But those would have been the weaker 3 speeds, not the 3.03 the OP has.

 

Don't think a 3 spd. would hold up in my setup. LOL...Somewhere between 767 hp and 1,017 hp it would blow. I'm guessing about 530 hp. Depending on weight of vehicle.

 

As I said before, it all depends on how you use or abuse it.

 

That statement applies to many things, not just a transmission. lol...

 

I also had a 57 Chevy with a 394 olds punched to 406 with a slant pan hydro tranny. Could blow *** ends at will at any speed under 50.

 

That's true, transmissions wasn't the only things I broke, in the quest for power and speed anything connected to the crankshaft is subject to failure, even the crankshaft.

 

Back when I did a V8 swap in an 89 Ranger everyone said the 7.5 rear wouldn't hold up. It lasted a couple years before it started leaking gear oil out of the right side brake drum. Swapped in an Explorer 8.8. The stock tiny u joint driveshaft lasted even longer until I tried a dry burnout on a rough asphalt parking lot, and dumping the clutch, dropping the hammer on the Toploader 4 speed. The 275/60's bit too hard and the middle portion of the shaft snapped. (the solid splined portion) The tiny U joints held, (amazingly)

 

I have done a bunch of 427's. Current one is 4.25 x 4.25 (482) with Dual Quad EFI, Home built headers, solid street roller

 

You should be ashamed of yourself...…………………...posting **** like that here

 

Drug a 20,000 pound tractor home last year on a 6,000 pound trailer behind a 7,000 pound pickup over Homestake pass and Cardwell hill with a lowly 410 under the hood. Grossed just shy of 34K. Need to haul a 9K pound slab of concrete? Why not...


If you want to build any engine and are looking for advice on parts, the first thing you need to do is establish a budget. Whether it be $2K or $20K, you need to tell us what you have to spend. Cubic inches might not be the most cost effective "HP per dollar".

The second thing to do is throw said budget out the window...

 

What direction was this ? If I recall the grade eastbound is shorter than westbound on Homestake

 

Bottom line for towing is torque. Our 767 hp Fe has 713 ft. lbs. torque. Our 2012 6.7 powerstroke diesel has 800 ft. lbs. of torque. No competition. Diesels win hands down.
Sure you can pull about anything with a FE, with the proper gearing, even a 360 ci. FE, but it is going to strain and moan and groan with heavy loads. If you are happy pulling a load up a 6 or 8 degree grade, watch for snails passing you on the left.

 

And ping like a bitch doing it. Grades down here are posted as percentages, I don't know offhand how that converts to degrees. Homestake as I recall wasn't one of the biggies down here. The railroad over it is 2.2% (2.2 ft up for every 100 ft forward) I've been on 6 to 10% grades and one in southern Utah that had to have been a 15-20%. Most on interstates are 6-9% and Homestake I'm pretty sure wasn't that steep, never heard any stories about it on the CB radio. The big ones all gained reputations. Where in the rpms did that 700 ft lbs happen ? I'll bet it wasn't in the lower rpms where the 6.7 makes it's torque. That's the real difference.

 

Our 511ci engine dyno sheet from Keith Craft

rpm torque Hp
5,000 713.0 678.8
5,100 708.8 688.2
5,200 704.2 697.2
5,300 699.7 706.1
5,400 695.1 714.6
5,500 690.2 722.8
5,600 685.6 731.0
5,700 680.4 738.4
5,800 674.2 744.6
5,900 667.4 749.7
6,000 659.9 753.9
6,100 652.2 757.5
6,200 644.6 761.0
6,300 636.4 763.4
6,400 627.7 764.9
6,500 619.7 767.0
6,600 610.8 767.5
6,700 600.7 766.4

The dyno test was listed from 5,000 rpm to 6,700 rpm. So I am assuming that our engine made 700 ft. lbs torque around 4,900 rpm.
Of course this is a drag strip engine and not a street engine. Not meant to pull anything.
Our 6.7 psd engine makes 800 ft.lbs. torque at below 2000 rpm. It is made for pulling what ever you want to pull.

 

Yea, that's the difference with a diesel. It makes it's torque at half the rpms a gas engine will.