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4L80E Hard Shifting

4L80E Hard Shifting

Postby chevyripper [OP] » Jan 25 2012, 6:52am

Hi, I have a 1992 silverado with a 4L80E trans. the trans only has around 35k miles on it but lately it seems like it shifts as though it has a shift kit. I was wondering if this is a bad thing and I should look into it or what could be wrong
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Re: 4L80E Hard Shifting

Postby EX-F150 owner » Jan 25 2012, 6:27pm

I had a 2002 Bonneville that did this and it had a bad Pressure Control Solenoid (PSC) that was causing it. When it went bad it did as you're describing by forcing full line pressure when shifting. I doubt this is good for it, if this is your issue.
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Re: 4L80E Hard Shifting

Postby starspangled6.0 » Jan 25 2012, 6:38pm

It might be slipping. Have you dropped the pan to check for any particles?
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04 Silverado 2500HD 6.6L Extended Cab w\Hiniker 8.5 V
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Re: 4L80E Hard Shifting

Postby chevyripper [OP] » Jan 25 2012, 6:50pm

No i haven't dropped the pan but i plan on doing a flush so I can check then. The trans only has 35k miles on it so I doubt it would be slipping already though. at least I hope not!
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Re: 4L80E Hard Shifting

Postby starspangled6.0 » Jan 25 2012, 6:54pm

That's true. Those are supposed to be one of GM's best transmissions ever built, especially the newer ones. Let us know how it goes!
07 Silverado 3500HD 6.6L Crew Cab Dually
04 Silverado 2500HD 6.6L Extended Cab w\Hiniker 8.5 V
03 Sierra 2500HD 6.0L Extended Cab w\BOSS 8.2' V


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Re: 4L80E Hard Shifting

Postby chevyripper [OP] » Jan 26 2012, 4:37am

It doesnt shift that hard really though its kind of just shifting more like it has a firm shift kit installed. Im hoping it isnt anything major
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Re: 4L80E Hard Shifting

Postby starspangled6.0 » Jan 26 2012, 4:39am

Does it shift different when cold or when warmed up?
07 Silverado 3500HD 6.6L Crew Cab Dually
04 Silverado 2500HD 6.6L Extended Cab w\Hiniker 8.5 V
03 Sierra 2500HD 6.0L Extended Cab w\BOSS 8.2' V


http://www.integrityoutdoor.biz
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Shifting into Sixth Gear! [L3]
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Re: 4L80E Hard Shifting

Postby chevyripper [OP] » Jan 26 2012, 5:15pm

Im actually not sure Ill have to see. Im pretty sure it always shifts firm. but it seems like the 1st to 2nd gear shift is by far the firmest. the other ones are pretty normal
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