Fast 12 gearbox, no matter which one is used, it will make a crash as long as it is forced uphill. What is broken?

Generally, when the car goes uphill, there is abnormal noise. First, you should find a professional to check and judge what the problem is, otherwise you may lie on the road!

As for what the problem is, I can only help you analyze it. Generally, the problem of the rear axle should be considered before the sound appears when struggling uphill, and then the transmission should be considered after being eliminated! Generally, the abnormal sound when you struggle is the phenomenon of tooth surface peeling!

So if it is the rear axle, it may be eight wheels, large and small!

If it is a transmission, it may be a low gear, or it may be a welded shaft gear!

As for how to judge the rear axle or the transmission, you only need to look at whether your car has sound in high or low gear! Or both high and low! If there are both high and low gears, it is generally a problem with the rear axle, but if there is resistance, it may be a problem with the welded shaft of the gearbox or a problem with the low gear!

I hope I can help you, because the sound problem is difficult to describe and needs personal experience to judge. It may not be comprehensive, so don't take it amiss!