Help me fix my 4L60E!
Thread Starter
TECH Regular
Joined: Dec 2005
Posts: 444
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From: Kailua-Kona, HI
Help me fix my 4L60E! Ok so I have a 2000 SS Vert Clone mods in sig.
Trans is stock, 27k miles. Only mod to the trans is a derale deep sump pan with the cooling tubes and extra capacity.
I have only really ran a couple bottles of spray on the trans, 3 max.
Anyway, from a dead stop the trans does not seem to slip and shifts firmly at wot in all shifts. Lays the car out and all that.
If I run the car from a roll in 2nd, it slips somethin fierce.
If I am in Drive or Overdrive and floor it, at a speed where the trans kicks down into 2nd, it slips terribly bad.
Converter, everything is stock. 3.42 gears in the rear.
I'm about to throw a new set of heads on her that I have laying around- should get me up over 400rwhp n/a so I know I will need a re-tune, etc, so I figure now is the time to fix the trans too, and get a converter.
I want to get a stall, etc. but am wondering if this is possibly and easier fix than I might think so I can take care of it without pulling the trans.
Any ideas what causing this? I have a few of my own, but just want to throw it out there before I start spending money.
Thanks.
Trans is stock, 27k miles. Only mod to the trans is a derale deep sump pan with the cooling tubes and extra capacity.
I have only really ran a couple bottles of spray on the trans, 3 max.
Anyway, from a dead stop the trans does not seem to slip and shifts firmly at wot in all shifts. Lays the car out and all that.
If I run the car from a roll in 2nd, it slips somethin fierce.
If I am in Drive or Overdrive and floor it, at a speed where the trans kicks down into 2nd, it slips terribly bad.
Converter, everything is stock. 3.42 gears in the rear.
I'm about to throw a new set of heads on her that I have laying around- should get me up over 400rwhp n/a so I know I will need a re-tune, etc, so I figure now is the time to fix the trans too, and get a converter.
I want to get a stall, etc. but am wondering if this is possibly and easier fix than I might think so I can take care of it without pulling the trans.
Any ideas what causing this? I have a few of my own, but just want to throw it out there before I start spending money.
Thanks.
I would probably suspect either an issue with the band, forward clutch or possibly an input sprag that is starting to let go. The bad part is the trans would have to be removed to be repaired. You wold be looking at either a repair locally or purchasing a built unit. Vince
*Remove 4L60e
*Replace w/ 4L80e
Yes, its excessive but ultimately the trans is garbage for the power and weight that these cars have. Also this is setting up a excellent foundation for future HP and these transmissions are basically TH400 w/ Overdrive.
BUT in light of your current situation you COULD get away with a quality rebuild, but going to a person exp in this particular transmission is tough, I would say consult with some sponsors.
I will say for the milage, that I am suprised the trans is already taking a dump. Has the PCM tune been modified, or any Torque Management been removed?
*Replace w/ 4L80e
Yes, its excessive but ultimately the trans is garbage for the power and weight that these cars have. Also this is setting up a excellent foundation for future HP and these transmissions are basically TH400 w/ Overdrive.
BUT in light of your current situation you COULD get away with a quality rebuild, but going to a person exp in this particular transmission is tough, I would say consult with some sponsors.
I will say for the milage, that I am suprised the trans is already taking a dump. Has the PCM tune been modified, or any Torque Management been removed?
Teching In
Joined: Nov 2010
Posts: 1
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Pull it!!! To many sensors, relays and fuses!! I am so frustrated with this 4L60e!!! My '99 vette only has 73,000 miles on it, and I have all 3 books on the engine, trans, and wiring... Troubleshooting this tranny is an absolute waste of your sanity!!! Get a rebuilt one, cause at this rate one could go broke buying a new one, every 100,000 miles!!!!!
To many sensors, relays and fuses!! I am so frustrated with this 4L60e!!! My '99 vette only has 73,000 miles on it, and I have all 3 books on the engine, trans, and wiring... Troubleshooting this tranny is an absolute waste of your sanity!!! Get a rebuilt one, cause at this rate one could go broke buying a new one, every 100,000 miles!!!!!
Thread Starter
TECH Regular
Joined: Dec 2005
Posts: 444
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From: Kailua-Kona, HI
So can anyone give me a little more from a technical standpoint here?
I have no issues with taking the trans out, but I don't really want to go the route of buying a new unit, since I live in Hawaii and shipping is something else.
What would cause this? worn 2nd gear clutch pack? Why would it only slip at a low rpm in 2nd but not at high rpm like on the 1-2 shift? 1-2 shift is nice, firm, and sideways. I am assuming that the extra torque at low rpm is the cause.
A little help?
I have no issues with taking the trans out, but I don't really want to go the route of buying a new unit, since I live in Hawaii and shipping is something else.
What would cause this? worn 2nd gear clutch pack? Why would it only slip at a low rpm in 2nd but not at high rpm like on the 1-2 shift? 1-2 shift is nice, firm, and sideways. I am assuming that the extra torque at low rpm is the cause.
