dterry68

I found a 351w that a guy built he said its pushing around 450-500 horsepower. He said he had a stock c4 hooked up to it and that sounds a little weird. I didn't know that they could withstand that much horsepower. I was wondering what would be a good transmission to hook up to it without spending thousands of dollars. Any advice is appreciated.

68MustangCoupe

with that much power... You're kind of limited when cost is involved. Top Loader 4 speed if you want a Standard... Don't take my word with this but I think C6s were used primarily on Big blocks from factory, and c4s on small blocks *I.E. 351w* So it "SHOULDN'T" be much of a problem, but if you don't want to trust it with that much power... a c6 if you want to stick with automatics... which a lot of these can be found in Salvage yards with few new parts needing to be purchased...
AOD's I've read afew places can be Cheap by comparison but I haven't looked much into it being it's an automatic Tranny and I personally am going for a 5spd.
AOD's would also yield better gas mileage.

*Other members Correct me if I'm wrong*

Hope that helps a bit.

fakesnakes

TKO600 for a 5-speed manual or an AOD for an overdrive automatic.

67mustang302

A good trans that will reliably hold power ain't cheap. The TKO's now are going for around $2,000-2,200 new, plus all the other crap you need to swap them. Putting a TKO in brand new you're looking at around $3,000-3,500 realistically. Couldn't tell you on automatics, but I know there are a lot of people running C4's behind powerful engines.

Starfury

You can buy built C4's designed to handle that much power. I think even Summit has some.

C6's will hold a lot of power, but they're horribly inefficient. IIRC, they use something like 40% of the power produced. You make up some of that in torque multiplication, but still, that's a lot of power going to waste.

JMD

C-4s should not be under rated...

Stock they can be pretty good, and they can be built to hold upwards of 1,000 HP...

It seems as if the the little C-4 is working so far.... and if it were me I would run it till it broke and then get a better c-4 to replace it...

It doesn't need to be complicated...

For one reason or another, "built" C-4s seem to be kind of expensive when compared to other transmissions of the same era, but still, when the cost of conversion is considered, a built up C-4 makes more sense...

I like C-4s....

dterry68

well i mean i dont know if he is selling the transmission too but i will check into that. I was looking for one that is efficient but not waste a lot of the power the motor is making.