Speedometer gear?
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Tuned
Joined: Oct 2001
Posts: 328
Likes: 4
Speedometer gear?
Hi all.
Have a '76 F150 4x4 with what I believe is a NP435 transmission. I would like to get the speedometer working and have no clue of the tooth count for the required gear (gear is missing). Any ideas on how to determine which gear I need?
I'm plan on driving the truck from AZ to Washington state here in a couple of weeks and don't want any speeding tickets
.
Thanks in advance!
Have a '76 F150 4x4 with what I believe is a NP435 transmission. I would like to get the speedometer working and have no clue of the tooth count for the required gear (gear is missing). Any ideas on how to determine which gear I need?
I'm plan on driving the truck from AZ to Washington state here in a couple of weeks and don't want any speeding tickets
.Thanks in advance!
Post Fiend
Joined: Jan 2006
Posts: 5,037
Likes: 9
From: Kasson, Minnesota
Are you looking for the gear that attaches to the end of the speedo cable or the gear inside the transmission?
What is the rear end gear ratio and tire size?
There is a formula to calculate.
http://www.bgsoflex.com/speedo1.html
What is the rear end gear ratio and tire size?
There is a formula to calculate.
http://www.bgsoflex.com/speedo1.html
Post Fiend
Joined: Jan 2006
Posts: 5,037
Likes: 9
From: Kasson, Minnesota
The revs per mile usually is defaulted to 1000 referring to the odometer. Also, I think the Drive gear in the transmission is a 7 tooth, but correct me if I'm wrong. If its a 7 tooth Drive gear than based on the formula and the info given, you should need a 16 tooth driven gear.
http://www.bgsoflex.com/cgi-bin/spee...en&givengear=7
http://www.bgsoflex.com/cgi-bin/spee...en&givengear=7
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