HELP! - Tranny fluid won't go in

Trying to re-fill my tranny w/ Redline MTL.
As I began to fill, some fluid starting running back out.
Tranny in neutral.
Can barely get the hose (3/8" inside; 7/16 outside) much past the threads before I hit something.
Using a Cooltech Lube Mover (similar to a pump up weed sprayer, but with a 7/16" clear vinyl hose on it). And I'm slowly pumping the fluid.
I'm sure I've got the Fill Plug--passenger side, uses the same 8mm hex tool as the drain plug did, aft part of tranny, sort of above drain plug.
Do I need a smaller hose to fit in there?
I've read Neutral is required to get internal parts out of the way, but I'm hitting something pretty quick.
And I'm holding the hose "downhill" into the tranny, but some fluid flows out as I'm slowly moving fluid.
What am I doing wrong?
Thanks

 

[moto]

Yes. It definitely has to be in neutral.

 

[VoodooBoss]

I would shift through the gears and see if it opens up.

 

[drano38]

Well, I might need to turn in my man-card :-[
Not sure I was really in neutral on the first attempt.
Tried it one more time, got the hose in further, and all went well.
Using a bent cable tie as a dip stick, I'm 3/8" below the hole, so I'll call it good.
Now to wash Redline MTL out of my hair. . .
Thanks for the fast replies.

 

[Fat Boss]

As long as you got some nice stinky gear oil in your hair we won't make you turn in the card. ;D

 

[F.D. Sako]

Ya, I had to jiggle the hose in and turn the end down a bit to find enough clearance for it to go in a bit.

I've also ruined a nice jacket to gear oil

 

[WinterSucks]

That stuff stinks a lot, too. Or maybe I am thinking of the Diff... I found that I had trouble if I tried to pump too quickly, too.

 

[drano38]

Fluid washed out of hair fairly well, although I could have left it in and done a spiked style but I don't think the boss would have seen the humor if I showed up for work that way.
Next year I'll try a 1/4" hose to make it easier to get the hose far enough in, and it will also help control the flow.
Everything is tightened up.
Now if my Setrab 934 cooler would show up so I can get that installed . . .

 

[Fat Boss]

FWIW I use a longer clear tube with a vintage Coleman funnel on it. It takes longer, but I can stand and pour oil into the trans with it. Works for the diff too. Hint: always put your oil bottles in the sun as far in advance as possible!

 

[steveespo]

Lube Mover from Cool Tech is a really great tool. I just ordered a second one so I have one loaded with gear lube and one with trans lube. $29 each and they work like a charm.
It's funny ut I haven't had an issue with filling the MT-82s with it in gear.
Steve

 

[Grant 302]

As long as you got some nice stinky gear oil in your hair we won't make you turn in the card. ;D

But I thought getting it in on the first try was what mattered?

Changing your own gear fluids...proof enough. 8)