mustang transmission problems from to much power?

what mods?i doubt it it's your trans is it an auto or stick? sounds like a auto,get a rebuild and a better stall if you have that much power.

If your engine rpm doesn't change when you floor it, something is wrong with your engine or fuel delivery system. Is it a grinding noise or sound like marbles.

If your tranny couldn't hold the power that you have, the engine would rev up and your tranny would slip. I have a car that I just built a new engine that I blueprinted, upgraded the internals and heads (rebuilt transmission too) and now I can tell that I really need to upgrade transmission some more, when I get on it the rpm's come up really fast and each gear change the tranny spins a little bit and then slams into gear.

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If it sounds like marbles, then you're experiencing pre-detonation. Your car is running lean due to your upgrades, it could be the sensors that you removed when you took out the cat, and the chip probably provided more advance. If you're not running 91 octane I suggest that you give that a try. Other wise you need to "plug in" and adjust your chip to provide more fuel. Maybe larger injectors and a little more fuel pressure.

Pay for a couple of runs on a dyno, the technician will know immediately whats happening.

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By the sound of it, the transmission may be slipping.. if you have issues with the torque convertor it can cause issues and noise also.. but without power braking and see it's hard to say

Also, Is the transmission fluid in the cross hairs?????? loosing tranny fluid can cause and do weird stuff

You need A LOT more power than that to trash an AOD. Check your TV cable, those litlle beyotches get just a little out of whack and it feels like the trans is going to fall out!

Yes it can be. You adding that much more torque the clutch plate is mostly getting ripped up. i would up grade the trany and reinforce it a little more. I would also think about upgrading the rear end gears and u-joints and the drive shaft as well. this will keep you from getting stranded and from having more problems.

the rpms would go up and you would hesitate before you go if it was a transmission slipping. the transmission is good for at least 375 hp before it needs work.

Add more infoe to your question like

auto/man millage

what stuff was done and brands used

could help pinpoint intermittent power loss

Change them rear-end gear's !!!