How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
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Joined: Nov 2001
Posts: 70
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From: Edmonton,Alberta,Canada
How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
I've been doing a bunch of research on this,reading various threads here as well as on 700r4l60.com etc,but haven't been able to come up with a definitive solution that will work.
The car is an '89 IROC originally had a 5.7, now I am putting in a 421 c.i. as well as installing that kit from EFI connection which changes it to run on a 2001-2002 LS2 PCM,coil on plug ignition etc. The new PCM does not control lock up.
I have looked at various kits...Painless,B&M,TCI however, they all seem to say that they only lock up the converter in 4th gear.I rarely use 4th gear, only on the highway to the race track or the freeways in town.It would lock up around 60 km/h (40 mph) in 3rd gear at cruise or light throttle.I would like it to operate just like oem factory & lock up in 3rd & 4th gears.It has a 2800 stall TCS Prolocker converter & 3:54 rear gears.
I've read some stuff about using a GM vacuum switch & connector PN 14014519 & 1210266.I work at a GM dealer & found that these are no longer available.
Just looking for a solution that works for sure & is seamless just like factory.I don't want a manual switch that I have to flip on & off all the time.If somebody has a wiring diagram that works that would be great as well.
Thanks for any input!
The car is an '89 IROC originally had a 5.7, now I am putting in a 421 c.i. as well as installing that kit from EFI connection which changes it to run on a 2001-2002 LS2 PCM,coil on plug ignition etc. The new PCM does not control lock up.
I have looked at various kits...Painless,B&M,TCI however, they all seem to say that they only lock up the converter in 4th gear.I rarely use 4th gear, only on the highway to the race track or the freeways in town.It would lock up around 60 km/h (40 mph) in 3rd gear at cruise or light throttle.I would like it to operate just like oem factory & lock up in 3rd & 4th gears.It has a 2800 stall TCS Prolocker converter & 3:54 rear gears.
I've read some stuff about using a GM vacuum switch & connector PN 14014519 & 1210266.I work at a GM dealer & found that these are no longer available.
Just looking for a solution that works for sure & is seamless just like factory.I don't want a manual switch that I have to flip on & off all the time.If somebody has a wiring diagram that works that would be great as well.
Thanks for any input!
Member
Joined: Dec 2002
Posts: 373
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From: Brooklyn, MI
Car: 1991 Camaro RS
Engine: 355
Transmission: 700-R4
Axle/Gears: 4.10
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
I was unaware that the converter locked up in 3rd. You're in 3rd @ 40mph? I'm learning all kinds of new stuff today. 
Thread Starter
Junior Member
Joined: Nov 2001
Posts: 70
Likes: 0
From: Edmonton,Alberta,Canada
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
Yes,under very light throttle steady cruise it locks around 40mph in 3rd.The car originally came with 2:77 gears but now has 3:54 with the original governor,which accounts for slightly early shifts under light throttle,"normal" driving.I just want the lock up to work like factory.
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Joined: Apr 2007
Posts: 1,196
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From: BUFFALO, NY
Car: '89 IROC-Z
Engine: 355
Transmission: 700r4 edge 3000 stall
Axle/Gears: 9-bolt 3.73
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
When i converted to carb, mine kept locking up around town when I didn't want it to, I wired a toggle to the brake switch so I only turn it on when im on the thruway.
Thread Starter
Junior Member
Joined: Nov 2001
Posts: 70
Likes: 0
From: Edmonton,Alberta,Canada
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
TTT ...anybody used any of those kits? I'm leaning toward the TCI one??
Thanks for any advice
Thanks for any advice
Joined: Dec 2004
Posts: 2,042
Likes: 18
From: Lincolnton, NC
Car: 88 IROC
Engine: 97 5.7 Vortec LT4 hotcam
Transmission: 700 r4
Axle/Gears: 3.73
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
Member
Joined: Sep 2007
Posts: 449
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From: RHODE ISLAND
Car: 1988 iroc-z
Engine: 350 Vortec TPI
Transmission: 700r4
Axle/Gears: 3.73 4th gen Torsen 10bolt
Re: How do you get a 700r4 to lock up just like factory when the oem ecm is gone?
http://www.larryselectricsite.com/700r4.html
ive used a few of there harnesses,great people to deal with.
ive used a few of there harnesses,great people to deal with.
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