1994 Automatic 4L60E
Thread Starter
Teching In
Joined: Sep 2006
Posts: 5
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1994 Automatic 4L60E Hi everybody I'm new here. I've searched Google and here and I can't seem to find somebody with the same trans issue.
First the background: 94 Z28, 54,043 Miles. The guy I bought it from didn't test drive it due to weather. When he does drive it home he gets on the highway and he said the trans was slipping. So he takes it to a trans shop and has the following done (he gave me the invoice) from the invoice: Transmission rebuilt, stage 1 shift kit, Corvette servo, 6 clutch plates and upgraded solenoids.
Now I buy the car with 55,200 miles on it and it drives perfect..... Until I floor it from random cruising speeds including 70-75 mph on the highway. Intermittently it acts like it goes to neutral and just pegs the rev limiter. Other times under the exact same conditions it performs the kickdown properly! I am stumped.
The trans was done in Sept 2013!
Fluid is up and clean no engine light on the dash and always shifts properly just driving the car regular.
So I'm leaning towards the rebuild didn't address the problem at all?
Thank you in advance for any insight or suggestions.
First the background: 94 Z28, 54,043 Miles. The guy I bought it from didn't test drive it due to weather. When he does drive it home he gets on the highway and he said the trans was slipping. So he takes it to a trans shop and has the following done (he gave me the invoice) from the invoice: Transmission rebuilt, stage 1 shift kit, Corvette servo, 6 clutch plates and upgraded solenoids.
Now I buy the car with 55,200 miles on it and it drives perfect..... Until I floor it from random cruising speeds including 70-75 mph on the highway. Intermittently it acts like it goes to neutral and just pegs the rev limiter. Other times under the exact same conditions it performs the kickdown properly! I am stumped.
The trans was done in Sept 2013!
Fluid is up and clean no engine light on the dash and always shifts properly just driving the car regular.
So I'm leaning towards the rebuild didn't address the problem at all?
Thank you in advance for any insight or suggestions.
Teching In
Joined: Nov 2011
Posts: 18
Likes: 0
Hi everybody I'm new here. I've searched Google and here and I can't seem to find somebody with the same trans issue.
First the background: 94 Z28, 54,043 Miles. The guy I bought it from didn't test drive it due to weather. When he does drive it home he gets on the highway and he said the trans was slipping. So he takes it to a trans shop and has the following done (he gave me the invoice) from the invoice: Transmission rebuilt, stage 1 shift kit, Corvette servo, 6 clutch plates and upgraded solenoids.
Now I buy the car with 55,200 miles on it and it drives perfect..... Until I floor it from random cruising speeds including 70-75 mph on the highway. Intermittently it acts like it goes to neutral and just pegs the rev limiter. Other times under the exact same conditions it performs the kickdown properly! I am stumped.
The trans was done in Sept 2013!
Fluid is up and clean no engine light on the dash and always shifts properly just driving the car regular.
So I'm leaning towards the rebuild didn't address the problem at all?
Thank you in advance for any insight or suggestions.
First the background: 94 Z28, 54,043 Miles. The guy I bought it from didn't test drive it due to weather. When he does drive it home he gets on the highway and he said the trans was slipping. So he takes it to a trans shop and has the following done (he gave me the invoice) from the invoice: Transmission rebuilt, stage 1 shift kit, Corvette servo, 6 clutch plates and upgraded solenoids.
Now I buy the car with 55,200 miles on it and it drives perfect..... Until I floor it from random cruising speeds including 70-75 mph on the highway. Intermittently it acts like it goes to neutral and just pegs the rev limiter. Other times under the exact same conditions it performs the kickdown properly! I am stumped.
The trans was done in Sept 2013!
Fluid is up and clean no engine light on the dash and always shifts properly just driving the car regular.
So I'm leaning towards the rebuild didn't address the problem at all?
Thank you in advance for any insight or suggestions.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
If the 1/2 quart overfill doesn't work, try to determine if it is slipping in all gears or only e.g. 3rd gear.
We've had a few cases of the forward sprag slipping, but usually it just breaks and then you have no forward motion in [D3] or [OD].
Slipping in 3rd gear is the most common complaint mentioned here.
We've had a few cases of the forward sprag slipping, but usually it just breaks and then you have no forward motion in [D3] or [OD].
Slipping in 3rd gear is the most common complaint mentioned here.
Thread Starter
Teching In
Joined: Sep 2006
Posts: 5
Likes: 0
If the 1/2 quart overfill doesn't work, try to determine if it is slipping in all gears or only e.g. 3rd gear.
We've had a few cases of the forward sprag slipping, but usually it just breaks and then you have no forward motion in [D3] or [OD].
Slipping in 3rd gear is the most common complaint mentioned here.
We've had a few cases of the forward sprag slipping, but usually it just breaks and then you have no forward motion in [D3] or [OD].
Slipping in 3rd gear is the most common complaint mentioned here.
I do appreciate the help, I will follow up once I decide on a trans shop, I'm a little leery of going back to the shop that already did it once!
Teching In
Joined: Feb 2014
Posts: 27
Likes: 0
Years ago when I worked at a Chevy dealership and the 700R4 was a couple of years old this issue occurred.The customers complaint was when trying to pass another vehicle at wot, the transmission would go into neutral.
After disassembling the unit, I found that the reverse input drum was flared out so bad it was cutting into the transmission case. The forward sprag would hold by hand, and when normal driving. I'm sure 700R4 and 4L60E builders have seen this happen many times.
After disassembling the unit, I found that the reverse input drum was flared out so bad it was cutting into the transmission case. The forward sprag would hold by hand, and when normal driving. I'm sure 700R4 and 4L60E builders have seen this happen many times.
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Thread Starter
Teching In
Joined: Sep 2006
Posts: 5
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Years ago when I worked at a Chevy dealership and the 700R4 was a couple of years old this issue occurred.The customers complaint was when trying to pass another vehicle at wot, the transmission would go into neutral.
After disassembling the unit, I found that the reverse input drum was flared out so bad it was cutting into the transmission case. The forward sprag would hold by hand, and when normal driving. I'm sure 700R4 and 4L60E builders have seen this happen many times.
After disassembling the unit, I found that the reverse input drum was flared out so bad it was cutting into the transmission case. The forward sprag would hold by hand, and when normal driving. I'm sure 700R4 and 4L60E builders have seen this happen many times.
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Verdad Gallardo Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Give us more info about what gears slip and we will go from there.
Thread Starter
Teching In
Joined: Sep 2006
Posts: 5
Likes: 0
So far your issue does not sound like a problem with either the input drum or the reverse drum. The input drum is rarely replaced during a rebuild as it is not a wear item. The reverse drum is sometimes replaced because the band wears against it.
Give us more info about what gears slip and we will go from there.
Give us more info about what gears slip and we will go from there.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Hooking with the trans builder is a good plan.
Presumably he will connect a scanner and a pressure gauge and take it for a test drive.
It is hard to diagnose these problems from just a description.
Presumably he will connect a scanner and a pressure gauge and take it for a test drive.
It is hard to diagnose these problems from just a description.