rear diff fill plug very tight, too hard to get breaker bar in there

[apollo18]

so the fill plug on the rear diff is super tight. not sure how it got that tight but i believe there is a washer infront of the plug so that must be why it got extra tight. well there is a crossmember i think its called that is in the way and its tight up there so i cant get my breaker bar to help me loosen it. the diff bolt takes a 3/8 drive directly into it to loosen it

i have a impact electric wrench and i have a drill bit set that converts a drill bit to a 3/8 drive. 

my impact only pushes 900 inch lbs and it couldnt make it budge. there was enough space in there to get my impact in there so im glad for that

 

i also want to get upgrade my impact wrench with a newer electric one.

if i pickup one with 220-250 ft lbs of torque and i use my drill bit that converts the drill bit to 3/8 drive(see picture of it below)

would that be enough to get the fill plug off?

 

i was loosening it to the left as in counter clockwise but i think its prob a little over tight or stuck so hoping more torque from a new impact will be able to get it off?

 

or am i wrong

 

 

thanks

[davester]

Maybe?  We can't tell you how much torque will be needed to remove it.  But if there's enough room for an impact, I would say there's enough room for at least an extension into the plug, and to put a breaker bar on the extension...

[txab]

Soak it in Kroil, PB Blaster, etc. Can't hurt.

 

I'd use this on the impact. 1/2" to 3/8". I could see snapping your adapter

 

 

Edited July 21, 2020 by txab

[BlancoSilverado]

What vehicle so you have? 

Never heard a truck having a 3/8" square fill plug

[apollo18]

got it off! thanks guys!

my 900 inch pounds / 80 ft lb impact couldnt get it off so i bought a new one.

apparently has about 220 ft lbs of nut busting torque, its actually a impact driver so i can use it around the house, it has that 1/4 drill bit socket.

 

well i popped it on at speed 3 and after about 4 seconds it zipped off.

i was scared for the first 2 seconds as it didnt budge at all but then it was off!

must have been dirt or something

 

when i went to tighten it back up, i didnt torque it with a wrench, just got it to when the bolt stopped tightening and gave it a bit more.

[txab]

 I always put a little dab of anti-seize on the threads

[Black02Silverado]

3 hours ago, txab said:

 I always put a little dab of anti-seize on the threads

This is a good idea since this part doesn't get removed very often and subject to rode grime. 

 

Glad you got it off and did that first before you drained it.