HEX Size Needed To Remove Drain And Fill Plugs

[RMurano]

It’s time to change transmission (G56) and transfer case (NV273) fluid. What size hex wrenches are needed to remove drain and fill plugs for G56 and NV273? Also, should I run the truck up to operating temperatures before I change fluids? Thanks for your help.

 

[Bodie]

I forgot the actual size, but I know its metric...

 

[AKaiser]

Yes, I would get it at least very warm. Drive it 15 minutes or so.



Hex Keys: Got mine at Autozone. Turns out, they have a 3 piece metric hex key socket set there, I think by Great Neck or some cheap chinese name. The middle one is the Transmission Hex. I had to use a large standard (slightly undersized) hex key and an adjustable wrench to open the TCase, as the smallest of the 3 hex key sockets is bigger than the TCase plug. It's smaller than the head on a 5/16 bolt, which I checked from Dad's bolt bins.

 

[RankRam]

The G56 = 14 mm

 

[klenger]

#ad




A 15 mm bolt with double nuts works too.

 

[AKaiser]

A 15 mm bolt with double nuts works too.

True, and I thought about it, but the hex socket isn't terribly expensive, and it works perfectly. Plus, no metric bolts yet on the farm.