How much can these transmissions handle built? I want to keep an OD transmission with my motor, particularly the 700r4, but I am being told by a couple different people that even with this transmission built to handle 650hp, it will not last. Is this true? I know I had heavy duty clutches, and a couple other weak components replaced before, and it didn't last more then 2 weeks with the motor I have now. But I would like to build it so it does last. Any info would be appreciated. Thanks.

 

You should call Bowtie Overdrives and talk to them. They have been recommended by Car Craft and Hot Rod and they have a good reputation.

760-947-5240; they're in California

You probably need something like this:
http://www.bowtieoverdrives.com/cata...SUBCAT&CATID=B

check out the level 2...

 

I have a few out there with the HP numbers you are talking about with very little problems. Bow Tie Overdrives units do not last at these HP levels, I have had a few come through the door over the years that were supposed to hold up to HP numbers less than yours, and didn't. This is my specialty, helping others build these right. I have everything you need to do this, let me know if I can be of help?

 

My Pro-Built was flawless with 500hp but I sold it because the plan is 750'ish @ 3500lbs and breaking stuff is not something I want to tempt so I overkilled it with a powerglide. If Dana says he can build it for what you need, I'd go that route only because of previous experience. I don't know anyone local who I'd recommend for a 700.

Don't you want a trans-brake? I think you do.

 

I am not trying to steal the thread but

pro built how dose your 700R4 Pro Street Elite compare to the level 4 patc 700 raptor in durability.

level 4 patc 700 raptor link

pro built 700R4 Pro Street Elite link

 

Thanks Denny. I will look into that.

A transbrake would be nice.

 

The Pro Street 4L60E has run 9.38-9.80's at 137-144mph in a 3,650 lbs. w/driver in a street driven 1995 Firebird with over 300 runs, and he built it himself. This is over 800FWHP. I have others in the high nines with the Pro Street setup, that I helped them build and have built. The Pro Street Elite should even take a little more and live longer. I do much more to the accumulation system than anybody out there, and this offers even smoother part throttle shifts, which is one reason as to their longevity. Plus there is much more. I have not heard much about Raptor on any of the website message boards, but they do a lot of marketing.......

 

Great! So what would you recommend? I have CK Performance 3500 10 1/2" stall, I would like a transgo shift kit again, I have a B&M trans cooler. The motor is pushing probably around 500rwhp at full boost and this is a street car. What would you recommend?

 

The biggest killer of the 700R4 is heat. What ever route you go, get a transmission temperature gauge and keep an eye out. IMHO, there is no way to truly gauge the horsepower capability of a tranny unless you factor in the way it will be used. Street driving with a high stall converter is hell on a transmission. You'll need a monster trans cooler, preferably one with a dedicated electric fan, if that's your plan. Once you addressed the heat then find a tranny builder that upgrades the 700R4's inherent weaknesses. An upgraded sunshell and stator, bigger pump, better clutches particularly the 2-3 set and upgraded servos should all be standard equipment on a 700R4 built for high horsepower.

 

This is the cooler I have Link

Do I really need one with a fan? Mine is front mounted.

 

That's why I suggested the gauge. If you're getting enough airflow without the fan...and the cooling capacity of the cooler is big enough, then no. But there is no way of accurately knowing without the gauge. I would purchase the guage and then make any adjustments needed from there.

 

cool, thanks.

 

my transmission is being rebuilt right now built to handle 800hp right now. i am also using the ne tci valve body that maintains 200psi of pressure at all times, it prevents transmission meltdown.

 

At WOT 200psi is not enough, and it is way to much for part throttle, and is very hard on the front pump. It will probably give you really firm part throttle shifts. I hope this TCI valve body works for you.......

 

Are you saying that you can get valve bodies with more pressure than 200 psi at all times?

 

Great! So what would you recommend? I have CK Performance 3500 10 1/2" stall, I would like a transgo shift kit again, I have a B&M trans cooler. The motor is pushing probably around 500rwhp at full boost and this is a street car. What would you recommend?

 

no, he's saying exactly what he said. 200 psi isn't enough at WOT, but it's too much at part throttle. Too low of pressure at wot will cause clutch slippage and other heating issues, while too much pressure at part throttle will cause excessive wear and tear on the pump as well as "bang shifts" which cause excessive wear and tear on the planetaries and other hard parts. That valvebody will more than likely be the death of your trans. There's nothing wrong with a TV system, it was designed in these trans for a reason.

Probuilt(dana) has a very good reputation. PATC also has a solid rep. I have never bought a complete trans, but have bought all my parts(thus far) from PATC and have had great success building stout 700's. If built properly they can withstand over 800hp w/o issue.