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Got a leak from the rear differential on my truck, where the drive shaft goes in what made it leak

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  • Chevrolet Master
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Its called the rear pinion seal The oil in the rear differential has 80-90 weight oil and tends to expand a lot when it gets hot There is a vent hose that comes off it that lets the exaess pressuue escape check to see if the hose it clean and never over fill the unit There is a drain plug on the bottem of it and one midway up on it thats the filler plug when the oil starts to come out of the filler plug its full But check the vent hose clear it if need be and the leak will probably stop on its owen

Posted on Nov 11, 2010

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  • Master
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Hello Barry.
There is a flange attached to the pinion shaft that drives the gears inside the differential.
This flange is held to the shaft by a large nut threaded onto the pinion shaft.
On the flange there is a machined surface the seal rides on to retain oil inside the differential.
Sometimes rust can develop on this surface and tear the seal. Also debris could damage it as well.
Or in a worst case scenario the bearing that the pinion shaft turns on goes bad and allows the flange to wobble.
It will take an experienced mechanic a little over an hour to replace the seal.
The large nut on the pinion flange needs to be properly torqued and takes a proper torque wrench to do it.

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KL

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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SOURCE: rear differential leaking on ford f-350 super duty

if you have never done one its best to take to dealer because you have to remove drive shaft and then rear pinion nut and remove seal the tricky part is you have to buy new crush sleeve and thats what sets your pinon depth so that pinion rides in middle of ring gear its called setting your pinion depth if over tighten will hurt bearings and or ring gear and if under tighten will be verry noisey and cause ring and pinion failure best to let someone with special tools and knows what thier doing i use to do all chevy diff at my old dealer your use inch torque wrench to measure the drag on pinion nut and then use 1/2 inch impack to tighten the nut people freak because impack is rated at 600 ft pds but your using inch torque wrench to check drag not how tight nut is good luck

Posted on Aug 23, 2012

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Good Luck!! Don't forget to rate this post!!
SLIP YOKE DRIVE SHAFT 7e10b35.gif
SLIP YOKE TWO-PIECE DRIVE SHAFT 7dbeb20.gif
FIXED YOKE TWO-PIECE DRIVE SHAFT c9f7f4c.gif

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