Vevor Go Kart Forward Reverse Gear Box 10T #40/41 12T #35 Go Karts Accessories TAV2 30 40 41 For 2HP-13HP Engine, Transmission Local Honor, 3 Shift Modes, ONLY Works with 30 Series Torque Converter

I used this gear box to add reverse to the go kart I built. It has worked amazingly well. After over a year of hard use, it's still going strong. It made it through one incident where the kids revved the motor and shifted into gear. The key sheared off the drive sprocket, but the gears weren't damaged. I will definitely buy another if this one ever fails.

The gear box was a perfect fit for our kids’ Hammerhead Mudhead 208r go-kart. So far it works great and arrived 3-4 days early. Very pleased.

Works great

No more getting off to move backward. Set up is fairly easy and it seem to be a real solid unit. I did have to buy another sprocket for my application, but easy to source here on Amazon.Price 5 starsValue 5 stars

Not having directions. But once I messed with it I figured it out. Also the driven shaft is to big for a 30 series torque converter. I I got my driven gear half way on and it wouldn't move either way so I finally got it off and sanded the shaft with 600 grit sandpaper until would go on with minimal effort.

All necessary parts included, well packaged.

Overall seems pretty well made make sure unit is filled to correct level with lube. I used 80w90 non synthetic gear oil. Securely mounted and sprockets aligned, unit should perform as expected

Bought for the kids go kart 6 months ago. Thought it would be pretty straight forward. There are no instructions. There is reference to a you tube video but that is not very helpful showing the details of the install it is more about a couple of dudes garage hacking it together. I am a mechanical engineer so I was able to figure it out.The big problem is that the diameter of the shaft is several thousandths larger than the 5/8" driven sheave from the original jack-shaft (Tecumseh 6.0 powersports engine on a Manco 486 kart). I have now spent several hours sanding down the shaft with emry cloth. The steel bushings do not fit over the threads on the shaft so those had to be ground out. Not sure what to use the nylon bushing for. You can't mount it close enough to the engine to use the original shaft spacing so I had to order a longer belt and fabricate a new belt guard. Still finishing it up. I am hopeful that it works good. It appears to be good quality parts and it will be a great enhancement to our kart just wish it was made to tighter tolerance on the shaft and parts. I can accept the other variances as this was not designed for a 25 year old Manco cart. I will update my review and add some pictures after I get it running.