Performance Modified Diesels in
New Windsor Township (NY)

Nice stuff Works perfectly Ty

We had a unit down with electrical issues Performance Modified Diesel had my driver rolling in no time. Great rates and great service thanks for the quick help!

Performance Modified Diesels I had a great experience with Performance Modified Diesels. The team is very knowledgeable, professional, and honest about the work that needs to be done. They took the time to explain the issues clearly and handled everything the right way. The service was done efficiently, pricing was reasonable, and the quality of work was excellent. You can tell they really know diesel trucks and care about their customers. Communication was solid and they treated me with respect from start to finish. I would definitely recommend Performance Modified Diesels to anyone looking for reliable diesel repair or performance work. I will be coming back again in the futur

These guys worked on my Mercedes sprinter, real knowledgeable, reasonable and work with there customers to save on parts and labor. I recommend ?

Brought danny my tommygate and he diagnosed and fixed the issues with 0 hassle.. even saved me a few bucks sodering some wires instead of getting a new switch! Would recommend 10/10

Bought a used car from this guy car was supposed to have a 145k miles come to find out it has 235k miles rotted out very bad very dishonest person do not trust him they're changing clusters on vehicles

These guys take pride in there work to make sure the job is done right, highly recommend for all light and heavy duty diesel repairs and maintenance you don’t see to many shops like this i wouldn’t recommend anyone else as I’ve been to many local shops and this is by far the best

I have a 2023 freightliner cascadia blow a hole through the radiator at 12 o’clock at night and without hesitation they dispatched out to me was able to get me down to they’re shop and have the radiator replaced and have me back on the road the same day , very good people , quality work he went the extra mile with everything to make sure the job was clean 10/10 recommend for heavy duty go to these guys great pricing to very affordable

They definitely took care of me. Got a PM service done for my international LT and replaced oil pan seal. No wait time to me in right away. Also did a diagnostic and got my check engine light figured out. If I'm in the area I'll come back.

Super nice+informative guy! We are traveling on the road for work w/ limited time to spend at a dealership but he gave the truck a once over and reassured us everything looked+sounded good! Super appreciative to have finally met someone that cares about their work and gave us a bit of his time. Will definitely stay in communication w/ him!

Great Guys here, the service was outstanding. I will recommend to my friends and family.

had issue with oil pressure, they helped really fast even tho it was weekend, and denny made a good discount which i never had in NY area ever before

I brought my truck to Danny with a clear deadline, which he agreed to upfront. I was quite clear the deadline was a dealbreaker and he should not accept the work if he could not complete it on time. The timing was critical to my family's long-planned RV trip. Despite promising it would be done in "one, maybe two days tops," he missed the deadline completely without proactively updating me. He later told me he delayed my job to take a higher-paying walk-in. Ultimately it took him six days past our agreed upon deadline to finish the work. During that time, none of the completion timelines he gave proved accurate, leaving me unable to plan, without a vehicle, and uncertain if or when I’d get my truck back. As a result, the experience was extremely stressful, my family lost five days of vacation, had to cancel multiple appointments more than once, and was out over $200 in non-refundable reservations. To add insult to injury, when he finally presented the bill, the price was inflated — followed by a long speech about how much he cares about his customers. Unprofessional and unreliable. Do not trust him with your truck. Update: The owner responded claiming I left out that the exhaust manifold bolts were snapped. For the record, he snapped the bolts while attempting to remove them — something that can happen with older vehicles, and which I understand. But that occurred two full days after the agreed-upon deadline had passed, due to his decision to take another job instead of honoring our scheduled agreement. To suggest that "if everything went smooth we would have been on schedule" is simply inaccurate — the delay was already in motion before the snapped bolts ever became a factor. Rather than accepting responsibility for prioritizing a walk-in job over a promised deadline, he deflects and blames the customer. Everything I stated in my original review is true. The delays, poor communication and broken commitments caused significant disruption to my family’s plans, costing us time, money, and a great deal of added stress. Until this business owner matures and understands that keeping your word is foundational to trust, I strongly recommend others look elsewhere for reliable service.

highly recommend this diesel mechanic! He took great care of me and my semi. Very professional, knowledgeable, and respectful. You can tell he knows what he's doing. Super nice and made sure everything was running right before I left. I’ll definitely be coming back!

Responded quickly on interstate 87 replaced my alternator and flashed the truck on the spot …great service great rates 24 hour emergency roadservice he also has lot of space at shop to park over night

did work on my gmc 2500 Denali, highly recommend this guy very good communication, fast work and everything he does he makes sure it is perfect. this is definitely the place if your looking for good work!

Quickly diagnosed a bad water pump, and had us on the road the same day. Very good experience.

We called the shop for roadside service, to replace def level sensor. Mechanic did a good job with reasonable price. I saved the shop address and whenever will have issue in the area I will call him right away

They did a great job working on my 7.3 power-stroke. Good honest guys. Will be going back for more work. Highly recommend.

Hard working and friendly staff. They do whatever it takes to get the job done. Highly recommend!

Very knowledgeable, very nice and very helpful. Would highly recommend if you need a diesel mechanic!

BEWARE NOT A REGISTERED SHOP misdiagnosed rod knock and said there was metal shavings in oil, pulled the oil pan myself no shavings and pulled the rods, perfectly good all it needed was a new cp3 and lift pump and now I’m out 8k and don’t have a running truck terrible experience took a month longer than promised spent 5k and my truck still doesn’t run, then he said he’d tow it to the next shop, then at 9:45 at night he calls me and says oh it won’t fit on my roll back get it towed or $150 a day storage fee so that was another $300 then he said he was going to drop off the old motor 3 weeks later I had to rent a u haul trailer to go get it because he stopped responding and he said he was going to swap over the fuel system from my old motor, swapped over 5 injectors, sent my truck out with no dipstick and exhaust not connected and my truck covered in hand prints and dirt, absolutely terrible shop. Have texts with him proving all this Danny is a crook and has no business running or owning a shop.

Had truck broke down in Poughkeepsie NY and they were the only guys that agreed to help me in negative temperature to get my truck running. Their rates are good and help you alot. I recommend them for any services.

Good experience , fast service and really good prices , got my denali up and ready to go in less than a couple hours.

Just wanted to give a shout out to Danny and his team over at Performance Modified Diesel . This was the first time I gave a business a 5 star review rating. If you have a vehicle and you’re tired of bad vehicle and customer service! You have to Give these guys a try!! Trust me you won’t be disappointed. They will go out of there way to make sure your satisfied. Thanks Guys.

I called at 3 am in the morning with a hole blown through my 2020 freightliner cascadias radiator and with quick response they had a radiator within hours and had completed the repair efficiently … quality work fair price would highly recommend

This place is awesome their hospitality and determination to get me back on the road was amazing.Thanks to Danny and the guys at performance modified diesel I was back on the road the same day they treated me well and with respect not like some other places. So I highly recommend this place to everyone they do a great job and they will get you back on the road quickly.