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post #1 of (permalink) Old 04-24-2001, 07:26 AM
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Diffs

How often do we need to change out axel fluids? Also how often do we need to change our Transfer case fluid? Thanks for any input on this subject.

1995,4X4,4.3L/TBI,3"Body Lift,Flares,31's,Nerf Bars, K&N,TB/Shackel Lift,Grill/Brush Guard,Double Rear Bar.

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post #2 of (permalink) Old 04-24-2001, 05:20 PM
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Re: Diffs

i change ALL my fluids after every wheelin' trip. If i don't go wheelin for a month i change it the first day of the month. I do this to reduce the risk of getting water into very pricy parts that could cause them to break. Thats just the way i do it. Other may do it different. And don't forget the GM posi fluid if you have it. Hope that helps.

MudderS10s
91 S-10 4.3L, 5 speed, 3 inch bodylift, 32" super swapper TSLs, 2 inch rear shackle lift
73 CJ-5 mods- way too many to list
91 Yamaha Banshee
00 Kawasaki ZX-12
post #3 of (permalink) Old 04-24-2001, 07:00 PM
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Re: Diffs

Changing the transfer case and the rear differential is no problems but how do the rest of you change your front differentials ? I know my S-10 doesnt have a drain plug and I sure dont want to pull the differential to do this. I could drill and tap in a plug but I figure with my luck I would drill into a gear or bearing [img]/wwwthreads_images/icons/frown.gif[/img] If I ever have the front differential out I will drill and install a plug then. The books said to use an oil suction gun but that didnt work at all. I couldnt even get out enough that I needed to add any back when I finally gave up [img]/wwwthreads_images/icons/laugh.gif[/img].

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post #4 of (permalink) Old 04-24-2001, 10:46 PM
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Re: Diffs

I used a suction gun on mine with no trouble. BTW it helps if you warm the 90W up first. You don't get all of it out, but enough to get most of the contaminants out.
A.Smith

1989 GMC S-15 4x4 4.3L/700R-4, 3.08s, 31" Sport Kings For Sale
1985 S-10 4x4 Soon to have 3504BM/TH350/D44/14FF, 35" Boggers
post #5 of (permalink) Old 04-25-2001, 12:24 AM
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Re: Diffs

This was a way that was sugested to me on changing the front diff fluid some time ago.
Go to the store and buy yourself:
One hand vacuum pump with guage (these things come in handy more than you'd expect)
One brake bleeder cup to go with said vacuum pump.
This combination works great. Hook the vacuum pump up to the fitting on the bleeder cup (usually on the cap that screws on) that does not extend into the bleeder cup. Hook a line to the other fitting and put that into the fill plug hole (on mine the fill plug hole is on the passenger side near the front of the differential (on the diffy obviously)). Then just pump the vacuum pump and watch as the bleeder cup fills up. Empty the bleeder thing when it gets near the vacuum port that the vacuum pump is connected to (we don't want gear lube in our new vacuum pump). This seems to be the best way I've found to do it.


1995,4X4,4.3L/TBI,3"Body Lift,Flares,31's,Nerf Bars, K&N,TB/Shackel Lift,Grill/Brush Guard,Double Rear Bar.

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