Jeep CJ7 w/wet cavity between the Dana 300 & AX15

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Im in a bind. I have a 1985 Jeep CJ7 and blew the factory T5 transmission. I researched swap options and for the mostly city driving year round from 40 above to 40 below centigrade and medium duty off road use i opted to swap in a medium duty AX15 between my inline 258 (4.2) and the Dana 300 transfer case. Im done all the work now and am getting ready to put fluids in.

I am an Amsoil fan and planned to put MTF into the AX15. I then planned to put 75W90 Gear oil in the Dana 300 (soft yellow metals in both).

The swap introduced a cavity between the AX15 and D300 with an upgraded double seal. I hate relying on shaft seals to keep fluids seperate though and dont believe it will prevent sepage back and forth. This cavity will likely become a wet cavity and i sealed the mating surfaces anticipating the eventuality. Any advice on running the SAME fluid in both gear boxes (the AX15 and the D300)?

First post so please be kind.

I do want to stay away from certain GL5 fluids that are not specifically marked as safe for soft yellow metal.

Thanks
 
i ran amsoil MTG in my my ax15 and dana 300's and the dana 20's i had years ago. no issues.
 
I am not sure what the difference between a MTF and xxw90 GL-4 is, but I've strictly used GL-4 gear oils in manual transmissions.

I want to say Amsoil prefers you run the same fluids in the gearbox and transfer case in the event of a leak. This question rose up a while back on here when (I believe) someone needed something for their manual 4x4 Toyota. Either way, if you're using yellow metal friendly oils in both, you should be fine.
 
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Should be no issue. you dont have any hypoid gearing in either of those.. so neither requires a gl-5

And a gl-4 will be fine in both.

I would just get whatever MTF you want to make the MT happy.. and most transfer cases are good with just about anything.
 
Originally Posted By: Chris142
It wont leak between them if you put the seal in correctly. I hope you used the 94+ ax15 with the external slave.


Yep. 94 AX15, external slave, clock ring, clipped the shift link ear, double seal on the input shaft of the d300, custom fab a bell housing dust cover, modified a 94 transmission mount, snugged up the skid plate, all new bolts, new seals, new bearings, re-built the d300, new flywheel and clutch, new rear main seals, one piece pan gasket, and valve cover gasket, oil filter, new magnetic drain plugs, quick shifter, twin sticks, and a bronze skull shift knob to top it off Alberta redneck style!
 
Originally Posted By: Alex_V
The 300 is a stout unit that certainly shouldn't care about small details of the lube in it. I'd probably run Ams's 75w90 GL4.

Why 75w90 over the MTF?
 
Originally Posted By: Rand
Should be no issue. you dont have any hypoid gearing in either of those.. so neither requires a gl-5

And a gl-4 will be fine in both.

I would just get whatever MTF you want to make the MT happy.. and most transfer cases are good with just about anything.


Thats what im thinking.
 
Good looking Jeep. I just hope they don't use a lot of salt where you're at.

Sadly, it's pretty rare to see a CJ or any AMC era Jeep on the road here.
 
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