Auto trans swap options?
Race Director
Joined: Oct 2004
Posts: 12,861
Likes: 4,662
I prefer a car I can drive everyday. I’m not going to drive a 1200 horsepower C5 to work and back everyday. But give me an engine like @grinder11 , a nice 500-550 wheel and drive it 100,000 miles, now that’s enjoyment, IMO. A stout 4L60E that can handle the power is fine with me.
Drifting
Joined: Jul 2004
Posts: 1,659
Likes: 683
From: Pingree Grove IL
RPM can probably build them to handle 700-900 horsepower. You would have to call them and see what they recommend depending on your desired horsepower level.
Tech Contributor
Joined: Jan 2007
Posts: 19,398
Likes: 1,139
From: Dyer, IN
Sure, and it would an easy question to answer if the average c5 was at 1000RWHP. With the exception of specialty shops, no one is building 1200 RWHP frequently.
Race Director
Joined: Oct 2004
Posts: 12,861
Likes: 4,662
To be clear, 1,200whp is probably around 1,400 crank hp. I doubt very seriously if anyone can build the 4L60E to handle that kind of power. As someone, I think Lucky, stated earlier, you'll be looking for something different than the 4L60E. If keeping the IRS, you'll need some expensive parts to make it live, and you'll have to cut the floor. If you're going that far, I'd look into the 8 speed auto, maybe even the 10R 10 speed. Research is your friend. You'll need to contact people who've been there-done that. Also, to be clear, $10,000 will merely be a partial payment...
Thread Starter
Advanced
Joined: Mar 2026
Posts: 51
Likes: 5
To be clear, 1,200whp is probably around 1,400 crank hp. I doubt very seriously if anyone can build the 4L60E to handle that kind of power. As someone, I think Lucky, stated earlier, you'll be looking for something different than the 4L60E. If keeping the IRS, you'll need some expensive parts to make it live, and you'll have to cut the floor. If you're going that far, I'd look into the 8 speed auto, maybe even the 10R 10 speed. Research is your friend. You'll need to contact people who've been there-done that. Also, to be clear, $10,000 will merely be a partial payment...
Thread Starter
Advanced
Joined: Mar 2026
Posts: 51
Likes: 5
I realize it’s a limited sample. Just doing my best to see what works for people. I don’t really have personal knowledge of who has so much power out here.
Burning Brakes
Joined: Sep 2019
Posts: 926
Likes: 613
From: Navarre, Florida
To be clear, 1,200whp is probably around 1,400 crank hp. I doubt very seriously if anyone can build the 4L60E to handle that kind of power. As someone, I think Lucky, stated earlier, you'll be looking for something different than the 4L60E. If keeping the IRS, you'll need some expensive parts to make it live, and you'll have to cut the floor. If you're going that far, I'd look into the 8 speed auto, maybe even the 10R 10 speed. Research is your friend. You'll need to contact people who've been there-done that. Also, to be clear, $10,000 will merely be a partial payment...
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