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'90 Speedo questions

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Old Jul 28, 2023 | 05:02 PM
  #1  
hayden01's Avatar
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'90 Speedo questions

'90 E.B. Bronco, 302, 5spd standard.

The truck in question is still bone stock beleave it or not. When I got it it had 31x10.5 LT tires on it and the speedo was off about 1-2 mph. I had thought that the organal owner had not accounted for the bigger tyre size and left the speedo alone & thats why it was off.
I recently got new tires for it and went back to the stock size of P235/75. Now the speedo is off by about 3mph.
Currently the ABS light is on all the time. So 2 questions:
1) Does the ABS tone ring feed into the speedo side at all on the '90's?
2) Is the speedo on the '90 a gear driven or vss? Im getting conflicting information doing online searches.
 
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Old Jul 29, 2023 | 05:11 AM
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You should have a VSS in the transfer case for the speedo on your 1990
 
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Old Jul 30, 2023 | 03:42 PM
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Originally Posted by hayden01
Currently the ABS light is on all the time.
RABS Codes


Originally Posted by hayden01
So 2 questions:
1) Does the ABS tone ring feed into the speedo side at all on the '90's?
No it does not.


Originally Posted by hayden01
2) Is the speedo on the '90 a gear driven or vss? Im getting conflicting information doing online searches.
Gear driven by a drive gear in the transfer case tail shaft as stated above.
 
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Old Jul 30, 2023 | 06:56 PM
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If the ABS lamp is on all the time on your 1990 you need to pull the code out of the RABS module, and it most likely needs a new RABS valve on the frame under your seat
 
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Old Jul 31, 2023 | 08:33 AM
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The mechanical speedo is driven by a cable from the trans/t-case in this vintage truck and 1-2mph off is well within spec.. they all read high and most are off more than that.
 
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