There is a manufacturer warranty on parts. If you find that the part looks to be damaged or unfit to be in service in any way please let us know right away! Parts are no longer under any warranty once they are installed and used, so please take a good look at the part first before installing it. It’s critical to give your parts a good visual mechanical inspection (VMI) before installation, because once it’s in and running, it’s yours.
Gear clusters are difficult to warranty as they are installed by other people that may or may not know what they are doing. Take a close look at your cluster to be sure it’s excellent before installing! If a gear cluster is installed and run in a trans then has issues there is no warranty! We would be more than happy to try to help figure out why you had a failure, but we can not offer refunds or warranty repairs/replacement parts.
To be completely straight forward, we wish there was a way to warranty parts that are used and run in a vehicle, but unfortunately there is a risk having others assemble and install parts like this and that’s the risk you take. There is a reason why no one else offers gear clusters or as many parts as we do for the DIYer. If you don’t know what to look for then you shouldn’t be doing the work yourself. If you are not comfortable with this risk, then have us rebuild the trans or engine for you fully. That way there is no question about anything with the unit, and the whole unit is under warranty for our 14 month period.
This type of warranty is common. Look at any aftermarket piston, crank, or rod warranty and they will say the same thing. Once you install forged pistons in your engine and run them, they are yours.
The legal way of putting it:
Due to the nature of performance applications, the parts are sold without any express warranty or any implied warranty of merchantability or fitness for a particular purpose. Jacks Transmissions shall not, under and circumstances, be liable for any special, incidental, or consiquential damages, including, but not limited to, damage, or loss of profits or revenue, cost of purchase or replacement goods, or claims of customers of the purchaser, which may arise and/or result from sale, installation or use of these parts.
Installation of these parts could adversely affect vehicle manufacturer’s warranty coverage.