6L80 Rebuild

[07Softail]

Has anyone ever had Circle D rebuild a transmission specifically the 6L80? I was quoted a price of $5000 plus the price of a $500 converter to me this sounds crazy as hell ! This is me taking it out and delivering it to them and would be a two week turnaround WTF are they really that good with these transmissions?

 

RT

[BBRU]

That sounds pretty high, probably paying a lot for the name.....

[silveradosid]

local shop that has been in business for 30 plus years charges 2500 if you deliver and 3500 in they do it all

[newdude]

Lots of special tool $$$$ to invest in these 6L transmissions...way more than a 4L60 or 80...

[transam69230]

Circle D is a top notch converter company from personal experience and many friends that have high horsepower LS powered cars. I am sure they know how to rebuild a transmission and from that price you must be getting some billet parts I would assume?

 

My 4L80E in in my racecar is probably $7,000 to $7,500 to build without a converter, but that includes a lot of billet pieces, a custom gear set, and other proprietary modifications done by the company that built it.

 

 

Long story short, are they capable yes, would I pay $5,000 grand for a stock rebuild? Absolutely not!!

[07Softail]

Lots of special tool $$$$ to invest in these 6L transmissions...way more than a 4L60 or 80...

The only tools I have seen on all of the Youtube videos are the giant snap ring pliers and a giant worm clamp to center the pump.

 

Circle D is a top notch converter company from personal experience and many friends that have high horsepower LS powered cars. I am sure they know how to rebuild a transmission and from that price you must be getting some billet parts I would assume?

 

My 4L80E in in my racecar is probably $7,000 to $7,500 to build without a converter, but that includes a lot of billet pieces, a custom gear set, and other proprietary modifications done by the company that built it.

 

 

Long story short, are they capable yes, would I pay $5,000 grand for a stock rebuild? Absolutely not!!

This is just a mild build up from stock street-strip so to speak. I did tell Patricia that this truck would not exceed 500HP at rear wheels with a future Magnacharger install, definitely not an all out race unit. None the less I won't be using them unless I win the lottery LOL. I think I will just do the Sonnax upgrades on the 1-2-3-4 piston, 3-4-5-R drum, 4-5-6 apply piston, Zip Kit, Tig weld the drums to the shafts and the pump slide spring basically $300 for parts. These items will do away with the 2-3 slip flare shift that these are notorious for and then the fast relearn for the TCM... Wish me luck

 

RT

[newdude]

The only tools I have seen on all of the Youtube videos are the giant snap ring pliers and a giant worm clamp to center the pump.

 

 

 

Seal protectors, seal installers, seal resizers, clutch compressor adapters, etc. https://gmtoolsandequipment.com/en-US/Pages/searchresults.aspx?search=6l80

[07Softail]

WOW... Ok thats is quite a bit of tools. I stand corrected but I did talk to a Builder today and his labor for 6L80's is $550 + my parts that includes installing new laminate disc on the solenoids and testing. Thanks 15HDriver

 

RT

[07Softail]

Upgrading the 6L80 with the Sonnax Upgrades does not need any special tools that I don't have. This will be a simple dis-assemble and replace of said parts above and some welding that I can do on the drums myself. I will be ordering parts in the near future and will document the install and pics will be added.

 

RT

[Willshire]

Please report back on how it goes! When you tig weld the drums do they need to be balanced?

[07Softail]

Please report back on how it goes! When you tig weld the drums do they need to be balanced?

I contacted Mike Kurtz @ Century Transmission about this and he said they haven't balanced them and didn't think they would need to be. Tig is more precise at making thin even welds. When I get done it will look like a continuous roll of nickles using my turntable. LOL!!

 

 

RT

[Willshire]

I suppose since the welds are close to the center so it won't affect rotating mass

 

 

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[HondaHawkGT]

I planned om doing the Sonnax uprades. The Circle D upgrade is aimed at guys that do a lot of racing. They basically turn the 6L80 into a 6L90 by the time they're done.

[07Softail]

I planned om doing the Sonnax uprades. The Circle D upgrade is aimed at guys that do a lot of racing. They basically turn the 6L80 into a 6L90 by the time they're done.

The parts i am ordering are as follows

1-2-3-4 piston

4-5-6 clutch apply piston

Line Booster valve

Zip Kit

Pump Slide spring

Switch repair kit if needed

ZR-1, CTSV Converter

 

And then re-tune from the stock calibrations the way i want it to feel

 

RT

[07Softail]

I finally received all of the build parts except the converter... Anyone know where I can get one on the cheap?

 

RT