Need help with speedo driven gear
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New User
Joined: Mar 2013
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From: Atlas, PA
Need help with speedo driven gear
First off I am new here so if something is posted wrong please let me know.
Now for my issue:
We (I say "We" because this is a family venture) are looking for the correct driven gear for my 85 F350 2wd Dually Dump body. This truck is a pile of parts from different F series trucks. The speedo never worked since we owned it. We were never worried about it until now. We are now looking into it because the old T-18 decided to puke and we replaced it with a T-19. We found the drive gear in the T-18 was worn smooth in the center (not sure why) and don't want the same thing to happen in the T-19 which has a good drive gear.
Here are the specs:
Chassis: 85 F350
Cab: 83 F150
Engine: 460 ci
Trans: T-19 with yellow 7 tooth drive gear
Rear: Looks like Dana 70/70U Dually with 4.10 gears (gears determined using the rotate tire and count drive shaft revs.)
Tire size: 225/75/16 (not original size - dad got these tires cheap)
Tire diameter: 29.3 inches (using miata.net tire calculator)
Current driven gear: 18 tooth, brownish in color, only mark on it is a "2"
If any more info is needed please let me know and I will try to get it. If I can figure out how, I could post pictures if needed.
Thanks in advance for the help.
Now for my issue:
We (I say "We" because this is a family venture) are looking for the correct driven gear for my 85 F350 2wd Dually Dump body. This truck is a pile of parts from different F series trucks. The speedo never worked since we owned it. We were never worried about it until now. We are now looking into it because the old T-18 decided to puke and we replaced it with a T-19. We found the drive gear in the T-18 was worn smooth in the center (not sure why) and don't want the same thing to happen in the T-19 which has a good drive gear.
Here are the specs:
Chassis: 85 F350
Cab: 83 F150
Engine: 460 ci
Trans: T-19 with yellow 7 tooth drive gear
Rear: Looks like Dana 70/70U Dually with 4.10 gears (gears determined using the rotate tire and count drive shaft revs.)
Tire size: 225/75/16 (not original size - dad got these tires cheap)
Tire diameter: 29.3 inches (using miata.net tire calculator)
Current driven gear: 18 tooth, brownish in color, only mark on it is a "2"
If any more info is needed please let me know and I will try to get it. If I can figure out how, I could post pictures if needed.
Thanks in advance for the help.
Freshman User
Joined: Feb 2010
Posts: 39
Likes: 0
From: Casa Grande
Need help with speedo driven gear
TCI Ford Speedometer Gears - JEGS
This link has the formulas you need to convert tire dia to speedo teeth. Once you know tooth count you want, I think there is more available than what is on that page.
William
This link has the formulas you need to convert tire dia to speedo teeth. Once you know tooth count you want, I think there is more available than what is on that page.
William
Last edited by ctubutis; Mar 2, 2013 at 10:05 AM. Reason: remove bold, please use that only for emphasis as needed else it's considered shouting
Thread Starter
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New User
Joined: Mar 2013
Posts: 7
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From: Atlas, PA
Need help with speedo driven gear
Thanks for that web link. It was exactly what I needed.
One more question:
I believe me current driven gear is a type 2 based on comparisons to pictures I have found on the web.
Is a type 2 driven gear the correct one for a T19 tranny or do I need some other type.
Thanks again.
One more question:
I believe me current driven gear is a type 2 based on comparisons to pictures I have found on the web.
Is a type 2 driven gear the correct one for a T19 tranny or do I need some other type.
Thanks again.
Laughing Gas
Joined: Nov 2011
Posts: 1,033
Likes: 11
From: Wausau, WI
I said basically the same thing a while back and got flamed for it, don't know why.
I've switched so many speedo gears out of so many different trannies and have never had any problems.
I've switched so many speedo gears out of so many different trannies and have never had any problems.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Ah ha! Good ol' Google...
Dunno why you got flamed? Shouldn't have been from me, right?
These type places can be filled with lots of chest beating & swingin' dicks trying to show off, though....
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From: Atlas, PA
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Laughing Gas
Joined: Nov 2011
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From: Wausau, WI
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