Speedometer cable leaking and its New

I purchased a speedometer cable from
Classic industries. The end that goes into the trans on my 64 valiant vert 904A
Is leaking. The body that goes into the trans is held on by 2 cir clips.
It’s leaking out were the cir clip is on the bottom. The pinion seal is installed correctly as well as the main body seal on the cable end. Has anyone else used this cable with any success? It doesn’t seem like it’s even possible to seal properly given that the body end is not one solid piece. Any help would be great. Thank you in advance.

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You might ping @WV64Signet as he just went thru a whole bunch of 904 love.