We were doing a top end on a CAT 3406E and needed a full overhead gasket set plus injector seals. Ordered from Limitless and honestly everything matched perfectly. Head gasket thickness was correct, valve cover gasket sealed up clean, and the smaller O-rings were all there (which is usually what goes missing from other kits). Engine has about 200 hours on it now, no leaks. Solid parts.

I run a small diesel repair shop, so when parts are wrong or delayed, it puts us in a tough spot fast.

We ordered the wrong part on one job (our mistake), and I expected the usual back-and-forth. Instead, they answered right away, confirmed what we needed, and got the correct part moving without making it complicated. The return process was simple and didn’t drag out.

In this line of work, downtime costs real money. It helps working with a supplier that understands that.

I spent a significant time pricing out parts for an engine rebuild and comparing dealer pricing with aftermarket options. I didn’t want to cut corners, but I also wasn’t interested in paying dealer markup if I didn’t have to.

I ended up ordering the rebuild components through Limitless Contracting. Everything showed up well packaged, and the parts looked good right out of the box. Machining and fitment were on point, and we didn’t run into any surprises during assembly.

The pricing made the job make a lot more sense compared to going straight through the dealer. Saved money, but still felt confident in what we were installing.

Overall, it was a smooth process and I’d order from them again for future rebuilds.

I was putting together a higher-output rebuild and spent a lot of time comparing suppliers. I didn’t want to overspend at the dealer, but I also wasn’t willing to gamble on questionable parts.

I ordered the rebuild components through Limitless Contracting and was honestly impressed with how everything turned out. The parts were clean, properly packaged, and matched what was quoted. Fitment during assembly went smoothly, and nothing felt “budget” about the components.

Price-wise, it came in quite a bit lower than what I was quoted locally, which made the whole build more manageable. That was important because performance builds can get expensive fast.

Communication was solid throughout the process. When I had a couple technical questions before ordering, they responded quickly and helped confirm what I needed.

Overall, it was a good experience and I’d use them again on another build.

I ordered a few diesel engine parts through their website and didn’t have any trouble finding what I was looking for. The layout is straightforward, and the filters helped narrow things down without digging through dozens of unrelated listings.

The product descriptions had enough detail to confirm fitment, which saved me from having to call just to double-check basics. Pricing was clear, and checkout was simple — no surprises at the end.

Overall, it was an easy process. I was able to place the order quickly and get back to work.

Ordered an in-frame rebuild kit for a Cummins ISX15 pistons kits, rings, rod bearings, main bearings, upper engine gasket set. I checked bearings and piston measurements before install and everything was within spec. No weird machining marks, no questionable finish. Truck is back on the road pulling heavy and running smooth.