LSX in a g-body, what trans?
Thread Starter
Teching In
Joined: Jan 2007
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LSX in a g-body, what trans? Well I'm in the planning stages of installing a lsx power plant in my 86 cutlass. And I am not quite sure what to do for a transmission. I would like to know what transmission you used in your swap and why you used it. How many people have used there 2004r in the swap?
I used the trans that I got with my LS1, a 4L60e. I used it cause
1. I had a th350 and an overdrive sounded nice
2. lower 1st gear
3. Cheaper to swap than a T-56
4. Newer tech (as opposed to a 700r4)
Lots of G-body's as of late.
1. I had a th350 and an overdrive sounded nice
2. lower 1st gear
3. Cheaper to swap than a T-56
4. Newer tech (as opposed to a 700r4)
Lots of G-body's as of late.
I'm using the built th400 trans that was already in my car before i bought my ls1. The car will mostly be used for street racing and street cruising...that's why i went with that trans. The 200r4 has already been done...you can use any gm tranny that you want to use (200r4, 700r4, 4l60e, 4l80e, th350, th400 etc...)!!! If you plan on having a highway car, and a car that will do great when racing i would go with a built 200r4.
I'm planning on using an LS1/2004R combo in my 85 SS. At least that's the plan.
What problems are you having running that combo? Does nobody make a VSS/cable box for that trans?
I'm only in the planning stages right now. My SS only has 41K on it and has quite a bit of life left in her
What problems are you having running that combo? Does nobody make a VSS/cable box for that trans?
I'm only in the planning stages right now. My SS only has 41K on it and has quite a bit of life left in her
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Verdad Gallardo I have a VSS on order from Jagsthatrun. It and my injectors should be here later this week and I'll be ready to start the car next weekend. Here is the post on the tv cable. https://ls1tech.com/forums/generation-iii-external-engine/791429-tv-cable-throttle-cable-bracket.html
I am using the one on page 16 at this link. http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf I haven't got my tuning right yet so I can't really tell you how good it's going to work. Learning how to tune is a PITA.
Teching In
Joined: Sep 2005
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From: Long Island, NY
Can the stock VSS from the original speedometer be used for the LS1 pcm? Isn't there a VSS on the back of the stock speedo that hooks to the stock ECM thats used for cruise control and probably other things?
In a G-body? I dont think so. in my 80 the cruise was vacuum operated, the speedo is mechanical. no electronic vss in a 80's era g-body.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
During the later years of the G-Body they had a VSS on the back of the speedo. I know my 85 had one, but I`m not sure what year it started, I`m guessing 82-83?
I don`t think that would interface very well with the LS1 PCM though, the LS1 uses a 40 pulse per revolution sensor on the trans output shaft. IIRC that ends up somewhere north of 100,000 pulses per mile with most tire sizes and gearing. The G-body sender was 2 pulse per revolution .... on the speedo. IIRC GM speedo cables turn 60 revolutions per mile so it would only be 120 pulses per mile.
I don`t think that would interface very well with the LS1 PCM though, the LS1 uses a 40 pulse per revolution sensor on the trans output shaft. IIRC that ends up somewhere north of 100,000 pulses per mile with most tire sizes and gearing. The G-body sender was 2 pulse per revolution .... on the speedo. IIRC GM speedo cables turn 60 revolutions per mile so it would only be 120 pulses per mile.
i have a 4l80e and i love it. just put it in, came with the motor and can use the stock PCM to control it. Plus i dont have to worry about it breaking. As a side note, only a .75 OD ratio is kinda a bummer, but since its so strong i am confident on it pulling a 3.08 gear for good criusing. I would suggest just getting a complete pullout and using the full harness and PCM capabilities.
Gary
Gary
Teching In
Joined: Sep 2005
Posts: 10
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From: Long Island, NY
My 84 SS must have a VSS because the cruise control appears to be electrically controlled. I found this in the Jags that Run VSS page:
a 40 tooth reluctor ring that is used on the trucks with electric speedometers,
and newer Camaros, Corvettes, and Caprices with the automatic transmission. It puts out 40 pulses per
driveshaft
revolution. With 4.11 gears and 25 inch diameter tires (an S-10 truck for example), this will put out about 133,000
pulses per mile. With 2.73 gears and 27 inch tires, this will put out about 82,000 pulses per mile.
