project89

iTrader: (1)

ok heres the deal i have an 89 iroc with a forged 4 bolt main 355 ported tpi twin turbos etc etc etc

now i know most ppl say the 700r4 wont live behind any kind of decent power but my v6 car makes 350+hp and damn near 475ftlbs of tq and my last transmission has held up just fine

in my v6 car i used a tci master rebuild kit or whatever they call it now, its been a few years lol.+ shiftkit with all the usuals boost, valve tv valve etc

it also has a tci 4,500 stall

now i know the 355 is going to make alot more power can it be made to hold up behind the v8? im shooting for around 7-800 flywheel hp for track days and back it down on the streets to about 4-500 hp

ur prolly asking why i want to keep the 700 well the nearest grocery store to me is 52 miles one way i do alot of long distance highway traveling so id really like to keep the overdrive trans

Orr89RocZ

iTrader: (20)

use the other cars for grocery gettin.

a SERIOUS setup to reliably handle that power is gonna cost a good bit. I know RPM transmissions makes 4L60-4L70E setups to handle 800whp but they cost 4400 bucks.

A typical full blown rebuild for 2000 or so will likely do it, but for how long will it last? hard to say. How hard are you going to be on this? Trans brake launches? any kind of hard launches? lol I think that kills trannies more so than power alone.

project89

iTrader: (1)

no transbrake, i was going to go with a 3k stall and footbrake the car
though in my v6 car i abuse the hell out of the 700r4

on the line i stand on the brakes as hard as i can and pull the ebrake then go wot
this lets me stall to about 4,100 before the car tries to move, when the tree comes down i just come off the brake pedal and drop the ebrake

poor mans transbrake lmao

launches will deffintalty be a lil hard if i can launch with boost ill be running a 28x10.5 slick on this car

other then trips to the track once every month or so it will be mostly street driven so it wont be to abused. and 2 times a year im going to take the car out to bonnevile salt flats for some top speed runs

umm my current dd needs a timming chain, and a full front end rebuild soon as the iroc is inspected the intrepid is going to the bone yard so that leaves me with a 4wd 2500 silverado which gets horrible gas mileage

Pro Built Automatics

Use the Pro Street Elite kit along with the .570" main boost valve and the .400" intermediate/reverse boost valve. This with some minor modifications to anticipate the higher torque at lower rpms should work fine here. I have a couple of these kits setup as described using turbocharging doing ok.

project89

iTrader: (1)

how would this handle boost i.e high hp/tq at only part throttle.
i live in the mountains pretty much so i do do alot of driving up steep grades so i do expect to see boost with as little as 1/4 throttle.

would a full pressure valve body be the solution to this issue or is there something better that can be done

Street Lethal

iTrader: (16)

Rick Abare was pulling 1.33 sixty foots with his Pro-Built Transmission all season long awhile back. Should easily handle your application Dave, just give Dana a call....

http://www.700r4l60e.com/

project89

iTrader: (1)

lol u know me im not going to buy a complete transmission im going to buy just the parts and build it myself like everything else i do, so i wont waste his time on the phone,when he has time he can reply.

Street Lethal

iTrader: (16)

He already did. He said to go with the 700R4 Elite Kit. Normally the Elite Kit comes with a .500 main boost valve and a .296 intermediate/reverse boost valve, but Dana recommended going with that kit but upgrading to the .570 main boost valve and .400 intermediate/reverse boost valve. Here is the kit he's talking about....;

http://www.700r4l60e.com/store/produ...&cat=19&page=1

TTOP350

iTrader: (8)

I did all that stuff plus all the newer GM roller parts from the 01 and up transmissions.. works the best out of the almost 20 700r4s Ive had..
Dont 4get a nice light 9" lockup converter, deep aluminum pan and a cooler.

I get groceries in mine also!

Pro Built Automatics

The larger boost valves and the right line bias valve and spring help to anticipate the added low rpm torque from the turbo. The "full pressure" valves bodies are very hard on the front pump, do not have enough line pressure at WOT, and to much at very low throttle openings. The line pressure is flat, no line rise. I have nothing nice to say about them. Dana

project89

iTrader: (1)

sounds good, would u recomend any specific year trans for me to use as a core?
i need the car to drive daily so i cant rebuild the one in the car so i figure ill pick up a core and buy the parts kit etc and build it on the side while i baby the stocker for now

jonarotz

iTrader: (26)

I've been down this road and I tried everything to get this trans to hold up behind a 750hp twin turbo 355. I eventually gave up and stepped up to a 4L80E and I will never look back! I am no longer afraid to lean on this thing. I was burning up the 3-4 clutches constantly.

TTOP350

iTrader: (8)

I use 89 and up transmissions with the GM 5pinion planets and roller guts out of 2001ish and up 6.0 4l65e s from caddy escalades..

Sprayed92

Hey tony how long those snack packs gonna last ya? Lol
Not a bad idea for the roller internals, ever try the z pack for the 3_4 clutch pack. Seems to be holding up well in my 700r4 behind my 13.1 383

brando278705

iTrader: (1)

If you know how to build one yourself you can pick up a kit to handle +750hp from 700r4l60e.com this basically gives you all the hardcore components you'll need to tear it up! Good luck.

TTOP350

iTrader: (8)

I ordered the Zpac for my last build but didnt put em in. We are trying somthing fun this go around. (im not a trans guy but I like to tear stuff up just to see if I can!)
From the short WOT blasts Ive done so far its shifting at wot and clutches are holding very well. Deeeep pan and modded pump(more vanes).

Pro Built Automatics

The 13 vane pump setup is not an improvement in a 700R4 without doing extensive work to the back half of the pump. Even then it only keeps the pressure smoother at low throttle openings, and does nothing for it at Hi-rpm.

TTOP350

iTrader: (8)

I know he did something else to the pump(im not sure what all) but b4 I was sucking a stock pan dry, Im guessing RPM/stock pan caused that.
She winds up waaay fast.
I may have to try one of your modded pumps!

project89

iTrader: (1)

4l80e was an idea i had, does ti bolt in or do u have to clearance the tunnel etc ?

if i can go that route without to much trouble id deff go 4l80e with a manual vb to eliminate the need for the ecm , over the 700r4

project89

iTrader: (1)

lmao yup thats how mine will be.mine is going to be my new daily driver except for really bad snow days up here ill take the truck out, anything under 3/4 inches ill prolly still drive the iroc lol