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Transmission fill check plug size

12K views 5 replies 4 participants last post by  wow 
#1 · (Edited)
What size allen (square) is required to correctly remove the various transmission fill/check plugs? Any other fill checks on gearcases that are out of the ordinary?

Got the allen, just wondering about the square size....
 
#4 ·
Well, none of the sizes are out of the ordinary.
What one should be aware of, is there are 2 sections of the gearbox/transfer case assembly that have separate sumps.

Front transfer case has 1 drain, 1 fill, AND 1 Level check plug. Thats 3 plugs that have to come out on the front of the trans.
The fill plugs are all big 3/8" drive square plugs. All drain plugs are iirr 12mm(maybe 13mm)socket heads. The 1 separate level check is also a socket head plug, like the drain plugs, iirr.

The gear case has only 1 drain and 1 combination fill/ level check plug.No separate level check plug like the transfer case.

Front diff has a large Allen plug on it. Don't remember exactly if it was 7 or 8 mm, but it was bigger than the 6mm engine drain.
 
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