how should i go about changing the diff fluid in my 1990 f250 4x4. the rear diff seems easy enough to pull off the plate and let it drain. but the front with the i beam setup seems like a pain in the ***. my auto tech teacher told me just to suck it out with a turkey baster or something. any recomendations?

 

Sucking it out of the diff is the easiest way.

 

Is the diff a dana 44 or a dana 50. My 91 axle is a dana 50 and it has a square plug on the center section itself.

 

not sure its a 410 tho and it has the square plug but its for filling i thought

 

You can suck it out, but a turkey baster won't work. You need something with a hose that will reach all the way to the bottom of the diff. I used to use a suction gun when I had TTB trucks. Looks like a grease gun but it's more like a huge syringe. Just pull back the plunger to suck the oil out.

 

That's what I did. I was dumbfounded when I pulled the fill plug and oil started coming out, but when I started sucking out the fluid I found that it was full of water.

 

ok thanks for the advice im sure i can rig something up. and yea i bet theres water in mine considering ive driven through lots of puddles and creeks without changing it

 

Consider installing a plug at the bottom. It's not that difficult.

 

^^^
If you're talented in the word of drilling and tapping your own holes.

 

Just don't drill the hole O.D. to close to the tap size O.D. Plug will strip out easier.