GForce Engineering fully-fabricated 9” IRS With modified cradle

[Jon-MooredPerformanceLLC]

@Marc W didn’t you do testing with the 9in and lose 50 hp?

 

[Ta2ude]

@Marc W didn’t you do testing with the 9in and lose 50 hp?

I have read there is a 10-20 whp loss on a 800 hp car with the 9”.

 

[Marc W]

@Marc W didn’t you do testing with the 9in and lose 50 hp?

We did not come up with an exact number but you can read up on why the 9” exacts a hp price in drivetrain power loss. Has to do with pinion placement in relation to the ring gear. I basically went to the TH400 at the same time as the 9” rear. At that time a 3.40 ratio was the best you could do and that is too low to work with the 8spd if you were making 1000+ hp. I believe you can get 3.25 and 3.00 ratios with the 9.5” gears. Not sure. I haven’t shopped that for a while now. Back when I was doing that, it was really about trying not to break. The stuff available today wasn’t even dreamed of back then.