I have used John Esposito of Quantum Mechanics to rebuild English overdrive gearboxes, mostly MGBs and TR6s, for almost 20 years. His work has always been superb, but I just had an extraordinary experience with him that I thought worth sharing. Three weeks ago, I shipped John a late 1967 Type D three synchro overdrive gearbox for my 1967 MGB roadster. At John's suggestion, I also shipped him my car's original non-overdrive three synchro gearbox for parts. The gearboxes took a week to arrive at John's shop by UPS. Within two days, John had disassembled both gearboxes, diagnosed the faults in the overdrive gearbox, determined which parts he could use out of the parts gearbox and which parts he would have to provide, and sent me a detailed written estimate for my approval. The parts gearbox saved time and money. John promised a four week turnaround. John emailed me last Friday that he had finished rebuilding the overdrive gearbox and was leak testing it over the weekend. It has been shipped to me by truck freight - a two and a half week turnaround. John's final bill was less than his estimate. In addition, John gave what I consider a generous a credit for the remainder of the parts gearbox that he did not use in my build. I recommend John and Quantum Mechanics without reservation. read more

The transmission on my 1971 MGB was making terrible metallic noises. I pulled the engine, detached the tranny and overdrive, and brought both to Quantum Mechanics. John quickly diagnosed the problem and provided a fair repair cost. John not only repaired the overdrive unit but also repaired/replaced other worn components in the transmission as well. My car now shifts and drops into overdrive with complete confidence. I highly recommend Quantum Mechanics for ANY transmission work! read more

Quantum Mechanics, Ltd - Transmission Repair Near Me - Oxford, Connecticut

Quantum Mechanics refurbished a Triumph TR6 transmission and a J-type overdrive units for me this past summer and they did a great job. John E. was helpful when I inquired about getting the work done. I set up an appointment to drop the units off and they were ready for me and helped me unload. The work was done on the schedule that we agreed upon and for the agreed upon price. I would highly recommend Quantum Mechanics. read more

The 1970 MGB overdrive transmission that John Esposito's shop overhauled for me works awesome. No surprises, extremely professional and clearly laid out what was to be done. I can't thank them enough. Mark read more

Very Professional, I highly recommend - I purchased a never used rebuilt Quantum Mechanics transmission with overdrive unit on e-bay from a third party. I installed it in my car, and immediately had problems. I called Quantum Mechanics, went over the issues with them, and they told me the overdrive was defective, and that they would fix it free of charge! I did not expect this after having purchased it on e-bay and knowing it had been a number of years since Quantum Mechanics had seen it, therefore well out of any warranty. I sent it in, and they did as they said and completed it quickly as well. It is now in the car and operating well. Thank you Quantum Mechanics! read more

we sent quantum mechanics a deposit on a transmission we never got he refuses to answer my calls for three months I am ready to take legal action we sent him a deposit in good faith and he will not even answer my calls to get me my deposit back had purchase a transmission elsewhere ray @ paramount classic cars read more