Transmission shop recommendations in Minneapolis?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
Anybody know of a dependable transmission shop in the Minneapolis, MN area? I need my 6L80 torn into and I have not had a lot of luck in the past with transmission shops.

My '06 Yukon got stolen in February right out of my driveway. The insurance company totaled it pretty quickly and that's when I found out that the minute they decided to total it I didn't have a rental car. That made it difficult to go out truck shopping. I had held off truck shopping because I really wanted my Denali back and thought it would turn up (it, or most of it, eventually did turn up). Now I had to act a little faster than expected. I came across a nearby dealership with a 2011 Suburban LTZ that appeared to be reasonably clean for a Minnesota truck. It had a little over 200,000 miles so I was a bit careful because I knew that the 6L80 transmissions have issues and this had a lag in the down shift. I took it to a mechanic for a prepurchase check out and specifically asked for an opinion on the health of the transmission. Two of the mechanics at the shop had Suburbans and experience with their issues. They didn't think the issue was serious but, of course, explained that there were no guarantees. They thought this was a great deal. By the time I brought it back to the dealership it was running and shifting fine. I figured a filter and fluid change was due. You can probably see where this is going.

We made the the deal (AS IS because of the age and mileage). Drove it home, drove it to work, and then everything went to heck. On the way home it acted like it was slipping, RPM started climbing, the truck started slowing down, I pulled over, shut it off, waited a bit and restarted. Seemed a little better and I limped home. I read the codes and had a P011, P0700, P2771, and P0796. Some of these can be from dirty fluid or a clogged filter so I kept my fingers crossed and dropped the pan. Sadly, there was whole lot more junk in the pan than I was expecting. A lot of stuff on the magnet and still more just sitting in the pan.

There was a time I would have jumped at the chance to yank this out and rip into it. But the last time I rebuilt an automatic it was the 2 speed Turbo 300 in my '65 442. I was a little younger and a lot stronger.

So, that leaves me with looking for a transmission shop. I thought I would see if anyone has had good luck with a shop in my area. So far, I have come across one small shop that really sounds like they know this transmission but can't find any feedback on the shop. Thought I would look for some input.
 

rdezs

Full Access Member
Joined
Nov 6, 2023
Posts
1,140
Reaction score
1,948
I would be shopping in terms for a complete rebuild, with a quality aftermarket torque converter.

The forum is full of reports of rebuilt 6l80s with issues, so you really have to rely on multiple feedbacks regarding any shop.

If you plan on keeping it a long time, don't overlook stopping by the dealer to get a quote. Sometimes they can be competitive, and you can't beat the ease of the warranty.

Has the AFM been deleted? If not, I would get that disabled as soon as possible and plan for the deletion in the near future.

A lot depends on how long you intend to keep the vehicle. In the long run, it's a lot cheaper to address the engine and transmission and keep the vehicle than buying anything relatively new.

I also used to rebuild transmissions occasionally.... Only up through the 4l65e now. Won't touch the 6L80 and newer. Like everything else it seems, they've really overcomplicated a mousetrap with technology that used to be reserved for going to the Moon. (Never thought we'd see 408 horsepower in a stock vehicle with close to 20 miles per gallon though!)
 

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
7,645
Reaction score
19,854
Location
Richmond, VA
Anybody know of a dependable transmission shop in the Minneapolis, MN area? I need my 6L80 torn into and I have not had a lot of luck in the past with transmission shops.

My '06 Yukon got stolen in February right out of my driveway. The insurance company totaled it pretty quickly and that's when I found out that the minute they decided to total it I didn't have a rental car. That made it difficult to go out truck shopping. I had held off truck shopping because I really wanted my Denali back and thought it would turn up (it, or most of it, eventually did turn up). Now I had to act a little faster than expected. I came across a nearby dealership with a 2011 Suburban LTZ that appeared to be reasonably clean for a Minnesota truck. It had a little over 200,000 miles so I was a bit careful because I knew that the 6L80 transmissions have issues and this had a lag in the down shift. I took it to a mechanic for a prepurchase check out and specifically asked for an opinion on the health of the transmission. Two of the mechanics at the shop had Suburbans and experience with their issues. They didn't think the issue was serious but, of course, explained that there were no guarantees. They thought this was a great deal. By the time I brought it back to the dealership it was running and shifting fine. I figured a filter and fluid change was due. You can probably see where this is going.

