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Old 04-16-2021, 03:30 AM   #2
MasterBlaster
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Join Date: Feb 2009
Location: Port Coquitlam
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Generally, a non-turbo, non-ABS diff will have a 12-slot tone ring.
Add ABS, the ring goes to 48 slots.
(I hear one year even had 96!)
48 / 12 = 4
50KM * 4 = 200KM

Looks like your 12-slot-programmed speedo (1986 745) is getting too many pulses from your (apparently) 48-slot diff.

You need either:
1 - Different diff with 12 slots to match the speedo.
2 - Different speedo to match the current diff.
3 - Modify the tone ring from 48 to 12 slots.
4 - Replace the tone ring with a 12-slot.







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1990 740GL
520,000 km so far...

Last edited by MasterBlaster; 04-16-2021 at 03:38 AM..
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