With a 2000 pulse per mile signal (as used on earlier vehicles), a pulse is generated every 2.64 feet (31.7 inches), with
82,000 pulses per mile, a pulse is generated every 0.77 inches. This greater accuracy is required for the anti-lock
brakes, and to control the shifting of the electronic transmissions.
So I wonder if you were using lets say a 200-4R trans and no anti-lock brakes then the old style vss would work if it could be tuned somehow into the LS1 computer. Probably not, but it would be pretty cool if it did.
a 40 tooth reluctor ring that is used on the trucks with electric speedometers,
and newer Camaros, Corvettes, and Caprices with the automatic transmission. It puts out 40 pulses per
driveshaft
revolution. With 4.11 gears and 25 inch diameter tires (an S-10 truck for example), this will put out about 133,000
pulses per mile. With 2.73 gears and 27 inch tires, this will put out about 82,000 pulses per mile.
With a 2000 pulse per mile signal (as used on earlier vehicles), a pulse is generated every 2.64 feet (31.7 inches), with
82,000 pulses per mile, a pulse is generated every 0.77 inches. This greater accuracy is required for the anti-lock
brakes, and to control the shifting of the electronic transmissions.
So I wonder if you were using lets say a 200-4R trans and no anti-lock brakes then the old style vss would work if it could be tuned somehow into the LS1 computer. Probably not, but it would be pretty cool if it did.
Last edited by monteperformance; Dec 1, 2007 at 09:20 AM. Reason: typo
Teching In
Joined: Oct 2006
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i use a 4l60e because it came with the motor. and its a lot stronger than a 200r4. i also use Dakota Digital gauges. very easy to hook up and interface with lsx computer. my harness had all the connections pulled out so it was very easy hook-up. also their cruise control is electronic and uses the a stock style switch on the colomn.
My 84 SS must have a VSS because the cruise control appears to be electrically controlled. I found this in the Jags that Run VSS page:
a 40 tooth reluctor ring that is used on the trucks with electric speedometers,
and newer Camaros, Corvettes, and Caprices with the automatic transmission. It puts out 40 pulses per
driveshaft
revolution. With 4.11 gears and 25 inch diameter tires (an S-10 truck for example), this will put out about 133,000
pulses per mile. With 2.73 gears and 27 inch tires, this will put out about 82,000 pulses per mile.
With a 2000 pulse per mile signal (as used on earlier vehicles), a pulse is generated every 2.64 feet (31.7 inches), with
82,000 pulses per mile, a pulse is generated every 0.77 inches. This greater accuracy is required for the anti-lock
brakes, and to control the shifting of the electronic transmissions.
So I wonder if you were using lets say a 200-4R trans and no anti-lock brakes then the old style vss would work if it could be tuned somehow into the LS1 computer. Probably not, but it would be pretty cool if it did.
a 40 tooth reluctor ring that is used on the trucks with electric speedometers,
and newer Camaros, Corvettes, and Caprices with the automatic transmission. It puts out 40 pulses per
driveshaft
revolution. With 4.11 gears and 25 inch diameter tires (an S-10 truck for example), this will put out about 133,000
pulses per mile. With 2.73 gears and 27 inch tires, this will put out about 82,000 pulses per mile.
With a 2000 pulse per mile signal (as used on earlier vehicles), a pulse is generated every 2.64 feet (31.7 inches), with
82,000 pulses per mile, a pulse is generated every 0.77 inches. This greater accuracy is required for the anti-lock
brakes, and to control the shifting of the electronic transmissions.
So I wonder if you were using lets say a 200-4R trans and no anti-lock brakes then the old style vss would work if it could be tuned somehow into the LS1 computer. Probably not, but it would be pretty cool if it did.