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How hard to replace front diff on 1998 full size blazer?

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2009-05-12 08:54:51
2009-05-12 08:54:51

very very hard

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No it will not, It is all different. Actually yes it will i have to correct you om that i have a 96 blazer same front diff as an s10 and 96 to 03 are the same i just put a 2000 front diff in mine

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You have to remove the diff cover, then replace with new gasket and refill thru plug.

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depends upon the truck, diffrent ratio's were used

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Under the front of the truck on the diff. or hog head,This is where the actuator is located it has two wires on it and screws into the diff. or hog head,You will need to unplug the wire connector and then unscrew the actuator and replace it.

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The vacuum actuator is either in the fender or under the battery. The actually diff actuator is on the back/bottom of the front diff. Mine (2000 blazer) is under the battery. It sucks to get to. If you check the actuator and it doesn't move at all, check the vacuum, if it's not getting vacuum, check the switch on the top driver's side of the transfer case. It sends vacuum to the actuator. It has three vacuum hoses coming off of it. It costs fifteen dollars at autozone and usually greatly improves the performance of the acuator.

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Yes, undo the front one the the LHS then the RHS if neccisary. Broken mounts are normally caused by locked viscous diff.

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Raise and support front of vehicle with proper jacks. Unbolt front of driveshaft from diff. Unbolt both axles from differential flanges. Disconnect wiring shift cable and vent hose. Support differential with floor jack. Remove bolts holding diff to the frame. Lower diff on jack. You may need to turn the steering one way or the other for clearance.

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the front diff is part of the gearbox and the diff/gearbox oil is the same-there is a dipstick on the offside of the box near the bellhousing.

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Unbolt the differential cover while the diff sits over a drain pan, let it drain, scrape off the gasket, ensure the mating area is clean, replace the gasket and secure it with some RTV, replace the cover... there might be a specific torque spec set by the OEM, but I've always just done "tight is tight" without a problem on my Blazer, remove the fill plug on the side of the diff, add the recommended amount of 75W-90 gear oil (the amount, I don't remember offhand), replace the fill plug.

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A truck is normally driven from the front.

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sounds like you have over filled the diff with lubricant drain lubricant and replace with proper rated oil and proper amount

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i have a 95 blazer also. jack it up, disconnect the drive shaft, take off the shocks, cut the u-bolts. they r probally to rusty to unbolt. let the diff. drop. take off the diff cover, take the diff apart, and pull it out. install opposite of removal. its really not that hard.

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Dana 44 front diff and 9.25 rear diff

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Should have some kind of a synchronized solenoid to engage the front diff. go to a parts store to look at a wiring diagram to trace it down or stop in and ask about it at a dealer. they will usually help if they are not too busy. The above isn't entirely true. on a 1986 S-10 Blazer the front hubs are actuated via a vacuum system. Under the hood of the s-10 will be a black plastic ball. (A little bit bigger than a softball.) There should be a single vacuum line hooked to it. This is what causes the front hubs to lock.

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The drive axels can be removed & replaced individually. If you've actually broken the front differential housing you will need to get the gear ratio and find out what kind of diff you have in the truck and make a trip to the wrecking yard and get a used one and replace the diff. as a complete unit.

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The right seal can be replaced by only removing the right shaft. To replace the left seal, the entire axle needs disassembled.

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You will probably have to remove the axle assembly and replace the retaining ring on the end of the axle that slips into the diff. More than likely the ring got bent or out of place and it is not allowing you to snap the axle back in.

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I just had this repaired on my 93 Blazer yesterday, underneath the battery box there is a vacuum actuater that has probably ruptured and needs to be replaced. It looked like an easy job and only took the shop 1/2 hour start to finish.

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Garbage trannies and front diff actuator

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It is located in the front of the diff on the driver's side. There is no drain plug on the diff cover so one has to either sifen the fluid out or remove the cover to replace the oil. The plug requires a 3/8" square socket extention to remove.

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The front axle seals go bad. There is special "Dealer only" blue transfercase fluid and it is way overpriced at $14 a quart. Anyway, buy that first and get new seals then you'll need to drain diff and replace the seals, then reassemble the axle shafts into the diff and then fill with dealer only xfercase fluid.

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diff sizes for front and rear.

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You could remove the transfer case, front driveshaft, front diff and front axleshafts. Then you'll most likely have to swap the transmission for a 2 wheel drive version and find a 2 wheel drive rear driveshaft. You would basically need a 2 wheel drive Blazer with all its running gear in good shape so you could swap all the parts over. If you're not emotionally attached to your current 4wd Blazer, I recommend just selling it and finding a fitting 2wd replacement rig.

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If I remember correctly the 80/90 is recommended for the front diff only and the rear takes a 140 weight. The front diff is free rolling most of the time and doesn't work as hard or brake down and heat the fluid like the rear does. I'd certainly not recommend putting that light oil in the rear diff.

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if you own this vehicle and do not know how the front wheel assebleys are lubricated then you should not own it... its lubricated by grease.. the front ifs had no sealed connection to the front diff thus it cannot be fed oil front the diff.


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