Which speedometer gear do I need?
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Posting Guru
Joined: Mar 2005
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From: In the Middle
Which speedometer gear do I need?
What would be the correct factory speedometer gear for a 1978 F150 with a 302, 3 speed manual, and 2.75 gears?
My '78 originally had 3.00 gears, but someone has swapped them out 2.75 gears and my speedometer is off.
Can I just change the gear on the cable? Or do I need to change the one in the transmssion also?
My '78 originally had 3.00 gears, but someone has swapped them out 2.75 gears and my speedometer is off.
Can I just change the gear on the cable? Or do I need to change the one in the transmssion also?
Laughing Gas
Joined: Mar 2007
Posts: 754
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From: southwest Wisconsin
Cargo Master
Joined: Dec 2006
Posts: 2,511
Likes: 8
From: hinckley ohio
you can just change your gear. if you pull gear out it will have a number on it like 15 thru 22 witch is how many teeth it has. when i did mine the speedo. was fast 15 mph i went up 2 teeth and its good. hope this helps.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Originally Posted by 460
What would be the correct factory speedometer gear for a 1978 F150 with a 302, 3 speed manual, and 2.75 gears?
When I went to 3.25s with 235/70-15's it took a 19 tooth to get it right on.
Use the sites indicated in the FAQ, but also be sure to include your tire size in the calculations. (Tire Rack will give you your tire size's revolutions per mile.)
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