Speedometer drive gear

anilv · May 9th, 2019, 09:14

Hi guys..trying to help a friend out as his Speedometer quit and its not the cable or the meter itself. So most likely its the gear in the transmission.

I know that there are several colours which translate the trans rpm to the correct roadspeed.. any idea what would be correct for a car that has a B18 with M40 (no overdrive).

Thanks all!
Anilv

Ron Kwas · May 9th, 2019, 13:13

Anilv;

Welcome to this forum!

Speedo cables need to be clean an lubed (stating the obvious!)...I'd confirm cable and instrument before suspecting gear in gearbox, as replacement requires removal and partial disassembly of gearbox, and so is no small job...I would want to be certain with my troubleshooting...remove cable at the transmission, turn core with a drill and have a helper observe instrument...

To confirm which gear is needed, I'd check exploded assembly diagrams and associated parts listings on GCP.com site. Gear color (and toothcount) is a function of Diff gearing, not presence or absence of OD.

Good Hunting!

Derek UK · May 9th, 2019, 13:59

B18/M40/4.10 axle = Yellow (can be a sort of orange) with 16 teeth part# 380164

anilv · May 13th, 2019, 07:33

Thanks all for the help.

I see that 'classicvolvoparts' has the parts I need. Need to get under the car and pull the old one out (to make sure its really the problem!) before I order it.

Anilv

May 9th, 2019, 09:14	#1
anilv New Member Last Online: Jan 7th, 2022 03:22 Join Date: May 2019 Location: KL	Speedometer drive gear Hi guys..trying to help a friend out as his Speedometer quit and its not the cable or the meter itself. So most likely its the gear in the transmission. I know that there are several colours which translate the trans rpm to the correct roadspeed.. any idea what would be correct for a car that has a B18 with M40 (no overdrive). Thanks all! Anilv

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May 9th, 2019, 13:13	#2
Ron Kwas Premier Member Last Online: Today 09:06 Join Date: Jul 2007 Location: Connecticut, USA	Anilv; Welcome to this forum! Speedo cables need to be clean an lubed (stating the obvious!)...I'd confirm cable and instrument before suspecting gear in gearbox, as replacement requires removal and partial disassembly of gearbox, and so is no small job...I would want to be certain with my troubleshooting...remove cable at the transmission, turn core with a drill and have a helper observe instrument... To confirm which gear is needed, I'd check exploded assembly diagrams and associated parts listings on GCP.com site. Gear color (and toothcount) is a function of Diff gearing, not presence or absence of OD. Good Hunting!

May 9th, 2019, 13:59	#3
Derek UK VOC Member Last Online: Today 17:06 Join Date: Jul 2006 Location: Chatham	B18/M40/4.10 axle = Yellow (can be a sort of orange) with 16 teeth part# 380164

May 13th, 2019, 07:33	#4
anilv New Member Last Online: Jan 7th, 2022 03:22 Join Date: May 2019 Location: KL	Thanks all for the help. I see that 'classicvolvoparts' has the parts I need. Need to get under the car and pull the old one out (to make sure its really the problem!) before I order it. Anilv

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