Monster Transmission & Performance Opiniões 

I sent my Transmission core in 3/14/26 I still haven’t received my refund on my Transmission core and it is now 5/7/26 I have called and called left messages sent emails no response no message back nothing

The people were so polite and knowledgeable. They helped me 💯 percent. My transmission came in today just as they said it would be. Will definitely use again. Thank yall so much.

I am very pleased with my transmission and the shipping! JC was a lot of help in my order and what I needed for my truck thanks to him I’m all set on my project! Thanks guys."

Absolutely horrible company. on or around the beginning of March, the transmission "banged" out of 6th down to 4th gear, and immediately the check engine light came on. The code was P0765, shift solenoid D. Per Monster transmission and BD Diesel's instructions, I had my mechanic do the initial diagnostic tests. Following that, they wanted the trans fluid drained, pictures sent in, etc., which showed metal shavings in the fluid, and pressures above where they wanted them. At that point, they told us to send it back to them. On or about 8 April, again at their request, we sent it back. During that time they ignored emails and phone calls, then yesterday they finally emailed to say that there is nothing wrong, and that I owed them for labor for diagnosing and shipping to get the transmission back. They haven't responded to the last 3 emails over the past 24 hours, and have refused to acknowledge any possibility of a refund, or explain how they can demand we send something to them, then deny anything is wrong with it. I've been without a truck for almost 2 months now, and it's clear that they do not stand behind their product, their warranty, nor do they care about the consumer after they've gotten their money. I have all the email traffic to support this statement as well.

I bought a new transmission from them it failed within the 1st 6 months less then 10,000 miles After months of being put through hell! they warranty it 2 months later i received a replacement which was left out in a parking lot by their driver, That Transmission lasted 5 miles!
having to hire a lawyer because of no response. STAY AWAY FROM THIS COMPANY NOTHING ON THERE SITE IS TURE

Great experience! Great product! Highly recommend. Ask for T-Mac.

"High quality build
Recommend to purchase great service top notch"

We ordered this transmission and it arrived quicky. Very happy with the shipping speed and customer service support."

Not had success calling them directly as their management won't return calls so I google searched and finally got through to the real owner of Monster transmission which is based out of south florida. They are called Hidden harbor capital partners in Boca Raton. After speaking to someone at their main office I finally got a resolution and wanted to share this experience as I'm sure others are having the same problem from what I read online.

Very good transmission. Lived up to my expectations!!

Customer service was great and shipping was fast and professionally packaged! Transmission was built to the highest quality standard!

These transmission are built to handle what you throw at them.

"6L80E
It was a pretty straight forward transaction. Frankie was great and helpful with all questions I had. Trans arrived very quickly and the process of replacing it was just a fast from my local shop. So far everything Works like a charm. Thank you Monster Trans"

Well, the first transmission from monster lasted weeks. Lost fourth gear. The replacement lasted 8 months. Same problem... Lost fourth gear. Had to pay shipping for the first replacement. They wanted me to pay $600 shipping AGAIN! No friggin chance. I'm taking my business elsewhere. DON'T WASTE YOUR MONEY WITH MONSTER TRANSMISSION!!!

Incredible Company and Product

This thing is a beast. I have an old truck that needed a transmission. The Monster team was super helpful in getting the information I needed and they got here to me quickly. The transmission was clean and had been painted. Built extremely well and works more than perfect. Thank you Monster for a great products and service!"

"Great quality unit!
Overall I'm very happy with everything. The help line was very helpful and knowledgeable with technical questions."

"Transmission

Bought one of there transmissions was not sure at first but im really happy I did this thing has been amazing shifts so smooth if you are on the fence about buying one of monster transmission you should definitely do it i highly recommend it super fast shipping and return"

Was charged a core deposit fee without any notes on “we won’t take back this model of transmission back because having your old transmission shipped back is more expensive”….kind of messed up because I waited over 3 months for them to find a core for a 97 4l60e so clearly it’s not like they’re just laying around for $10 at a yard sale. Either don’t charge the core fee, if the type of model is not cost efficient to ship back, or be honest and charge a $300 shipping fee and NOT promise a “quick and simple core return”.

6l80e

Staff very helpful, arrived within a week. Would recommend again but hope I don’t have to buy a new transmission!"

"Great product
Customer service was good. Frankie answered all my questions and got me everything I needed. Transmission works well and I am very happy with it."