Speedometer jumping

1997 JEEP GRAND CHEROKEE
200,000 MILES • 5.2L • V8 • 4WD
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TONYMM
  • MEMBER
  • 2 POSTS
At any speed ,speedometer jumps to 120 mpg on a incline through transmission out of gear. Where on transmission is sensor located and looks like. would this make vehicle run hot, over heat also?
Jul 9, 2017 at 4:39 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
The speed sensor has nothing to do with overheating that may be a blown head gasket and should be either pressure or chemically checked. Auto parts rent the tool and system has to be full of coolant. See link.
https://www.2carpros.com/articles/head-gasket-blown-test

Speed sensor is at rear of transfer case. also, try unplugging dash then plugging back in.
Jul 9, 2017 at 11:17 PM
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