07 GT500 stock long block horsepower limit through an auto

[FourEyedFord]

How far can a stock 2007 GT500 long block be reliably pushed power wise through an auto? I obviously don't want to have to worry every time I get on it though either. The engine is actually in a 3300lb foxbody also, and I am thinking about putting a 4r70w or 6r80 behind it. Thank you for the input!

 

[Coonsnake]

I ran 9.5s with a stock long block thru a 4r100 in a 3900lb gt500

 

[Catmonkey]

Connecting rods are the weak links. Reliability issues are likely to happen if you push it more than 6,500 rpm on a recurring basis. Some engines have held up better than others once they get to ~750 hp. If you want to beef it up, change the rods.

 

[biminiLX]

Lots of exciting things coming for 6R swaps, if you haven't committed to a trans I'd do the 6R all the way.
We just fit one into my brothers notch and minimal tunnel clearance issue. My friend with a TVS Coyote '11GT has been 9.40s with a 100% stock 6R, and I mean stock down to the fluid.
The rods and specifically RPM are the issue, so I'd recommend 750rwhp and shifting 60-6200rp, for a long happy life. 700rwhp with the same torque in a Fox with a 6R would be a 9sec ride all day with awesome reliability.
Good luck.
-J

 

[FourEyedFord]

Thanks for the info guys. I plan on keeping the revs below 6500rpm. The car has a trinity on it now, but may get a Gen II housing upgrade, so it isn't like I am putting a big twin screw on it.

 

[FourEyedFord]

Lots of exciting things coming for 6R swaps, if you haven't committed to a trans I'd do the 6R all the way.
We just fit one into my brothers notch and minimal tunnel clearance issue. My friend with a TVS Coyote '11GT has been 9.40s with a 100% stock 6R, and I mean stock down to the fluid.
The rods and specifically RPM are the issue, so I'd recommend 750rwhp and shifting 60-6200rp, for a long happy life. 700rwhp with the same torque in a Fox with a 6R would be a 9sec ride all day with awesome reliability.
Good luck.
-J

Thanks, and that's good to here! I didn't think it would be all that bad to put a 6r80 in a fox. I plan on running a bone stock trans with a circle D converter and a Power By The Hour control pack.

 

[Mainn]

Thanks, and that's good to here! I didn't think it would be all that bad to put a 6r80 in a fox. I plan on running a bone stock trans with a circle D converter and a Power By The Hour control pack.

6r80's are super strong in stock form; you can't go wrong. Good luck with the swap, let us know how it goes. To answer your original question, keep it under 700rwhp and you should be fine.