Another 4l60e bites it

[Kv5137kv5137]

Project. 96 Tahoe. Got it for a good price. Tranny wouldn’t grab 3rd gear. Gave code p1870.. 1 and two are good No 3rd. ****** me off just bought tires.. did whole front end and bam. Lasted two days lol


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[df2x4]

Smoked the frictions in 3rd, I'm sure. Been there and done that twice in my red (V6) truck. 4L80E swap has fixed that, hopefully permanently!

 

[Kv5137kv5137]

Also got code p0141. O2 sensor.. wondering ... I had a maf sensor code previously which I cleared out. And researching found that the maf,o2 and tranny share same fuse ... have to check that out. Left it at friends garage


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[Supercharged111]

Isn't the 3-4 clutch pack up front right behind the pump? If so you could really halfass a rebuild and just slap new 3-4 clutches in there and send it.

 

[Kv5137kv5137]

Never done a transmission. Would love to try one. You tube videos seem simple enough. But alas time is not on my side


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[RDF1]

Never done a transmission. Would love to try one. You tube videos seem simple enough. But alas time is not on my side


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4L60E is pretty simply to rebuild. We have done several with just a Banner kit and all but one has lasted a few years. One that died was on a GTO and he sprayed a 300 with a slick...
Clutches are easy to replace.

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[likestrucks]

The 3-4 clutch pack is the failure point, but you have to figure out why it failed. Most of the time 3-4 clutch pack failure is a result of a worn 3-4 piston. When the 3-4 piston starts to fail, adequate pressure cannot be applied to the 3-4 clutch pack resulting in clutch failure. This shows why its necessary to not just replace what failed but also determine the cause. That's why reputable shops always do a complete teardown.

 

[Supercharged111]

The 3-4 clutch pack is the failure point, but you have to figure out why it failed. Most of the time 3-4 clutch pack failure is a result of a worn 3-4 piston. When the 3-4 piston starts to fail, adequate pressure cannot be applied to the 3-4 clutch pack resulting in clutch failure. This shows why its necessary to not just replace what failed but also determine the cause. That's why reputable shops always do a complete teardown.

OK so shift kit, 3-4 pack, and send it.

 

[RDF1]

Majority of the 3-4 clutch pack failures we have seen were from constant 4-3 down shifts and 3-4 upshifts

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[Supercharged111]

Majority of the 3-4 clutch pack failures we have seen were from constant 4-3 down shifts and 3-4 upshifts

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Curious how you came to that conclusion? The way I understand it, the 3-4 pack stays engaged in both and the band comes on in 3rd to make OD happen. Unsure if that overruns something or if something must disengage to engage 4th.