Information requested, no problem

go on line to jeep wrangler fluid capacities and specs and down load the information.

Try these web sites:

http://www.rockauto.com/catalog/raframecatalog.php?make=gmc&year=1996&a=search.aol.com%2BSearch%2Bfor%2B1996%2Bgmc&ck[ID]=0&ck[idlist]=0&ck[viewcurrency]=USD&ck[PHP_SESSION_ID]=g2ngderrdpccbuacidj42tflc1

http://www.automotix.net/partshotline-gmc-sonoma_pickup-requests.html

http://www.theautochannel.com/autoparts/salvageyardspartsgmc/sonoma_pickupitems.html

the dealer is correct....you need a front differential.you are correct i have seen this happen on several and think nissan should address it but to my knowledge they have not.ask your dealer to put in a goodwill request with nissan.since its aproblem that they are aware of they may authorize it.if not call 1800nissan1 and raise hell .good luck.let me know how it turns out.

Technically you do not have 4 wheel drive, you have two wheel drive (possibly three-wheel drive). When you engage 4WD you direct power to the front and rear differentials. The front differential is an open style which means that only one wheel will drive, and the rear differential is likely the same type which means that you will only have two wheels driving the vehicle (one front, one rear). If the rear differential is a "posi-trac" or "limited-slip", then both axles should lock and drive the vehicle (hence, three-wheel drive), but this style differential is not as common as it once was.

Front differential is: 75W-90

Rear Differential is a little different...what type of differential...limited slip or standard differential? Dana 135?


Axles subject to frequent trailer towing in hot or
hilly conditions may use Synthetic 75W-140 GL-5

Depends on what model and components you have:

{ ...
ENGINE TORQUE DISTRIBUTION – DIRECTING THE FLOW OF POWER
In an all-wheel-drive vehicle, engine power can be directed to all four wheels. Subaru Symmetrical AWD differs slightly from model to model in how it directs power to the wheels, depending on its transmission.

MODELS WITH FIVE-SPEED MANUAL TRANSMISSION – CONTINUOUS ALL-WHEEL DRIVE: A viscous-type locking center differential and limited-slip rear differential help distribute torque – normally configured at a 50/50 split front to rear. If wheel speed differs between front and rear axles, the center and/or rear differentials lock up to help distribute power to the wheels with the most traction.

MODELS WITH FOUR-SPEED AUTOMATIC TRANSMISSIONS – ACTIVE ALL-WHEEL DRIVE: An electronically controlled variable transfer clutch and limited-slip rear differential distribute power to where traction is needed. Sensors monitor parameters such as wheel slippage, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction.

MODELS WITH FIVE-SPEED AUTOMATIC TRANSMISSION – VARIABLE TORQUE DISTRIBUTION ALL-WHEEL DRIVE: As with Active All-Wheel Drive, an electronically controlled variable transfer clutch distributes power, but through a planetary-type center differential and a viscous-type limited-slip rear differential. Torque distribution is normally configured at a performance-oriented rear-wheel-biased 45/55 split front to rear. Sensors monitor the same parameters as for Active All-Wheel Drive.

WRX STI, WITH SIX-SPEED MANUAL TRANSMISSION – DRIVER CONTROLLED CENTER DIFFERENTIAL (DCCD) ALL-WHEEL DRIVE: The STI uses an electronically managed multi-plate transfer clutch and a mechanical limited-slip differential in conjunction with a planetary-gear-type center differential to control power distribution between the front and rear wheels. Featuring manual and three automatic modes, DCCD is normally configured at a 41/59 split front to rear. Sensors monitor parameters such as wheel slippage, steering angle, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction. DCCD also features a limited-slip helical front and Torsen® rear differential. ... }

And what are the symptoms? How do you know the coupling to the rear is not working?

2000 GMC TRUCKS SSERIES JIMMY 4.3L 6-cyl Engine Code [W]
Differential, Front......GL-5 All TEMPS......80W-90 Manufacturer recommends GM part no. 1052271 or equivalent Do not add limited slip additive.
Differential, With 7.25 RingGear Front..........1.2 liters
Differential, With 8.25 RingGear Front..........2 liters
Differential, With 9.25 RingGear Front..........2.8 liters

This information is from my genuine service manual. I hope it is of help.
Non-turbo
Turbo
Sedan Wagon
Type 5-forward speeds with synchromesh and 1-reverse
Transmission gear ratio
1st 3.454 3.454
2nd 2.062 1.947
3rd 1.448 1.366
4th 1.088 0.972
5th 0.780 0.738
Reverse 3.333
Front reduction gear Final
Type of gear Hypoid
Gear ratio 4.111 3.900
Rear reduction gear
Transfer
Type of gear Helical
Gear ratio 1.000 1.100
Final
Type of gear Hypoid
Gear ratio 4.111 3.900 3.545
Front differential Type and number of gear Straight bevel gear (Bevel pinion: 2, Bevel gear: 2)
Center differential Type and number of gear
Straight bevel gear
(Bevel pinion: 2, Bevel gear: 2 and viscous coupling)
Transmission gear oil GL-5
Transmission gear oil capacity 3.5 2 (3.7 US qt, 3.1 Imp qt)

Standard Differential, Rear W/ SGRX......GL-5 ALL TEMPS......80W-90
Standard Differential, Front......GL-5 ALL TEMPS......80W-90
CAPACITIES: Differential, Front..........1.5 liters Differential, With SGRX Rear..........1.9 liters Saginaw rear axle has a removable rear cover without fillplug. Differential, Without SGRX Rear..........1.8 liters

ya...
1 more way is ther but takes time ,quit more.

try to weld front differential where oil is gonna leak & but do this when your all oil is out of differential case than it will happen baater so,

another way is 1 solution which is highly recommanded for this type of crack in differentials,which still i cant get that name but at branded service center they will do for your differentials case.

THNX