Posted a while back on this. Trans is in.... converter built... driveshaft cut and re- balanced.... Hurst quarter stick in. That was the easy part. As far as the electronics went, i had to pull the TCM out of the factory trans and mount it external plugged in. Could not fool the system any other way. Everything works on the GM lan data system and windows.. radio.. heater... cluster... all were inop with it unplugged. So far so good. Gonna have the tuning done soon and hope for the best. Thought id share and hopefully make your project simpler than mine was.

 

y would u change the trans? whats wrong with having a 6 speed??

 

probally wants more of a drag car, also having that 6spd build would probally cost at least double what a th400 built for 1000hp would cost

 

Exactly. Cheaper to build and a lot of experience out there with the TH 400... rather than only a handfull of people that can build the 6L80 to hold up as good. Got about 400 miles on the install . Happy with it so far. Lost some low end but that was expected... thinking the 410 gear could solve that.

 

ya i went from a fast 90/90 and 3.23 gear to a fast 102/102 4.10 and it woke it up for sure and mine was only a big cam only ls1 not a bad *** 6.2 or whatever you got

 

Waiting on the tune.... been spraying it with a 150 shot. Gonna come up to a 175 after the tune. Going to a plate system also. Hoping for some low 11's without the gear. anxious to see the outcome.

 

all you had to do was jump the can lines, pin 10 to 14 and 11 to 13 to complete the can data circuit:

 

Tried that. Then i ran into problems with the PRNDL. Need park or neutral to start... then need drive for the tune to work... otherwise it would hit the limiter at 5000 RPM instead of the programed 6900 RPM and would run in a limp mode... lower power.. acted like the timing was off. So far moving the PRNDL by hand into drive works till i find a better idea. ????????

 

jump the can lines and program your ecm with a ls3 file, then turn off all the starter enable checks in the tune

 

I went with the 4L80E in mine. Also since it was a Stick car I didn't have a lot of problems with the tune or ECU. Also I used a 2.75 first gear and the stock 3.45 rear gear.

So far my best 60' on radials has been a 1.56.

Robin

 

I used to rebuild TH400 trans in the late 1970s.... basically bullet proof 3-speed that can handle tons of power...

 

why not just load a Manual ls3 camaro operating system?

 

you would still need to jump the can data lines at the tcm connector to complete the data circuit

 

thats fine, but at least that way you wouldnt have the PCM looking for the TCM

 

Do you have gm global connect access?

edward.coss@gmail.com

 

yes i do

 

....uuuhh wow....You guys sure know how to take a modern hotrod and step it back inn time 40 years.

 

Do we have an update on this car? How is it functioning? What was done in the ecu to allow for the car to start up etc. How about a speed signal to the speedometer, is the speedo working or no? I have a turbo400 in my G8 right now, but we havent dug into the getting the car to run yet. So any tips would be great.

 

you must have crazy room in the tunnel
with that big *** tranny gone now.

now if only we can get your 6 speed auto
to work with out all the computer stuff.

 

That tranny weighs around 220 lbs. the turbo400 is like 120 with all of the lightened internals.