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4L60e problems

4L60e problems

Postby hetzelmr [OP] » Oct 27 2011, 5:44am

Ok, thought I would post this because I am having an issue with my tranny.

I have an 08 Sierra with a 4.3 and a 4L60e. I noticed that when I'm in 4th gear and going uphil and under 2k RPMs the truck will chugg and surge untill it upshifts to third. I ran it today above 2k RPMs in 4th, no problems.

So going uphill in 4th between 1500 and 1800 RPMs theres a problem, any ideas??

I've also noticed this problem on other GM cars as well
[i]08 Sierra, 4.3 bone stock

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Re: 4L60e problems

Postby ASTE25 » Oct 27 2011, 6:00am

Sounds like the transmission is not the problem. I think you are lugging the engine at that rpm going up a hill. The 4.3 is an excellent engine, but it's a little bit underpowered for doing that. Try giving it more gas so it will downshift sooner.
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Re: 4L60e problems

Postby Z15 » Oct 27 2011, 11:39am

You might want to run this past your dealer as there may be a ECM software update to change the shift parameters so it shifts into 4th gear at higher rpm.
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Re: 4L60e problems

Postby hetzelmr [OP] » Oct 27 2011, 2:58pm

Could this be a gearing problem?? I'm not sure what the final ratio is but this truck does have 20 inchers on.
[i]08 Sierra, 4.3 bone stock

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Re: 4L60e problems

Postby Z15 » Oct 27 2011, 3:24pm

20 inchers on


This could possibly be the problem. When you put different size tires on the truck you change the final drive ratio and also change the RPM at which the transmission shifts. In other words, you can under-power the truck with bigger tires, not to mention the extra weight of the tires.

If someone put that size on it could be the problem. I would look on the door for the correct size and then compare to whats on the truck now. When the GM dealer installs factory approved 20 inch tires they reprogram the ECM for those tires but if the previous owner never had that done then the ECM is still running like it had the OEM tires.

Oversize tires may look good but they sometimes cause problems with trans shift points, speed reading off etc. The larger the diameter from stock, the higher the gear ratio and too high will only cause the vehicle to be operating outside of its designed torque range.
Last edited by Z15 on Oct 27 2011, 3:35pm, edited 1 time in total.
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Re: 4L60e problems

Postby hetzelmr [OP] » Oct 27 2011, 3:30pm

Thanks everyone for your input, I'll get to work and see what size tires the truck came with stock as it came with the 20s when I bought it.
[i]08 Sierra, 4.3 bone stock

Once you have experienced flight, you will forever walk the Earth with your eyes turned skyward. For there you have been, and there you long to return.
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Re: 4L60e problems

Postby hetzelmr [OP] » Oct 27 2011, 5:26pm

Yep, checked the door sticker and 17 inch wheels is what it read. Now I need to find some wheels and tires.
Thanks all.

I'll let you guys know if that makes the difference here.
[i]08 Sierra, 4.3 bone stock

Once you have experienced flight, you will forever walk the Earth with your eyes turned skyward. For there you have been, and there you long to return.
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Re: 4L60e problems

Postby wild.irish » Oct 27 2011, 6:00pm

It could also be a fuel pump. Your truck is '08 though, so not very likely, but if no other advise helps, check fuel pump for performance. I had the same behavior on my '98 (10 years older!), though the fuel pump on it was just 2 years old. thought it was a tranny, had it checked - ended up being a fuel pump underperforming. replaced it, and it was like new!
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