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Q: Roar from underneath while driving...o on 1991 GMC Sonoma

I've replaced the manual transmission with a T5. I've put in Dextron/Equiv. fluid in this, as it is the recommended trans. fluid for it according to my Haynes repair manual... I replaced the rear seal in the transmission, awhile back and checked the fluid level in it, added a qt and a half into it. Any reason for this to continue to roar?
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Is it possible when transmission was replaced the exhaust is against the transmission causing it to vibrate and give you this "roar" sound
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