Guess that broken part -- 4L60E -- no OD or D
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Guess that broken part -- 4L60E -- no OD or D
After letting my car sit in the garage for a month in disgust... I need to pull the trans again. I know it will be obvious when its pulled but i was wondering if someone might know just from this description....
Car is in OD... 25mph WOT down shift to first, tires spin and hook (315s), once it hits 2nd gear it felt like I broke my rear DS or axle. Engine RPM hit the roof and I backed off. This all happened in a split second.
After realizing my car still rolled without any noises, I proceeded to ease into the throttle.... no go... I put the trans in manual low and it works fine, 2nd gear works as well. If you put the selector in D or OD... it does not budge at any speed. Reverse is fine...
Any ideas to what went wrong?
Car is in OD... 25mph WOT down shift to first, tires spin and hook (315s), once it hits 2nd gear it felt like I broke my rear DS or axle. Engine RPM hit the roof and I backed off. This all happened in a split second.
After realizing my car still rolled without any noises, I proceeded to ease into the throttle.... no go... I put the trans in manual low and it works fine, 2nd gear works as well. If you put the selector in D or OD... it does not budge at any speed. Reverse is fine...
Any ideas to what went wrong?
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Well... I wasn't able to find any broken parts. However after checking the valves in the VB - I noticed that the 1-2 Accumulator Valve was stuck. What problems would that have caused?
The trans needed to be torn down again anyways for a new 3-4 clutchpack. They are burned again! Probably less than 300 miles. I think the 3-2 kickdown is what is killing them. There is a solid 1.5-2 second pause before the kickdown occurs. I don't think the 3-4 piston is releasing quick enough. I don't have upgraded 3-4 return springs. Does anyone think this may be my problem?
Again, thanks for everyones help!
David
The trans needed to be torn down again anyways for a new 3-4 clutchpack. They are burned again! Probably less than 300 miles. I think the 3-2 kickdown is what is killing them. There is a solid 1.5-2 second pause before the kickdown occurs. I don't think the 3-4 piston is releasing quick enough. I don't have upgraded 3-4 return springs. Does anyone think this may be my problem?
Again, thanks for everyones help!
David
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Originally Posted by jay_lt4
if you have the return springs installed, take them out,,
#14
It is not a double cage sprag. It is a stock type, non updated component.
Axiom pn A74658B is what you need. It is the heavy duty double cage sprag. Yours failed because it did not have the added support and the cams simply rolled over causing excessive pressure... then boom. The double caged sprag won't do that.
g
Axiom pn A74658B is what you need. It is the heavy duty double cage sprag. Yours failed because it did not have the added support and the cams simply rolled over causing excessive pressure... then boom. The double caged sprag won't do that.
g
#15
Axiom pn A74658B is what you need. It is the heavy duty double cage sprag. Yours failed because it did not have the added support and the cams simply rolled over causing excessive pressure... then boom. The double caged sprag won't do that.
The cage keeps the elements in place nothing more, and it does not offer support. You can collapse these cages with your hand. I have seen both blow up/roll over. I have found that the SKF to be in the vast majority of GM units and do very well, and have seen them go for well over 200,000 miles. I prefer and use the SKF's in all of my builds. Is one superior over the other?, or is one stronger than the other? Not from my experience, but each has his reasons for using either the BW or SKF. With the sprag that is the subject here, you will need to replace the entire input assembly. Check the lube circuit carefully.
The cage keeps the elements in place nothing more, and it does not offer support. You can collapse these cages with your hand. I have seen both blow up/roll over. I have found that the SKF to be in the vast majority of GM units and do very well, and have seen them go for well over 200,000 miles. I prefer and use the SKF's in all of my builds. Is one superior over the other?, or is one stronger than the other? Not from my experience, but each has his reasons for using either the BW or SKF. With the sprag that is the subject here, you will need to replace the entire input assembly. Check the lube circuit carefully.
Last edited by PBA; 08-26-2007 at 03:04 AM.
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Originally Posted by PBA
Axiom pn A74658B is what you need. It is the heavy duty double cage sprag. Yours failed because it did not have the added support and the cams simply rolled over causing excessive pressure... then boom. The double caged sprag won't do that.
The cage keeps the elements in place nothing more, and it does not offer support. You can collapse these cages with your hand. I have seen both blow up/roll over. I have found that the SKF to be in the vast majority of GM units and do very well, and have seen them go for well over 200,000 miles. I prefer and use the SKF's in all of my builds. Is one superior over the other?, or is one stronger than the other? Not from my experience, but each has his reasons for using either the BW or SKF. With the sprag that is the subject here, you will need to replace the entire input assembly. Check the lube circuit carefully.
The cage keeps the elements in place nothing more, and it does not offer support. You can collapse these cages with your hand. I have seen both blow up/roll over. I have found that the SKF to be in the vast majority of GM units and do very well, and have seen them go for well over 200,000 miles. I prefer and use the SKF's in all of my builds. Is one superior over the other?, or is one stronger than the other? Not from my experience, but each has his reasons for using either the BW or SKF. With the sprag that is the subject here, you will need to replace the entire input assembly. Check the lube circuit carefully.
#18
I guess that is where we differ, as I do not have sprag failures using the SKF's, believe me if I did I would change it. By the way I am not a fan of Raybestos products, as this is the only Raybestos product that I use that I aware of, otherwise I am a big user of Borg Warner clutches, band material, etc. I have always believed that what ever works best (from my experience) is to use it.
"3-4 is burning up partially due to the use of the old style 700R4 pressure plate thats paper thin."
I have not seen this, as I have used the .125" pressure plate with the .055" five finger 3-4 apply retainer in many units over the years. There many reasons for the 3-4 clutch to burn, but from my experience this is not one of them.
"3-4 is burning up partially due to the use of the old style 700R4 pressure plate thats paper thin."
I have not seen this, as I have used the .125" pressure plate with the .055" five finger 3-4 apply retainer in many units over the years. There many reasons for the 3-4 clutch to burn, but from my experience this is not one of them.
Last edited by PBA; 08-27-2007 at 03:07 AM.