Speedo cable leaking?

[midniteblues]

My 67 has been sitting all winter and the speedo cable has been leaking.I replaced the speedo bullet with one with good seals but its still dripping out of the cable right after where its crimped on to the spiraled cable jacket. Is it time for a new speedo cable? I noticed that these cables dont have the plastic coating on them like most other gms. I have some other speedo cables layin around but just thought I would ask too see if this is a common problem and to get some advice

[MrSchaeferPants]

I've never had one leak where you're talking about, usually right at the housing. Is that black strip an o-ring? Perhaps a new o-ring and retaining clip? I'd say possibly it's leaking and traveling to the part you're talking about, but I don't know how it would w/o you seeing it further towards the housing as well. Or maybe it did, and some oil collected there, and stopped leaking, and the trail from the housing to where it's crimped drained down and you can only see where's it's collected. I dunno?

[Daaaanz67]

Their is also an inner seal that seals around the speedo gear that is replaceable. Also check the speedo gear carefully you will probably see a groove or wear mark on the gear where the seal rides on this is usually the issues for the leak. Also to replace the inner seal, just look at the side the cable connects you should see some sort of a wire clip. Pull that out then remove the seal pay close attention to the way this seal comes out most people reinstall the seal backwards and wonder why it still leaks.
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[midniteblues]

Well the old speedo gear did have a nice groove around it where the seal was. So i had two other trannys and the one that was the most dry went in with a little grease smeared on it was a nice good tight fit so i filled the trans again and watched the crimped part start to drip very slowly. now over nite it made a 5" wet spot on the floor. Ive never seen one leak here either this is why I asked. The only think I can think of is the inner seal for the gear but this one was from a clean dry tranny full of fluid that didnt leak and the seal and the lil' ring clip was in the rite way an in good shape I hate chasing leaks

[Daaaanz67]

How long did those other dry parts sit around for they also have a tendency for the seal to dry up did you also check the gear and seal on the new piece you put in. I use to work in a gm dealer ship back in the mid eighties and chased these leaks all the time our fix was new speedo gear an speedo gear seal new o ring bullet seal. Also when looking at speedo gear seal you need to also feel if the seal is still pliable
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[midniteblues]

I didnt really do a search for the new seals yet. but Im guessing thats the way to go can anybody tell me where to get them besides 20 buck ebay. the one place i was at couldnt find anything on their puter so Im not to sure where to look for such a part.

[slikside]

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[midniteblues]

Thats the culprit its gotta be! now I just gotta locate a new one. I found just the seals online but Im gonna check the nearby trans shops this week.while im in there maybe they could point me in the rite direction matching the speedo gear to the rear for a more accurate mph it seems too be about 5-6 mph off

[jondancer]

Anyone have a diagram? I think my problem leak is also at the speedo cable
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[Daaaanz67]

Every repair I've made the speedo gear and gear seal along with bullet o- ring were always replaced all together
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[rsavage]

NAPA lists one for my 71 TH350. You don't indicate what transmission you have, but you might check with them. Here is the one listed for my transmission: ($1.49)
http://www.napaonline.com/Catalog/Ca...043_0346253084

[duallyjams]

That's fits inside of the steel bullet speed o gear?

[rsavage]

That's what I was told. They had to get one from the warehouse. Seems to make sense - has slightly over 1/4" inside diameter and is listed as speedometer pinion seal. I replaced the o ring yesterday ( which they had) and I'll have to check today to see if that cured its dripping (I doubt it).

[oldgoalie]

If you didn't live on the other side of the country you could stop by my shop, I would give you the seal. I keep them in stock, both for the aluminum and steel bullets. I would guess that any tranny shop would have them. Just to clarify it's not the steel bullets but the aluminum ones that will wear. The steel bullets have a little metal clad seal, the aluminum ones have a small rubber seal held in with a small wire ring. There is anough room in the alumunum bullets to put 2 seals in, sometimes that helps, but the steel one is the way to go. Somewhere on this site is a chart with ratios and speedo gear listing, I've seen it, but can't find it again. If you can't find the seals, I would be glad to send you one. Something I just thought of, the early steel bullets didn't have a seal at all or a way to install one. You might have one of those. All the replacement ones have a seal.

