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Rear differential fill plug specs

cropduster

New Member
Joined
August 14, 2020
Messages
2
Reaction score
1
City, State
Seattle, WA
Year, Model & Trim Level
2005 Explorer XLT
Hello,
The rear differential fill plug (square drive 3/8) on my Explorer is starting to round off. I'd like to have a replacement handy for the next time I check the fluid level. I had no luck searching for it on auto parts websites, and I'm pretty sure the guys at the local dealer will be of no help.
Is it a standard threaded plug that I can buy on any auto parts store? Or should I try my luck at the local junkyard?

Thanks for your help.
 




drdoom

Well-Known Member
Joined
December 13, 2007
Messages
4,370
Reaction score
162
City, State
VA
Year, Model & Trim Level
2005 Eddie Bauer 4.6L 4X4
I have purchased one for the transfer case at Advance (just a standard plug), but I'm not sure about a 3G rear differential.
 




imp

Well-Known Member
Joined
November 12, 2009
Messages
4,665
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616
Location
West-Central AZ along the Colorado River
Year, Model & Trim Level
59 Ranchero F250 D'Line
Hello,
The rear differential fill plug (square drive 3/8) on my Explorer is starting to round off. I'd like to have a replacement handy for the next time I check the fluid level. I had no luck searching for it on auto parts websites, and I'm pretty sure the guys at the local dealer will be of no help.
Is it a standard threaded plug that I can buy on any auto parts store? Or should I try my luck at the local junkyard?

Thanks for your help.
Most fill plugs (not all) have square male heads; some have square or even hexagonal female sockets. I have seen them sized from 1/2-inch standard pipe thread size to 3/4-inch.

But tell me now, given the fact that pipe threads are TAPERED to promote sealing, how would you tell one in Standard SAE size from Metric? Has anyone seen a metric pipe size, either a chart or real part? Gotta be one!
 




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