We made the the deal (AS IS because of the age and mileage). Drove it home, drove it to work, and then everything went to heck. On the way home it acted like it was slipping, RPM started climbing, the truck started slowing down, I pulled over, shut it off, waited a bit and restarted. Seemed a little better and I limped home. I read the codes and had a P011, P0700, P2771, and P0796. Some of these can be from dirty fluid or a clogged filter so I kept my fingers crossed and dropped the pan. Sadly, there was whole lot more junk in the pan than I was expecting. A lot of stuff on the magnet and still more just sitting in the pan.

There was a time I would have jumped at the chance to yank this out and rip into it. But the last time I rebuilt an automatic it was the 2 speed Turbo 300 in my '65 442. I was a little younger and a lot stronger.

So, that leaves me with looking for a transmission shop. I thought I would see if anyone has had good luck with a shop in my area. So far, I have come across one small shop that really sounds like they know this transmission but can't find any feedback on the shop. Thought I would look for some input.
The transmission shop I use here in Richmond I found through Google Maps reviews, and they didn't disappoint. It looks janky AF outside but those guys know what the hell they're doing, and they don't charge three prices to do it.
 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
I would be shopping in terms for a complete rebuild, with a quality aftermarket torque converter.

The forum is full of reports of rebuilt 6l80s with issues, so you really have to rely on multiple feedbacks regarding any shop.

If you plan on keeping it a long time, don't overlook stopping by the dealer to get a quote. Sometimes they can be competitive, and you can't beat the ease of the warranty.

Has the AFM been deleted? If not, I would get that disabled as soon as possible and plan for the deletion in the near future.

A lot depends on how long you intend to keep the vehicle. In the long run, it's a lot cheaper to address the engine and transmission and keep the vehicle than buying anything relatively new.

I also used to rebuild transmissions occasionally.... Only up through the 4l65e now. Won't touch the 6L80 and newer. Like everything else it seems, they've really overcomplicated a mousetrap with technology that used to be reserved for going to the Moon. (Never thought we'd see 408 horsepower in a stock vehicle with close to 20 miles per gallon though!)
Thanks for the response. I have been looking at having the whole thing redone. It gets a little confusing because some guys are talking rebuild, some remanufactured, and the terms get interchanged. One guy I talked to puts in all the stuff I would expect plus a bunch of new valves and pistons that I know very little about. If the pump is bad he puts in a new pump (additional cost) rather than machining the old one. Others seem to spend a lot of time machining the old one. One of my codes is for a stuck solenoid so it sounds like the assembly will have to be replaced. This guy uses a billet converter while some just mention a rebuilt one. Starts at $1550 for the rebuild and hits $4000-$5000 grand with installation, converter, pump, solenoids, etc. I have seen prices up to $7000. Have not checked with a dealer yet.
No, as far as I know the AFM is still active. I real have not driven it enough to know what is working and what is not. I only had the test drive, the trip to get it inspected, the drive home and to work. The one transmission guy that was the most helpful did say that he recommends I reprogram the transmission to reduce the slippage regardless of what else I do. He said there is a 50 rpm slip that can be reduced to 20 rpm (if I heard right). He mentioned something I can plug into the obdII port.
I generally drive my stuff until it rots away. The Yukon that got stolen was purchased in 2017. I had that shipped up from Texas so it was pretty clean. This was a one owner but lived in Minnesota so not as clean. Thanks again.
 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
The transmission shop I use here in Richmond I found through Google Maps reviews, and they didn't disappoint. It looks janky AF outside but those guys know what the hell they're doing, and they don't charge three prices to do it.
Richmond MN or Richmond WI?
The one here that I talked to is just north of me in Forest Lake. He seemed to know his stuff but I couldn't really find any reviews, just ads on Facebook and Craigslist. I also drove by after work and it appears to be kind of in the woods, at the end of a dirt road. Probably fine just not what I am used to.
But the last shop I had do transmission work charged me $1200 for a solenoid pack and within a block of leaving the place I realized they had not fixed the bad 1 to 2 shift I had. That weekend I climbed around the truck and found a broken wire in the harness. It was the 1-2 shift solenoid control wire. That shop had 40 years of transmission experience and a good reputation.
So, you just never know.
 

rdezs

Full Access Member
Joined
Nov 6, 2023
Posts
1,140
Reaction score
1,948
Yes, regardless of what you do..... Once the transmission is rebuilt or replaced, it does need to be programmed for your vehicle. That's basically the factory programming.

