what speedometer gear should i use

[superbeetle73]

i have the 19 tooth beige cable gear and a worn out yellow gear in the transfercase its a BW1345. I am now running 37 inch tires. any input would be great.

 

[hesutton]

I really wish there was a list of gear options and combinations that would correct the speedo with gear and/or tire size changes, but I've never seen one. I'm watching this thread to see what surfaces, and I would love to know what gears to use on my '86 with 37's.

Heath

 

[jhnlennon]

I really wish there was a list of gear options and combinations that would correct the speedo with gear and/or tire size changes, but I've never seen one. I'm watching this thread to see what surfaces, and I would love to know what gears to use on my '86 with 37's.

Heath

Here you go,

http://www.partsmike.com/tech-help/speedo-gear-calc/

Internet is your friend, BTW I believe ford uses mostly a 7 tooth drive gear, and the speedo is calibrated with a 1000 revolutions per mile.

Then go here to find the gear you need,

http://www.transmissioncenter.org/Ford_Speedometer_Gears.htm

EDIT- looks like its an 8 tooth drive gear for borg warner transfer cases, you can tell my looking down the hole and seeing what color it is...

 

[hesutton]

Thanks man! Subscribing to the thread and bookmarking the sites.

Heath

 

[ih8minimumwage]

37s and what gearing? With 37s and 3.55s (T19 and BW T-Case) I used the 16 tooth 'wine' colored gear, and it was about perfect.

I've since swapped out to 4.10s, so I need to switch to I believe a 19 tooth gear. Anyone want to trade?