Maximum 4K RPM due to Torque Converter?

[TheRoaringEagle]

Hi, I've heard that people used to use Torque Converters from a 6 cyl. car on their V-8s to help them in the 1/4 mile.

It's a 400 sbc bored .060 over with a TH350. It has 3.42 final gears and has a hard time on the freeway going 70-75 mph @ close to 4k RPM. I never cruise that fast on the freeway cause it feels like there's a lot of stress. Some of it was relieved switching from solid to polyurethane motor mounts.

Anyways... could the Torque Converter limit the engine speed of my 400?

I just want to be ABLE to get my Camaro up to 6-6.5K RPM without blowing it up or feeling like the subframe is going to rip away the body. Possibly hit the triple digits and be able to really drive this puppy!

[TheRoaringEagle]

anybody?

[Bill Howell]

You are lucky if you have a 60 over 400 and do not have overheating issues. I never could kept mine cool. I have never heard of a torque converter restricting rpm unless there was a problem with it. I would think there would be some major viberation if that was the problem though.Depending on your rear tire size 4000rpm @ 75mph with a 3.42 might be about right(sounds alittle high be not bad).Maybe it is a 3.55 gear. Either way that is pretty tight if you plan to cruise much.