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Old 09-05-2007, 12:36 PM
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4L60E problems.

Hi guys got a bit of a problem.
Ihave a 4L60E nightmare. Ihave rebuilt the entire insides, also put a transgo shift kit in, and am running a 2200 stall converter. The problem is it works fantastic for a couple days and then 3rd gear hold down ring lets loose and there goes third gear and the entire tranny quits and rolls to the side of the road. Ihave taken this one out 5 times and gone over everything . any ideas what Im missing.
Thanks

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Old 09-05-2007, 02:58 PM
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i hope this info helps.

http://www.duramaxperformancechip.co...pic.php?t=6079
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Old 09-05-2007, 07:14 PM
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souds to me that you may be either using the wrong snapring or the lugs on the input drum are worn out or broken are you using the stock snapring or an aftermarket thinner one to get more clutches in
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Old 09-06-2007, 07:56 AM
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burninrubber

Iput a new drum in, the lugs are mint.It is an oem snap ring. Iwas thinking maybe the tolerances are to close . I usually go between .060-.080. It is a six pack clutch set up. I will check the snap ring in comparison to the old one maybe your right it might be a different thickness.
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Old 09-06-2007, 12:32 PM
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4L60e

Is this the original snap ring and were the 3-4 clutchs burned badly from the first trans failure?

If so the snap ring may have lost tension, lost it;s "spring", if you will.

This would cause the snap ring to become too small in the snap ring grooves and prone to popping out of the grooves in the input drum.
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Old 09-06-2007, 01:02 PM
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burninrubber

Thanks briscoe actually the clutches never where burned out we just decided to do a build up with this unit. Iwill check it though after all anything man made is prone to failure.
Thanks again
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Old 09-06-2007, 03:36 PM
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4l60e

Yeah, let us know please, as this is not a common problem, unless, there is a problem with either the input drum lugs or the snap ring itself.
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Old 09-06-2007, 06:24 PM
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if you are setting the clearnce to ..060 -.080 there is your problem what id happening is the piston is coming out of its bore and cocking the pack and kicking the snap ring out the clearnce shoild be around .030
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Old 09-07-2007, 08:10 AM
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4L60e

Perfomabuilt2, I must respectfully disagree with your theory.

How many units come in for a rebuild with much more than .080 clearance in the 3-4 clutchs, with the snap ring still intact? The answer is, alot.

The 3-4 piston is over .400 thick. How is .040 or .050 excessive clearance going to cause this failure? Coming out of the bore? No.

Just my opinion.

Burninrubber, I don't know how many of these units you have been into before but, you may want to consider taking your input drum, complete, to a trans shop. Let them look at it and see if they can tell what is happening.
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Old 09-07-2007, 08:53 AM
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yes .060 to 80 is stock however if he is using an aggressive shift kit with higher line the you have time/force/distance= impact kinda like a hammer on the snap ring......set the clearnace at .030 and I bet that the snap ring doesnt come out again and you will also get a much quiker 2-3 shift
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Old 09-07-2007, 08:57 AM
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burninrubber

Thanks briscoe Ijustr did exactly that, I just got back from dropping it off. They did a quick check for me and the tolerances are ok. They are going to try a spiral type ring that apparently holds much tighter.
I will keep you posted on this.
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Old 09-07-2007, 09:14 AM
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burninrubber

Thanks performabuilt I just called the tranny shop and told them what you said and they are going to check this out again.
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Old 09-07-2007, 10:26 AM
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4l60e

We also keep our 3-4 clearances tight as well performabuilt2, and we'll hope that this will take care of it.
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Old 09-07-2007, 07:21 PM
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I've run the 3-4 clutch pack at .045 to .070 for decades. Seldom a problem.

If you run at higher RPMs like say 6k or higher , with the 3-4 clutch pack near .030 I have seen some mild friction plate burning in some units.
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