Speedometer is pegged

Tiny
RCOLE0388
  • MEMBER
  • 2003 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 228,000 MILES
I just put a 4r70w transmission out of salvage yard in and when I drove it after install my speedometer goes an hits a 100 mph and I am only doing about 30. I believe it is tripping the governor because it shuts down until needle drops below 99 mph. I have replaced speed sensor in differential and rear of transmission. It never did this with old transmission.
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Friday, September 8th, 2017 AT 7:32 AM

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Tiny
KEN
  • ADMIN
Did you have the 4r100 before? I would check the connection at the output shaft speed sensor. Here are the wiring diagrams (below) for both so you can do a pin to pin check by following this guide.

https://www.2carpros.com/articles/how-to-check-wiring

Please let us know what happens and upload pictures of the problem.

Cheers, Ken
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Saturday, September 9th, 2017 AT 11:46 AM

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