I just drained and replaced the gear oil in the front differential this weekend and I put in a full quart and a few ounces more. Should I try to siphon some out to get it to the 1/2" below plug level, or will it be okay to leave it as is?
Any harm if differentials are overfilled a little?
- Thread starter 400Magnum
- Start date
ScarabEpic22
Member
- Nov 20, 2011
- 728
silvernclean said:
Thats how you're supposed to do the front according to GM's own TechLine, and Ive done it the same way to the rear in my 02 two or three times now. Going to do the SS in the next few weeks for the first time, just rolled 32,3xx when I got home from my 1,200mi weekend trip (since Thurs actually)!
I had minor headaches getting the front plugs out, they were tight, but eventually came out. The transfer case was another story, they were in there TIGHT and did not want to budge, plus, they take a very large Allen wrench instead of something normal like a regular 3/8" rachet, or at least mine were Allen head. And there's no way they were coming loose just by using the Allen wrench, I had to get a short piece of copper pipe on the Allen wrench to break them loose.
After reading this thread, I'm even more fearful of the rear differential... http://gmtnation.com/f79/trailblazer-throttle-body-rear-diff-drain-fill-without-drain-plug-pics-1179/
There's some good tips in this thread on things that might help. As for myself, I'm going to spray the rear differential fill plug with penetrating fluid a few times before I try to break it loose.
After reading this thread, I'm even more fearful of the rear differential... http://gmtnation.com/f79/trailblazer-throttle-body-rear-diff-drain-fill-without-drain-plug-pics-1179/
There's some good tips in this thread on things that might help. As for myself, I'm going to spray the rear differential fill plug with penetrating fluid a few times before I try to break it loose.
seanpooh
Member
- Jan 24, 2012
- 461
In the front differential, the fill plug is 18mm and the drain plug is 13mm. I used a impact wrench to remove the fill plug with an extension bar.
The rear end isn't hard, an actual 3/8" socket wrench with no socket fits into both the drain and fill plugs. I used a torque wrench with a size reducer to remove them.
Make sure to get a flat head and scrape out the gunk inside the plugs so the wrench doesn't slip.
As for your actual question, there is enough room inside the differentials for aeration. Overfilling not a problem.
The rear end isn't hard, an actual 3/8" socket wrench with no socket fits into both the drain and fill plugs. I used a torque wrench with a size reducer to remove them.
Make sure to get a flat head and scrape out the gunk inside the plugs so the wrench doesn't slip.
As for your actual question, there is enough room inside the differentials for aeration. Overfilling not a problem.
Wooluf1952
Member