Speedometer is crazy

[J2772]

Alright so my 1992 explorer isn't super moded but it is running a little bit bigger tires 30x9.5 so I thought I'd put it here. But on my way to school I hit a bad pot hole at about 60mph or so and for a split second the rear abs light came on it kicked the radio out for a sec and now my speedometer is all over the place. Anywhere from being accurate to almost 20mph off. I know with tires it's off about 2mph but nothing like this. And now since the bump my right rear leaf spring creaks like a 50 year old car and my alternator is whining. Any and all help would be greatly appreciated thank you.

 

[J2772]

Also went and looked the speedometer cable is tight at the transfer case and I went ahead and pulled it out and the gear looks fine too. It is the white gear

 

[yostyexplorer94]

if the teeth on both the white gear and the gear inside the transfer case looks good and the cable is spinning like it should, then I would think the speedometer itself is malfunctioning.

 

[J2772]

If it is could it just need calibrated?

 

[roscoe 0202]

try greasing the cable.
roscoe

 

[Centaurious]

Check for broken leaf springs on the side that took damage and inspect the front leaf spring bolt as well.