I am going to be replacing my 700R4 transmission with a Pro-Built Street/Strip 700r4. When I do that I want to replace the torque converter with a 2800 RPM or 3000 RPM stall converter. See my sig for car details. Stock torque peak is 3200 I believe. I want the car to have nice firm shifts. Will a higher stall loosen the shifts. Will 2800-3000 be too much? This car isn't driven that much around town. When I do drive it, I don't take it easy with it. I want something that will fun to drive.

 

This summer i will also be replacing my tranny with a Pro built Street/Strip th700. I have been debating whether i should go with the 9.5" ACT or a 11.73" SLP converter. I have heard that the highest stall that you want to go on a daily driver is 2400. That is why im leaning towards the SLP converter, i dont want a high stall that will effect daily driving and i dont think a daily driver needs a 9.5" converter if its only going to stall at 2400RPM.

 

Go with the 3k, if you will be at the track often. If not go with the 2.8k. You can go with a Midwest Convert, 10" lock-up for $479, for an extra $75 add a nitrous sprocket, and the converter is good to 1000 hp/1500 tq. That price is hot off the presses today. One other factor, what gears u have out back?

 

who said only go w/ a 2400 stall on the street???? don't listen to that dood... i know plenty of people who run stalls up higher than that... actually i don't think that i personally know anybody w/ an aftermarket converter that stalls at below 2800 RPM... the least i would go is 2800 RPM... and that is for a stock 305/350 TPI car... AT LEAST 2800!!! for a modified car w/ cam and headers i would say go w/ a 3500... especially if it will see the track at all... i know a couple guys who are running a 4400 stall verter on the street w/ no complaints...

 

I got a Vigilante 2800 stall.

Iwent from 2.05 60' times to 1.88-1.92 60' times. Of course with Nitos'.

 

how is that 2800 on the street, now im leaning towards a 2800 stall.

 

For everyone that has a high stall converter, what STR did you get? Remember, this is for a 305.

 

If you drive aggressively, you will like the 2,800 rpm stall. If you do not, you won't like it. If it is a "limited street" application, then the higher stall is ok. Depending on what rear end gear ratio you have and at what rpm you shift for WOT will determine the STR.

 

QUestion for Pro Built, how much would shipping be on a street/strip 700r4 and a ACT 2800 stall to the bay area?

 

About $100-115 or less for the transmission, and about $25-30 for the torque converter.

 

Pro-Built, I have 3.42 gears and I shift around 5400. What STR do I need?

 

Running a 3200 stall converter if fine for street applications just make sure you run a trans cooler. Id prefer getting a flash converter like vigilante makes, which only stalls at the stall speed at full open throttle. As from what you tell me, it doesnt seem like you have a cam, thats kind of a huge converter for what your running, you usually run a converter like that with a bigger cam. Id say youd be better off with like a 2500, but a 3200 isnt really going to hurt you, and its more fun leaving off the light with a bigger stall

 

i have a 2400ish stall converter...it works great...but next time i have everything apart, i'm not putting it back together without a 2800.

i have TBI with the GMPP 350 HO crate engine...putting out between 300-350 horsepower, 350-380 ft.lbs., and run about a high 13.

-brian

 

Would there be a big difference between a 2800 stall in a 305 and a 350? Everyone that replys, please state if you are running a 305 or a 350 if it even makes a difference. I would think it would. I currently have about 220 RWHP. Is this too low for a 2800. Remember, it's not a race car but I'm certainly not "driving Miss Daisy" either. I talked to Midwest today and they recommended a STR of 2.5. Does this sound like it would be too high? What are you guys running?

 

I have no street driving problems. It just takes a little more throttle to get the car moving. I got a trans cooler which is easy to do yourself so the tranny does not get to hot from the exssesive rpms. I do have a problem with the slower shifts though. I am installing a Transgo Performance shift kit to firm up shifting except I can't get the car out of 1st gear now because of my Transgo problems which is probably due to a stuck valve in the transmission valve body(see my thread about no 2,3,4 gears).

 

Since I ran a Vigilante 2800 last year I will give you my thoughts.
For a stock 305 TPI it is too much. Not that it isn't streetable, but it will be too high for the rpm band.

I ran mine in a stock cam and heads 350 TPI and the STR was 2.5.
On the street even with drag radials there was no such thing as traction.

Here are the differences I found at the track:
Stock Convertor 60 ft-- 1.95, et. 13.88, mph 101
2800 Convertor 60 ft-- 1.79, et 13.97, mph 95

As you can see it pulled great 60 ft's but there is just not enough high rpm hp to justify that much stall (again especially in a 305).

I wouldn't go any higher than the 2400.

Bob

 

I am running the SLP converter. It stalls about 2100 rpm but it flashes to 3200 right of the line. I use to use this converter with my old 305 and it would stall at 1800 and flash to 2800 rpm. I was thinking of going to a 2800 stall but am worried about how it will affect my track times.

 

It looks like the majority of people think that 2800 will be too much. I am just afraid to go with a 2400 and it not make much of a difference over stock or just not be enough. Anymore comments or ideas for the STR?

 

BTW I short time in the 1.68-1.70 range with the SLP

 

ok...brain fart...what the heck does "STR" stand for?

i feel like an idiot, because i am sure i know what it is, i just cant figure it out. thanks...

-B

 

Stall Torque Ratio

http://www.converter.cc/technical_discussion.htm

 

ok...well, i actually didn't know what that meant. but, that is very interesting.

not sure how i have made it this far without knowing anything about that, but whatever...i guess you learn something every day.

thanks..

-B

 

I have a probuilt tranny with a 2800 vigilante. Everyday driving you really don't notice the stall is there. I'm glad I got the 2800 and just because you get a 2800 it doesn't mean your engine is going to stall at 2800. It will vary based on how much power your engine makes.

Later

 

Yeah i was wondering about that because i have an 89 firebird formula 305 TBI, and it's torque peaks at 2400. (It's all stock for the moment). So should i get a stall converter at 2000 rpm, or should i go higher?

And another thing. I am planning on installing a shift kit, but i don't know which one to go with. I have heard from some that a Trans-Go shift kit is great, but then again i saw a post on this forum that said it was having problems. The other one i was considering was a B&M... If anyone has any experiance with any of these products, please let me know. Thanx in advance.

-Mike

 

I think I have decided to go with the Midwest 2800 with 2.2 STR.

 

Looking at your numbers, I WOULD NOT go any higher than 2500 stall. Anything above that for a long tube runner TPI car will hurt more than help.

The TPI car is all low end torque saddled to a trans with a very numerically high first gear. This is where the TPI does it's magic.

I have a 10" 2500 stall non-lock Continental converter and I pull 1.900 60ft times on 275/40/17 Yokohama A520s!!!

See my sig below.

 

I don't know how 88 IROC Bob lost that much mph with the converter, something else HAD to have come into play there, thats a gigantic loss of efficiency.

Actually, my best guess would be the forced TCC lock-up killed you. Stock it's set around 75mph. What ends up happening is you shift into 3rd around 65mph +/- and things are going great, then you hit 75mph and the converter clutch locks and instead of humming along at 42-4500 you get sucked down to 3500, completely killing your power

I have a 3k stall vigilante behind an all stock 305 TPI. My mph stayed exactly the same with it though. Of course i'm in the chip, and thus i don't have a forced lock up problem.

Yes it's a little much for a stock cammed car, but it still did nothing but good for my timeslips anyway, and down the road i don't need to restall the converter when i get around to doing something else with this tank.