Welded Diff?
 

I was talking to one of my friends who has a 240sx and he suggested that I weld my differential. I know it isn't the "right" thing to do but I know it works well if you do it right. I'm aware of the consequences and what it can do. Just wondering what everyone else thought on the matter?

how about no! - YouTube


yea um... no... its not a good idea.

if you have a backup go for it. oh and you will have to put up with tire hop/squeak on corners.

yea, if you have a backup.

Also, the wider your rear tires, the more stress it will put on the axles in the turns.
Is your 3.4 really that potent to where you need a locked rearend?

yeah...good point. I was just thinking i could have more fun on dry pavement rather than just in the rain

Weld it? How so and in what spots?

That is ancient school stuff. The idea is to weld the differential gears in order to prevent them from spinning independently. The welding weakens the gears and they eventually break. A "better?" way is to braze the gears as it takes less heat. This is an awful set up for street driving, and especially treacherous on wet or icy road. As both back wheels break loose and there is nothing to keep the rear end from swinging from side to side. It is very hard on the running gear, and when taking a sharp turn the car wants to continue in a straight line, because that is the only direction that the rear wheels can go.

You weld the spider gears together so it is not a differential anymore it just a straight axel. If you plan on driving the car on the pavement don’t do it. When you go around a corner the tires need to rotate at different speed to the point on a real sharp turn from a standstill the one tire barely moves and the other rotates a lot. So in every single tight turn one tire must spin or the tire with hop up in the air (and spin in the air) or the car will stop dead like you pulled the ebrake. I have driven cars with welded diffs on the road. If you have even marginally good tires get a neck brace.
This is common it dirt track cars.

And that's the redneck way of doing it (no offense to any rednecks out there)!
The right way of locking the diff is with a spool, but still, not on a street car.