Speedo gear issue (not dead horse)

I have done the search and found a huge amount of info about the speedo gears needed and used in the past forums. With all of my looking and reading I either missed the info I am looking for or it isn't there, I still have a couple issues/questions.
Here's what I am starting with
69 CJ5, V6, Single stick Dana 18, 3.73 gears, stock tires

When I got it, speedo was inop, pulled speedo gear 16 teeth, it was all rounded out in the center of the gear. couldn't locate another 16 tooth, got a 15 tooth installed to verify if it cluster worked or not. 15 tooth last for a bit, when it did work it was way under what actual speed was. 20 on cluster=33 mph. Then it shredded in center like 16 tooth gear pulled out?
Have pulled the trans and tcase apart for resealling/cleaning. Found the shims on the rear output of tcase missing, so those are in the mail to get installed.

Now down to the questions:
Are the missing shims the possible issue for the destruction of the two gears?

Any other possible sources for 16 tooth gear? "Walck's" closed?

With it showing much slower than actually going wouldn't a smaller gear tooth count spin faster on the cable to show correct speed?

 

my 67 cj-5 had the same problem.on mine the drive gear was frozen on the output shaft.got it off and used some emory cloth to clean up the inside of the gear and also the shaft. oiled the gear and put back on the shaft and have had no more problems with it. do not think the shims would cause the problem you describe.

 

Checked the drive gear on the output shaft when resealling, Moved freely with no signs of wear.

 

I suspect the speedo cable itself is binding on the inside of the casing due rust or very sharp bends and causing undue stress on drive gear. If the inner core was replaced, it could be too long (also causing bind).

 

Cable was replaced when the 15 tooth gear went in ran it around as wide and loose as possible to keep it off the muffler/exhuast.
Any other input on the other questions of finding possible 16 tooth or why 15 tooth is reading much slower and why less number of teeth wouldn't read faster?

 

Just guessing but thinking 16:1 verses 15:1 would be slower on 15:1. As for where to find, dunno.

 

pics of gear would help.

 

drive gear = gear on mainshaft, internal.
driven gear = where the cable attaches, external.
the drive gear should be tight on the mainshaft when the assembly is torqued to proper specs with proper endplay; it's job is to drive the driven gear; if loose, it can't do that.
the drive gear must be matched to the driven gear; if not, one or both will be damaged; several different driven gears will work with only one drive gear, but they must be matched or from the same series.
if apart, what is the S-W number on the drive gear ?

 

:iagree: the 15 and 16 tooth gear may both be wrong that could be why the are getting chewed up

 

Holiday delay on the shims required, Will make sure the "drive gear" is installed and torqued to the correct spec. Will have to dig for the "driven gears" that attached to the cable to get some pics of them destoryed.
I have pondered it some more and looked at it from a different view and can see how 16 would now spin faster than 15.
Great so if I need the 16 where do I find one????

 

they are getting hard to find, they are no longer being made. Donor vehicle, classifieds, used Jeep parts places, etc etc.
if it were me, before you put it together, get the Stewart-Warner number off of that drive gear so we can make sure of the correct number of driven gear to be used....or you're just wasting your time, effort....and another gear.

 

will get the numbers from the part when getting into the crawl space to put the x-mas stuff away.

 

Couldn't find the original in the 5 boxes of parts in bags. Did however find the chewed up 15 tooth gear which has no #'s on it. Here is the best I could do on a pic of it. http://memimage.cardomain.net/member_images/9/web/2649000-2649999/2649755_41.jpg

 

Got the shims, just pulled the tail section off the t-case, found the part number on the "Drive Gear" SW 447331 18-6
guessing that means 18 tooth "driven gear to cable" 6 tooth on the "drive gear"
Next question:
the Drive gear goes on smooth in in direction and will spin freely on the output shaft, The other direction requires a bit of effort and does not spin freely? WHich way?

 

The speedo drive gear goes onto the output shaft with the small colar to the inside. Followed by washer and castle nut. Dont have torque spec on nut but someone may chime in.

 

Thanks, think I got it back together, now another issue has come up......

 

drive gear SW # 447331 matches to the following driven gears only:
18 Tooth SW# 448493
20 Tooth SW# 448494
22 Tooth SW# 448495

there is another later drive gear that would work also; this is SW# 447537.
This drive gear would work with the following driven gears:
15 Tooth SW# 448855
16 Tooth SW# 448856
17 Tooth SW# 448857
18 Tooth SW# 448858

This is from the info I have on the subject. The gears will be hard to find.
Dana 20 cases could be donors, but the numbers would have to be checked and verified before installing and running the gears.
Sometimes you can tell if they will mesh or not simply by holding each in your hand and running them/turning them with your fingers as you watch the engagement/spacing of the teeth.

Good luck on your search.
Maybe other members who are more knowledgable/experienced with swapping the gears around will jump in here with their findings on the subject.

 

I saw that info from a search, now comes the challenging part. thanks again for all the input.