A little help?
Either way tranny needs to come out and the failure needs to be figured out.
Its absolute nonsense that the 4l60e cant take the power you are putting to it. A 4l80e is not needed. Im not against the 4l80e at all...it is a good tranny.
Build a 4L60E right and it will hold up.
Corvette servo...a must
Kevlar 2-4 band...a must
Valve body updates...a must
beast sunshell...a must
good quality proven clutch kit...a must
heavy duty sprag...a must
tranny cooler...a must
....low rpm....low line pressure....lower holding pressure to 2-4 band...
higher rpm....higher line pressure...higher holding pressure to 2-4....
Have a look see at your cooked 2-4 band
Drop the pan to see the dusting of 2-4 band laying in there.
Its absolute nonsense that the 4l60e cant take the power you are putting to it. A 4l80e is not needed. Im not against the 4l80e at all...it is a good tranny.
Build a 4L60E right and it will hold up.
Corvette servo...a must
Kevlar 2-4 band...a must
Valve body updates...a must
beast sunshell...a must
good quality proven clutch kit...a must
heavy duty sprag...a must
tranny cooler...a must
....low rpm....low line pressure....lower holding pressure to 2-4 band...
higher rpm....higher line pressure...higher holding pressure to 2-4....
Have a look see at your cooked 2-4 band
Drop the pan to see the dusting of 2-4 band laying in there.
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Launching!
Joined: Feb 2010
Posts: 237
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2nd gear is a band. And the servo applys it.Could be hard rubber,The over run drum some time concavs so there for the band cant hold the drum. Sound like hard rubber to me, Just age and heat do that, Or the valve body could be all gummed up. It has to be pulled out and tore down to diagnose.
I work @ a trans shop and I had a 408 sbc 3rd gen that i built along with a 700r4 that we built. My boss and i put a transgo shift kit in it the 160$ one. After that i would not do a full trottle upshift in to 3rd gear. The 1-2 was fine.
So I was getting beat @ the track cuz i had 2 lift so it would shift into 3rd lol.
So after pullin the valve body 4 times and one the phone with transgo countless times we could not figure it out.
So i trashed the valvebody and shift kit. Put another vb and a cheap *** b&m plate kit on it and it was fine,Just one of them things. All trannys have there problems and weak points is what im sayn. Your 4l60e will hold up fine built rite no need for a 4l80 for what your goal is. Im not too found of 4l80s lol
I work @ a trans shop and I had a 408 sbc 3rd gen that i built along with a 700r4 that we built. My boss and i put a transgo shift kit in it the 160$ one. After that i would not do a full trottle upshift in to 3rd gear. The 1-2 was fine.
So I was getting beat @ the track cuz i had 2 lift so it would shift into 3rd lol.
So after pullin the valve body 4 times and one the phone with transgo countless times we could not figure it out.
So i trashed the valvebody and shift kit. Put another vb and a cheap *** b&m plate kit on it and it was fine,Just one of them things. All trannys have there problems and weak points is what im sayn. Your 4l60e will hold up fine built rite no need for a 4l80 for what your goal is. Im not too found of 4l80s lol
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Thread Starter
TECH Regular
Joined: Dec 2005
Posts: 444
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From: Kailua-Kona, HI
So I think I'm just gonna get a used fully operational stock trans for now, that way I can still cruise the car while I figure out what I'm going to do.
For those of you who are saying that my trans should handle the power:
WTF?
Since when do stock 4L60E's handle 500 rwhp?
Since the last dyno, I changed the exhaust (was running a stock intermediate pipe) and installed a cutout- made a huge difference.
I have a set of cylinder heads and a bottle heater I am going to install too, so I plan on picking up another 60+ at the wheels.
So does anyone around here have a 4L60E that sucessfully handles 550rwhp+?
For those of you who are saying that my trans should handle the power:
WTF?
Since when do stock 4L60E's handle 500 rwhp?
Since the last dyno, I changed the exhaust (was running a stock intermediate pipe) and installed a cutout- made a huge difference.
I have a set of cylinder heads and a bottle heater I am going to install too, so I plan on picking up another 60+ at the wheels.
So does anyone around here have a 4L60E that sucessfully handles 550rwhp+?
I have a good built 4L60 with a 3200 stall that has under 1000 miles on it. It was built to support 600 rwhp. Its in michigan and I am looking to get 900.00 for it with the converter. Trans was 2500 new and converter was 795.00.
I am going FI with a turbo 400 or 4L80 with 900 RWHP
I am going FI with a turbo 400 or 4L80 with 900 RWHP
Thread Starter
TECH Regular
Joined: Dec 2005
Posts: 444
Likes: 0
From: Kailua-Kona, HI
I have a good built 4L60 with a 3200 stall that has under 1000 miles on it. It was built to support 600 rwhp. Its in michigan and I am looking to get 900.00 for it with the converter. Trans was 2500 new and converter was 795.00.
I am going FI with a turbo 400 or 4L80 with 900 RWHP
I am going FI with a turbo 400 or 4L80 with 900 RWHP
