Monster Transmission & Performance Reviews 

This company is a JOKE!! I was upsold to a Sportmonster 6l80 for my Silverado because I stated I needed something that can handle towing and not fail. Immediately out the box the trans pan was bent/dented in, the dipstick port and cooler line ports weren’t sealed for shipment & spending almost 5k for this trans you figured it would come with gaskets to install…

So we went ahead and installed this transmission, once installed and filled we went to start the truck, threw a bunch of lights on the dash, no start, no PRNDL indicators lit. After research found the TECHM in the transmission was missing a few pins compared to the original connector from the other trans. I called monster and they said they are sending me another TECHM & oil pan and my warranty is going to be voided…LMFAO.

THIS COMPANY IS A DAMN JOKE! STAY AWAY FROM BUYING ANYTHING FROM THEM!!

The customer service I received was great. Madison got me taken care of and help with any questions I had.

Fast shipping great for towing
"6l80 torque converter
Torque converter worked good for daily driving"

"2018 Expedition

Factory 10r80 had all of the problems that Ford left us with. B&D transmission fixed everything better than new!"

The torque convertor for the 6l80 transmission was defective. When installed the car had a vibration it never had before. This was installed by a mechanic shop. I notified Monster Transmissions. They tried to say it wasn't their product, but it was my car. I had to take the car to a transmission shop to have perform a diagnostic test to prove it wasn't my car's fault. Then they told me they wouldn't cover the cost of the new install because the product is manufactured, and they can't guarantee it will work. That only shows they don't stand behind their products and the quality build is poor. On top of all of this, I had to pay $247 for the shipping as well. So there went my core return and then some. All of this took about 6 weeks. The car is my daily driver, so I lived out of a rental for six weeks on top of all this. They attempted to tell me that when they received the convertor it was dry and that I needed to check my TCC again and have my front pump inspected. They did rebuild the convertor. When installed for the second time, the car runs fine. No TCC or front pump issues, just a torque convertor that was not properly balanced. Stay away for this company.

What went wrong as in the first time the transmission blew up just normal driving and tail shaft seal leaking. Mention all that was wrong with it. Sent back and they rebuilt it. But still wasn't shifting correctly and leaking fluid. Just getting fluster with them. Had transmission shop pull trans and found torque converter leaking and shifter seal leaking. So had them pull apart and they found used hub and just parts in it as in cheap stuff. So they rebuilt it now and works awesome now.

Madison Bowman was great. Answering all my questions and fast purchase.

We are a professional custom auto shop with years of experience working on high-end vehicle builds. After ordering a transmission and a rebuilt NP208 transfer case from Monster Transmission, we experienced an ongoing series of major issues that cost us time, money, and credibility with our customer.

The problems began when we were given incorrect guidance from Monster’s technician, who advised us to go with a ¾” output shaft. After receiving the unit, we discovered it was the wrong length. We provided precise measurements and returned it, only to receive another transmission with a shaft that was over 6 inches long. We were then told by their technician to cut the shaft down ourselves.

Upon installation, the transmission leaked from the front pump seal. Additionally, the case port had stripped threads, something we had specifically requested be fixed during the return process, and it was ignored. The transfer case we had sent in for rebuild came back with a fluid leak, and our ASE-certified technician discovered a hairline crack that had been completely missed. That crack allowed transmission fluid to fill the transfer case.

Despite providing proof of torque converter purchase from another vendor, as required to qualify for a 3-year, unlimited mileage warranty, we were told the unit was only covered under a 90-day warranty. Most of that time had been consumed by Monster Transmission's own slow response times and repeated errors. Their customer service delays routinely lasted weeks, and our multiple attempts to contact our sales rep went unanswered.

To make matters worse, Monster Transmission curates their online reviews and only displays 4- and 5-star feedback on their website. That level of selective publishing is incredibly misleading and does not reflect the full scope of customer experiences.

When we finally received a response from their support team, we were offered a bench inspection only if we paid for round-trip shipping and diagnostic fees ourselves. After all the back-and-forth, lost labor hours, rework, and reputational damage to our business, we requested a modest $1,000 refund to help offset the impact. They declined.

Our experience with Monster Transmission has been one of the worst we’ve had with any supplier. If you're considering them for custom work or rebuilds, think twice. Their quality control, communication, and willingness to stand behind their product have been profoundly disappointing.

"F-150 new life recharge

Replaced my old clunky, slipping, rattling, hard shift 18 FORD 1080r transmission with a Monster tranny from B & D, Although a difficult time consuming swap, well worth the time, its now better then new, clunks and hard shifts are gone, very smooth operating.... hope it lasts longer than the factory one, which barely made 100,000 miles"

Called in to verify I ordered the right kit they were friendly and helpful

THIS PLACE IS TERRIBLE. I sent them a working 700r4. worked fine no issue but we were doing a full build so customer wanted everything rebuilt or replaced. they wanted a monster transmission instead of using our normal local guy. The transmission lost 2nd and 4th gear withing 5 miles. we sent it back 2 more times at our shipping expense just to have the same result. ultimately i took it to our normal local guy who promptly fixed it up. the front pump did not have any of the updates done. the valve body separator plate was drilled in the wrong spot allowing check balls to pass through where they should not. amongst some other items I cant remember. will never touch a monster transmission again. in fact if someone brings us a car with a monster trans in it for repairs to the transmission, we will not touch it we will insist it be replaced as we do not want to go behind their terrible work.

Top notch service,knowledge, and quality. I couldn’t be more excited. I made changes to my engine and needed a transmission that could hold up to the HP increase. Couldn’t be more pleased

Installed 4l80e 30k miles ago, changed fluid and filter after 14k miles from install, after another 16k miles started shifting strange, checked dipstick, was full but burned terrible smell, my yukon has trans temp guage and was never run over 190 degrees ever, I’m the only driver of it as well. I used dextron6 synthetic just as I was supposed to, I was assured at purchase that it was built with all updated parts. I do not believe it was built with quality parts, no way should this be bad already, the inferior GM original made it to 225k. Do not buy this junk!

Very helpful, answered questions promptly. Everything has been an A+ Thanks Madison"

"Quick service
Everything so far has been great. Service is awesome and delivery was way sooner than expected. I’ve got it installed but I’ve gotta get the computers reset before I can judge the build quality."

transmission fluid

Great experience, great Customer service. Always best to run the fluid Monster Transmission recommends for your build!"

They sent me the wrong transmission. Then took them 18 days to get me the right one. Also would not paid for my truck sitting idle and in the way for them 18 days that in sit in the way. Having to gat a lawyer involved to even try to get my core charge. I will not order anything for them ever again. They are absolutely horrible company to deal with

Guess my first review was takin down. So I have been back and forth with monster for over 4 months. After my first bad review over selling me a bad transmission from another company and not holding up to the warranty that they promise. Wanted me to go through the company they used (BD diesel) warranty process. Tazz from their warranty dept contacted me and wanted to make it right. So they had no record of the warranty claim and was going to email me a link to send in another. Never happened!! No email no more contact just ghosted! So I sent it in like the last time I tried. Through their warranty dept. that was close to a month ago. Still no contact. I guess I’ve just been took for 5000. Stay away from this company. !!

Great service and timely shipping. Great product