Speedo drive “turtle” on transmission

[Kube]

The drive gear is identical amongst the passenger cars. Simply locate the proper driven gear, install it and you're done.

And yes, with the "wrong" driven gear, your speedometer should operate albeit inaccurately.

[rockfla]

SO....last stupid question and/or double checking, logic tells me that the turtle is mounted/oriented with the speedometer cable end pointing downward or toward the left side of the vehicle?? OR I didn;t check BUT the "turtle" can only mount one way???

[Mart]

The output sticks away from the torque tube in the same direction as driveshaft rotation in forward motion.

That's to the left on top or right on the bottom or down on the left and up on the right.

It can be fitted backwards and the speedo will only work in reverse.

Mart.

[rockfla]

Originally Posted by Mart

The output sticks away from the torque tube in the same direction as driveshaft rotation in forward motion.

That's to the left on top or right on the bottom or down on the left and up on the right.

It can be fitted backwards and the speedo will only work in reverse.

Mart.

So is this the "correct" orientation???

[Kube]

Originally Posted by rockfla

So is this the "correct" orientation???

yes

[V8COOPMAN]

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Originally Posted by rockfla

So is this the "correct" orientation???

Yes, CORRECT orientation! DD

[V8COOPMAN]

Originally Posted by rockfla

SO.....
What I am pulling from ALL the above IS.......The housing I have is with a high degree of certainty is correct? My issue "most likely" is the actual drive gear?? As I read the chart......with a 16" tire, 3:54 gear set it will MOST likely be a 20 tooth gear???

Thanks
Rockfla

What is the actual descriptive size of your 16" tire, i.e. 6:00 x 16", or 7.50 x 16"? According to the chart, most of the normal or "near-stock" sizes should require a 20-tooth gear, although a large-outside-diameter tire like a 7.50 x 16" with a 3.54 would take the 18-tooth gear. DD

[flatheadmurre]

And the drive gear is locked in place as it should ?
If the snapring holding it has come loose you get issues with it moving and loosing contact...

[rockfla]

Originally Posted by V8COOPMAN

What is the actual descriptive size of your 16" tire, i.e. 6:00 x 16", or 7.50 x 16"? According to the chart, most of the normal or "near-stock" sizes should require a 20-tooth gear, although a large-outside-diameter tire like a 7.50 x 16" with a 3.54 would take the 18-tooth gear. DD

They are 6.00 X 16's. I just looked at the chart and 3:54 with 6.00 x 16 both 4 and 6 ply tires shows an 18 gear, or am I reading it incorrectly???

[rockfla]

Originally Posted by flatheadmurre

And the drive gear is locked in place as it should ?
If the snapring holding it has come loose you get issues with it moving and loosing contact...

Thinking over what I have previously done I believe this may be the issue as I think I remember it being able to move back and forth quiet a bit???? I will pull and check it tonight. Hopefully IF the snap ring is missing on the good one I can rob one out of the "bad" one???



Thanks to everyone for your help and advice, I may also be looking for a 20 tooth gear

[V8COOPMAN]

Originally Posted by rockfla

They are 6.00 X 16's. I just looked at the chart and 3:54 with 6.00 x 16 both 4 and 6 ply tires shows an 18 gear, or am I reading it incorrectly???

You DID read that correctly when you look at the 6.00 tires and the 40 17270 turtle. I take that to relate to MODEL 40 ('33&'34). If you look a little further down at the 6.00 tires and the 68 17270 turtle (which SOMEHOW seems to relate to MODEL 68...1936 model year AND LATER), the chart indicates a 20-tooth. There's obviously a part of this puzzle that is escaping us mere mortals. DD

[ford38v8]

Originally Posted by V8COOPMAN

You DID read that correctly when you look at the 6.00 tires and the 40 17270 turtle. I take that to relate to MODEL 40 ('33&'34). If you look a little further down at the 6.00 tires and the 68 17270 turtle (which SOMEHOW seems to relate to MODEL 68...1936 model year AND LATER), the chart indicates a 20-tooth. There's obviously a part of this puzzle that is escaping us mere mortals. DD

Well, I guess I'll put my foot in my mouth now. I believe rockfla got it right. The prefix of the part signifies the period of time the part was first made available, and is not limited to any certain year by the fact that the prefix corresponded to a year model. This was a standard practice that held true for many different parts, although not exclusively as we all know, never say never, never say always.

Turtle housings were made specifically for the gear enclosed, with that tooth count number boldly displayed on the turtle's shell. Each housing was different in the respect to the depth of it's gear's centerline, in order to mate correctly with the drive gear, which were all the same. This is the way it was done by Ford back in the day. Today, however, repop gears are made and jury rigged into whatever turtle is available, by those who cannot find or will not pay for the real McCoy. This practice of mix & match confounds and confuses the new generation of Fordophiles, and apparently some of the old geezer generation as well. There, I said it and I'll shut up now.

[V8COOPMAN]

Ya know....sometimes when ya (I) think ya know a little bit about something you've been messin' with (these old used cars) seemingly forever, it takes another (possibly even more-seasoned) old geezer to step-in and slap ya (ME) around just enough to remind oneself that oneself has either forgotten some really pertinent info, or worse yet, that the person being reminded is likely (at least THIS time) confused and FULL OF IT! In retrospect, Alan (ford38v8) is absolutely correct in every statement he has made just above. Thanks for keeping me straight and somewhat honest, Alan! Apparently, all of this "accumulated mileage" can occasionally cause a severe miss in performance. DD

[Tinker]

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[rockfla]

Once again, thanks for all the help and knowledge. I learned a valuable lesson in respect of "don't trust what you are seeing when you can "only" see about 1/4 of what you're looking at!" Low and behold, 1/2 of the drive shaft worm gear is "toast"!!! SO it's looking like a "nice" future project at some point to drop the rear and fix!!! Thanks again for ALL who helped me "LEARN".


As an aside......anyone have a speculation as to what might cause this kind of damage??? The "mushed" turtle gear still spins nicely???

[Mart]

What is that thing (or substance) wedged in the top of the opening in picture 1?

Glad you opened it up and found the source of the problem. Good thing is, the worm is standard across all passenger cars so should be easily found.

Mart.

[Kube]

[QUOTE=rockfla;1886613]Once again, thanks for all the help and knowledge. I learned a valuable lesson in respect of "don't trust what you are seeing when you can "only" see about 1/4 of what you're looking at!" Low and behold, 1/2 of the drive shaft worm gear is "toast"!!! SO it's looking like a "nice" future project at some point to drop the rear and fix!!! Thanks again for ALL who helped me "LEARN".


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