Mustang differential question

[NOBLNG]

What is the purpose of this block? bolted to the pinion snout on this Mustang Super Stallion differential? Just curious.?

Edited December 6, 2022 by NOBLNG

[Plowboy]

It's purpose is to dampen vibration in the rearend. Kinda like a harmonic balancer on the engine. Some claim it prevents wheelhop. But, it only weighs around five pounds. Some people even remove them. 

[NOBLNG]

Thanks Roger. I guess I’ll leave it there…easier than filing it off.?

[Rodent]

5 hours ago, Plowboy said:

It's purpose is to dampen vibration in the rearend.

In the entire driveline. Some of the automatic Fox bodies had another odd counterweight on the transmission tailshaft. 80s technology, no idea if it really worked.

[Plowboy]

1 hour ago, Rodent said:

In the entire driveline. Some of the automatic Fox bodies had another odd counterweight on the transmission tailshaft. 80s technology, no idea if it really worked.

I had a '79 Cobra automatic with a balancer on the yoke. Nothing on the transmission tail shaft. The weight on the pinion must've worked. My '99 has one.

[tbill]

These type of weights are still used, new style chevy trucks use them on the transfer case of the non v8 models