After that I would recommend picking up something like the Diablo, that way you could turn off the AFM in the computer which will prolong the engine life until you get around to deleting it physically, and it will allow you to tighten up those shifts to extend transmission life. (Which also makes it run cooler) Don't scrimp on the torque converter. That's a good place to spend some money.
 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
Yes, regardless of what you do..... Once the transmission is rebuilt or replaced, it does need to be programmed for your vehicle. That's basically the factory programming.

After that I would recommend picking up something like the Diablo, that way you could turn off the AFM in the computer which will prolong the engine life until you get around to deleting it physically, and it will allow you to tighten up those shifts to extend transmission life. (Which also makes it run cooler) Don't scrimp on the torque converter. That's a good place to spend some money.
Thanks, yes, I am planning on at least a billet converter. I don't know if I will have any control over the brand. I guess that will depend on who does the rebuild. I will look into the Diablo.
 

rdezs

Full Access Member
Joined
Nov 6, 2023
Posts
1,140
Reaction score
1,948
I know if you end up going through the dealer, you get a 3-year 100,000 mile warranty.... But you'll have to compare their price to make a decision. You'd also want to ask about an aftermarket torque converter, if that would affect the warranty.
 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
Thanks, the one place I am thinking of has a one year warranty but for $1250 more you can upgrade to 3. Some places only have a 30 day warranty. That seems pretty risky.
 

jfoj

Full Access Member
Joined
Aug 9, 2012
Posts
1,120
Reaction score
955
Valve body problems are fairly typical on these transmissions. You have higher mileage so unclear if you could actually get away with a valve body. Depends on how burned up the fluid is and how much debris was in the pan. The debris in the pan can be subjective as well. Unless you have a picture to share it is hard to convey what the pan debris looks like.

Not sure how these guys ship and what shipping costs may be, it may be factored into the trans price??

They probably have the best handle on the valve body upgrades.

 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
I know if you end up going through the dealer, you get a 3-year 100,000 mile warranty.... But you'll have to compare their price to make a decision. You'd also want to ask about an aftermarket torque converter, if that would affect the warranty.
I thought I would add that when I looked up the feedback and reviews for my local Chevy dealers, it was pretty poor when it came to the service departments. I know people tend to leave the bad stuff more than the good but, nobody was leaving any good feedback regarding service departments. However, there was a lot of good feedback on the sales and finance end.
 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
Valve body problems are fairly typical on these transmissions. You have higher mileage so unclear if you could actually get away with a valve body. Depends on how burned up the fluid is and how much debris was in the pan. The debris in the pan can be subjective as well. Unless you have a picture to share it is hard to convey what the pan debris looks like.
Not sure how these guys ship and what shipping costs may be, it may be factored into the trans price??

They probably have the best handle on the valve body upgrades.

 
OP
OP
M

Musicars

Full Access Member
Joined
Jan 1, 2018
Posts
116
Reaction score
74
I'm attaching a picture of the pan debris just for reference. I've since been told that the converter did come apart internally and take out the pump and pretty much everything else. The filter was clearly plugged too. I had it redone with a billet converter, upgraded valve body, and some additional stuff. The place I had do it says they have done hundereds of the 6l80s. Hopefully they did a good job.
 

Attachments

  • Transmission pan.jpg
    Transmission pan.jpg
    349.5 KB · Views: 17

jfoj

Full Access Member
Joined
Aug 9, 2012
Posts
1,120
Reaction score
955
Yup that pan debris is a pretty bad indicator of a bad failure that will need a full rebuild. Once the shavings are above the super fine particles, then you are into the big money.

Sounds like your shop did a pretty good update with the billet converter and valve body, but you might check with them and see if they did any TCM tuning as well to keep the problem from reoccurring if you plan on keeping the vehicle for a while.

Check this video for some of the TCM tuning ideas:

 

Forum statistics

Threads
137,178
Posts
1,955,930
Members
101,790
Latest member
Marc_Pelta
Back
Top