Gear vendor is considerably more expensive. 600 HP thru a 727 is fine. Not sure with the overdrive? Lock up converter only?

I run one in my Charger, has some Diesel parts in it & a stronger main overdrive spring, billet servos,lock up 4k converter street strip car, no dyno #s,easy pass 4050lb , full exh out the back, D raidials 1750 DA, 11.33 @ 121.1 short shifting. 2500 hard miles on it

I dont do it with OD or lock up.. but the 1, 2 and drive is no problem

This also ^^^^

Diesel guys do it, and at 500 rwhp, your looking at over 1000 ft/lbs

What vehicle are you considering to install it in?

How much wide open throttle will it see going in to overdrive?

How much toque is the engine making ?

I just want the overdrive to kick down my 4.30 gears. I'm attempting to build a very stout strip/street car that I can drive to the track. I'm also looking to the future and a pass down the Texas mile so there will be power applied to the overdrive but not in the 1/4.

You’ll be fine then with a properly built trans.
The basic overdrive unit is strong enough for that occasional use.

I run the 518 in my Rampage.. its a 416ci... I dont have lock up.. just
the OD.. it has 4.10 gears in a 9" with fuel injection.. if you start puting
the power to the OD you will start slipping the OD clutch.. my buddy
races his 52 ford PU with a 700r4.. he didnt have any issues until the
conv quit.. he went through 4 conv until he got one to work again but
now he doesnt use OD or lock up on the track.. I know from building
the 518 that the OD clutches are pretty small and cant take a high load..
I pretty much just keep it in OD on the street.. as soon as it shifts into
drive it goes right away into OD.. If you want to run the mile you better
get the Gear Vendor.. I was gonna get one but figures the cost VS
not using the OD on the track... my 416 makes 525 ft of torque

Guys, build the OD section to 2006 diesel specs and you can drag race that thing with the OD on. Think about it for a minute, the 47/48 diesel trucks are towing 20,000 lbs plus in OD these days. Just go get the thin snap ring, the OD retainer plate and ditch the wave spring and you get an extra clutch and steel in there. Also, if I’m not mistaking the diesel spring is heavier than the gas job.

H

You are correct in stating the O/D clutch can handle the power. And your comparison to the diesel is correct as well.

Side note - The Large spring in the OD unit (some people call it the OD spring - it’s called the direct clutch spring) is not any different between the gas and diesel - it’s just painted because it was tested (when new) to be at the high end of specification. And it’s off when in OD - the only clutch driving the vehicle in the overdrive unit is the OD clutch.

In any forward gear besides OD the spring then applies the direct clutch and the ORC assists the direct clutch.
In reverse the direct clutch and spring drives the unit.

Is this for a big block if so what is the plan on the transmission case to adapt to it

My Hemi made 697hp on the engine dyno. I put a non lock-up 518 behind it by changing the bell housing. It has 3.91 gears. I did build it to the heavier V10 and diesel specs and with a custom forward manual valve body built by A&A. I also used the aftermarket heavier OD spring. I don't know if it was necessary, but it got it.

I have a manual button for the overdrive and an adjustable vacuum switch to drop it out under load, kinda like a passing gear. Been in there 3 years, and so far I have been very happy with it.

I run my diesel through all the gears and lockup too. To be fair though the diesel converter is huge and it has a billet cover. The stock converter didn't last long before the clutch started slipping. CRT makes a full manual valve body with a trans brake and with or without lock up. Only the lock up is on a switch. 1, 2, 3 and 4 are full manual control.

518 in this 6500 lbs truck runs 10.80s and a small wheelies using my trans brake

PPP makes a killer shifter for my valve body

I offer a street and all out race version shown here

a wheelie with that 1000lbs steel brick in the front is amazing

A little story about that blue pickup…. a few weeks ago I was at a local tire shop getting my new drag radials mounted and balanced and the guy drove in that truck ( sans slicks) for an alignment, seems he lives nearby and didn't feel like trailering it. Nice guy he told me it made over 1,000 ft. lbs. of torque and that he runs a trans brake to allow him to spool the turbo up for launch. He was at Island last Sunday testing but I didn't see his times. i run a 518 in my D150 with a T/A shift kit and worked lock up convertor by Ultimate it 60 fts. well ( low 2.0s ) @ low 15s but its nowhere near 600 hp.

My brother is in the process of building a 500 for his small block and I've seen how much he's spent so far. I'd go shorty 727 and a Gear Vendors every single time.