Novak also has motor mounts/brackets, just check on their website. Might also look at advance adapters website too.
Fyi the ax15 is a medium duty transmission and can stand up to quite a bit of power.
To quote Novak's website:
"The AX15 actually makes a very clean conversion to most GM engines and because it is a stronger transmission, it is well matched for the Chevy V6 and Chevy Small Block V8 and Gen. III+ V8 engines."
I used the Novak mounts on my conversion. Make sure that the mounts clear the front drive shaft if your jeep isnt lifted. Or else you will have to lift it. Also, I used the Novak transmission adapter.
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