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06 Sierra Tranny Question

Silver Hawk

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Silver Hawk Enthusiast

Silver Hawk

Posted
Posted

Dad's got an 06 Sierra CCSB 1500 with a 5.3. We just ordered a procharger supercharger for it and was wondering if the tranny will hold under the new power? Who makes the best after market tranny for the 1500s?

 

Thanks in advance

-Sal

redvett Senior Enthusiast

redvett

Posted
Posted

If you are getting a supercharger package you should be getting a programmer for the changes & that will change the shifting of the transmission. As for the transmission holding up its a 4L65E and is heavier duty than the 4L60E. Just wait until its dead and have the sun gears & drum replaced with aftermarket HD parts.

cmoore74 Enthusiast

cmoore74

Posted
Posted
As for the transmission holding up its a 4L65E and is heavier duty than the 4L60E.

 

It is? I have the same truck and I always thought it was a 4L60E. Not arguing, just saying that is news to me. Is there an RPO code that indicates which tranny?

cmoore74 Enthusiast

cmoore74

Posted
Posted
As for the transmission holding up its a 4L65E and is heavier duty than the 4L60E.

 

It is? I have the same truck and I always thought it was a 4L60E. Not arguing, just saying that is news to me. Is there an RPO code that indicates which tranny?

 

 

OK, I think I found the RPO codes:

 

4L60E RPO M30

4L65E RPO M32

 

I used the RPO look-up function here, but it gave info for both trannys under the same code. A little more searching makes me believe the 5.3L has the 4L60E while the 6.0L has the 4L65E. I'll check my truck and report back.

redvett Senior Enthusiast

redvett

Posted
Posted

I made a mistake and thought the truck was a GMT900 which is supposed to have a 4L65E in them on all engines.

But still in all i would not change the trans until it pukes and them get it rebuilt with HP parts. I have a friend that has a 2000 C5 Corvette with a 4L60E and its got a warmed over 5.7L with a supercharger and it lasted 3 years worth of hard drag racing. He then had trans built & no problems since.

Silver Hawk Enthusiast

Silver Hawk

Posted
  • Author
Posted

What will the transmission do if too much power is applied? I know the allison will go into "limp" mode which will not allow the truck to go above 30mph. Will this one do the same?

Bish Senior Enthusiast

Bish

Posted
Posted
What will the transmission do if too much power is applied? I know the allison will go into "limp" mode which will not allow the truck to go above 30mph. Will this one do the same?

 

Without a tune, "abuse mode" will kick in via Torque Management and the computer will retard timing to reduce engine power. TM is most noticeable right after the 1-2 shift where it will bog badly for a second or two then return to normal power.

 

I would guess your trans will break at some point if you drive it hard with the blower...probably sooner if you beat it. When it goes, it will leave you stranded most likely. . Once it blows, definitely consider Finish Line Transmission. I have one of theirs and they build awesome trannies and they stand behind them.

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