situation come through 2 differenttypes that fill and drain plugs. One requires a 30mm socket to remove and also theother offers a 10mm Allen bit. Identify which you will certainly need and also remove the fillbolt.

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6.Placean oil catch pan under your transfer case and then remove the lower drain boltagain utilizing the same 30mm socket or 10mm Allen bit that you provided for the fillbolt.

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7.Allowyour NP231 Transfer situation to drain totally before proceeding.

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8.Oncedrained, re-install the drainpipe plug and tighten it come 15-25 ft. Lbs. Of torque.

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9.Usinga yorker spout top top the bottle or a bottle pump toassist you, to fill up her transfer case with ATF+3 till it begins to ooze outof the to fill hole and then re-install the to fill bolt making certain to tighten itdown come 15-25 ft. Lbs. That torque. (Photo as shown on one XJ)

10.Putyour transfer instance skid plate earlier on optimal of her floor jack and stabilize itby holding it through one hand. Role it underneath her Jeep and also jack it up intoplace.9.Re-install the 6 bolts that host theskid come the framework just finger tight so the it have the right to still move approximately a bit.Now, re-install the infection mount nuts. Together mentioned, you may need toshift her skid plate roughly in bespeak to heat up the holes. The transmissionmount nuts will should be tightened to 40-45 ft. Lbs. Of torque.10.Secure the 6 skid plate bolts tofactory bolt to 44-55 ft. Lbs. That torque. Eliminate your jacks, clean up yourmess, re-install her oil pan skid plate and also you have to be done.

The lazy way:Just therefore you every know, the very first time Iserviced mine Jeep TJ"s NP231 carry case, i did the the proper means as explainedabove. However, the second time around, ns was pressed because that daylight and also time andcame up with this method.

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Anyway, every you have to do is skip every thesteps involving the removal and installation of her skid plate and also just drainyour transfer situation directly into it.

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Fortunately, the skid plate has actually a recessedsection directly underneath it with (4) drainpipe hole in it. Ns just inserted an oilpan directly under this holes to collection the fluid and also then wiped under theskid plate v some rags as soon as finished. Take away a fraction of the time to do.

When finished, you re welcome take her usedtransmission and ATF liquid to your local auto parts store to have it disposedof properly.