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Did some research from what ive found no one makes a direct bolt on crossmember. So what to do? I ws hoping aje would have one but no luck according to their website.
Reason being is that the tranny does not fit in the tunnel without some "massaging" of the tunnel with a hammer. I am about to have to make one as well.
Plan on beating the crap out of your trans tunnel or cutting it out and welding in new panels. Specifically around the fluid lines and the large electrical connector. Those were the areas I had to massage.
I used an AJE mount for a 4L60 (or similar, don't know for sure) and added a fabricated mounting bracket behind the stock mustang brackets. Still using the stock bracket, just not exactly as originally intended. There's a few pics here:
I'm in the middle of developing one right now as part of the upcoming Hooker Fox body LS swap system...this image shows a 4L80 install mocked up on the crude prototype, which is then digitized and turned into the actual production design within our CAD program.
Anything ever come of this? My notch lq9/4l80e project (son's first car) is crawling along...
The Hooker LS Fox Body engine brackets and transmission crossmembers are the next products in line for me to push on getting released and on the shelf. I had to hold the crossmembers back to be validated for use as part of a Coyote engine swap system that came after the development of the LS system. Now that the validation work is done, I can proceed towards release. From this point we're probably looking at 45 days.
Nice to see someone finally making something for the 4l80 in a fox. I found they (the trans itself) fit in the tunnel pretty well with just a few hammer taps but like shown above, you can't just bolt a cross member in. I used my AJE 4L60 cross member and welded in a couple new brackets like a few others did. They sure did not look as nice as the holley/hooker's will but they got the job done for cheap!
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4l80e crossmember for fox. 