[midniteblues]

I just wanted too say thanks guys for pointing me in the right direction. For some reason I wouldve never thought of the "trans shop" just so used to going to the parts counter or mail order for stuff anymore .I'll chime back in with my results then. I couldnt imagine being an old chevy truck owner an not knowing this site. thanks guys

[midniteblues]

once again guys thanks for the info on dealing with this.On the way home from the trans shop I was thinking that I really do like "wet spots" but not under my vehicles So heres the new bullet,inner seal, o-ring,and gear. and old goalie hit the nail on the head the very first bullet I pulled out of the trans was a older manual trans bullet that didnt have a inner seal because it mounted at an upwards angle in the trans(no wander it leaked so bad)that one was in it when I bought the truck and it had silicone all over it(love that stuff)before I ever drove the truck it got replaced with another but still leaked(not as bad though)I put the others i had back in the trannys i have stashed for a rainy day. I did grab two bullets from the j-yard over the weekend. I didnt even bother too try them but I did take them to the shop with me.And after gabbing for a while I asked "how much 4 em".he said lets trade the two bullets for the one new one! great! then he said that if the speedo was still off too bring it back and we'll try another. I thought cool.In the end trans is filled an still hasnt dripped yet

[midniteblues]

ha forgot pics everybody likes pic's

[VWNate1]

Who's got a link to that chart ? .

My TH350 is reading almost *exactly* 10 MPH too fast.......

I just need a link but any other comments or helps would be great too .

TIA ,

[cpisani70@aol.com]

This thread seems like just what I was looking for, thanx
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[Holliday]

You can get the entire bullet with seals or just the seal from here:

http://www.transmissionpartsusa.com/...-00047338a.htm

Might as well get the whole thing for 5 bucks

[midniteblues]

Originally Posted by Holliday

You can get the entire bullet with seals or just the seal from here:

http://www.transmissionpartsusa.com/...-00047338a.htm

Might as well get the whole thing for 5 bucks

cool thanks for the link..the one i got from the shop still hasnt leaked
but since i did that the kid has taken over that truck
now its sitting out back with no ds window because his ds window regulater broke an he's broke so like a good dad i went an got him another regulater today I got it ...he can put it in

[68gmsee]

Originally Posted by VWNate1

Who's got a link to that chart ? .

My TH350 is reading almost *exactly* 10 MPH too fast.......

I just need a link but any other comments or helps would be great too .

TIA ,

My 68 with a 3 speed saginaw was showing somewhere around 53-55 at 60 mph. With a little luck and doing some reading I got mine right on the money without having to change the drive gear inside the transmission. I just counted the teeth on the driven gear and tried one with the next fewer teeth.

Example; The speedometer reads 66 MPH at an actual 60 MPH. 66 divided by 60 is 110% or 1.1. That means the driven year is rotating 1.1 times too fast. To slow it down, we must increase the number of teeth on it by 1.1. If it is a 40 tooth gear initially, a 44 tooth gear will be correct.

Conversely, if the speedometer is reading too slow, the driven gear speed must be increased, and less teeth on the gear would be required. In John's case, the speedometer was accurate before the gear change and the error caused by the gear change is known. 3.42 divided by 3.08 = 1.11. John needs to increase the driven gear's teeth by 1.11. If he has a 40 tooth gear, 40 x 1.11 = 4.44. Therefore, he would need a 44 tooth gear. http://www.bafb.org/1968firebird.org...articles16.htm

More reading...

http://www.thegearbox.org/catalog/it...82/3697857.htm

http://www.transmissioncenter.net/sp...n_______va.htm

[VWNate1]

Great info ! THANX ! .

[midniteblues]

thank you for the info
i'll havta take hs truck for a ride with a gps too get some real #'s an go from there

that is after he fixes the window

[BlackedOut67shorty]

And I thank you soo much for doing that. Just remember whenever ya need good deals on New parts I'm down the street, oh and the Speedo is more like 15 to 20 miles off, gotta find some time to get that bullet out and take it to the tranny shop. Hopefully I can start on it in the afternoon
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