Speedometer Gear Leaks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SKELLEY · 08-21-2007, 10:16 AM

I Have A 71 Lwb K10 With A 350 4sp Manual And A New Process 205 T/case. The Speedometer Gear Leaks Like A Siv (whatever A Siv Is?). I Took It Apart And There Is No O Ring Or Inner Seal Whatsoever. Are These Available Anywhere - Someone Help Me Please::
Sean

woodridge · 08-21-2007, 10:36 AM

Two things that usually cause these to leak are over-filled gear box and or a worn housing or gear. If you noticed, the gear shaft is spiral cut and this constantly pulls the grease away from the cable end. Any wear will cause it not to work very well or not at all. The housing and gear should still be available from GM.

Aarons72s · 08-21-2007, 10:39 AM

There should be an o ring on the outer housing and a press in seal that the spedo gear slides thru. The o ring should be easy to find but you will have to go to napa or oreillys for the inner seal. I have had to replace both on my green and white with th350.

timcos · 08-21-2007, 11:20 AM

A sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods

SKELLEY · 08-22-2007, 07:27 PM

Thanks, I Never Knew What A Sieve Was Or Ment! And Of All My Internet Search I Never Thought To Ck With Napa! I Would Rather Get The Housing And Gear From Gm - They Seem To Hate To Look Up Old Parts. Anything With Less Than A 17 Digit Vin Is A Pain! She Aint Overfull As It Will Lose 2 Qts In A Month! Yikes

**jerry moss** · 08-22-2007, 10:00 PM

Somewhere In My Vast Inventory (aka-mess) Of Papers, I Have The Name Of A Company That Rebuilds Those Things. They're 35+ Years Old And Most I've Seen Leak At Least A Little Bit.

SKELLEY · 08-26-2007, 11:37 AM

I AM A LITTLE CONFUSED-IF IT IS SUPPOSED TO BE SPIRAL CUT THEN MINE IS WORN BEYOND RECOGNITION. IT LOOKS LIKE IT SHOULD HAVE A SEAL BUT NONE EXISTS. AND LAST - IF THE NP 205 IS THE BULLET PROOF T/C THAT EVERYBODY WANTS AND SO MANY ARE REBUILT AND ADAPTED TO QUADS THEN WHY CANT I FIND ANYTHING ON SPEEDOMETER GEARS (DRIVEN GEAR AND HOUSING) - DO THESE PEOPLE JUST CAP THEM OFF AND FORGET THEY NEED A SPEEDO? I AM SORRY FOR WHINING

BUT THIS IS DIFFICULT. I HAVE NEVER RUN INTO A PART I COULDNT FIND FOR MY 56 BEETLE! Y'ALL HAVE GIVEN ME INSIGHT THOUGH AND I AM SURE WE WILL FIND THE ANSWER

72freak · 08-26-2007, 01:13 PM

Quote:

Originally Posted by SKELLEY

I Have A 71 Lwb K10 With A 350 4sp Manual And A New Process 205 T/case. The Speedometer Gear Leaks Like A Siv (whatever A Siv Is?). I Took It Apart And There Is No O Ring Or Inner Seal Whatsoever. Are These Available Anywhere - Someone Help Me Please::
Sean

I thought they were supposed to do that..........I have owned 150+ GM products and I think 149 of them leaked there.

SKELLEY · 08-27-2007, 05:04 AM

I dont care about a little leak - but - man this thing loses 2 qts a month and I dont drive every day!

**Green Machine** · 08-27-2007, 10:53 AM

I've fought that gear leaking thing on many GM vehicles that I have had over the years. Seems that there are two style available. Gm used the ones without a seal on many manual transmissions. I guess they figured the heavier grease would not leak out ? (wrong). Get an adapter from a Chevy Turbo 350 automatic, the smaller style, (not the big 400 style), best to get a new one if you can. If getting a used one, check the inside bore for any wear, replace inner seal, put the clip back in over it and a new O ring on the outside. Get a new gear if it has any wear at all, might have a groove worn at the seal area, and you have done all that you can do.

mrein3 · 08-27-2007, 01:01 PM

Quote:

Originally Posted by timcos

A sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods

Or if you are a Gopher hockey fan, this is a sieve...

So.Cal.Super · 08-27-2007, 03:23 PM

Mine leaked untill I replaced the Gear itself. The trans shop pointed out the nice groove that had worn itself all the way around. no more leaks now.

SKELLEY · 09-01-2007, 08:25 AM

Well now, while surfing this site I found someone who had a link to a site that actually had the exact repair = see http://www.norcalbigdawgs.net/Gallery/album49
I dont think I am still losing gear oil - time will tell. Still drips but I think it is because the ratio adapter and speedometer cable were full of gear oil!
Thanks for all the help

mfarmer · 09-01-2007, 09:52 PM

Good information....

Twistedsteel · 09-02-2007, 03:08 PM

Sweet I gotta get me one. I just gave up puttin oil in mine, it's probably a couple quarts low too. I've tried everything to fix it. I can't wait, it'll be like havin a new truck again

08-21-2007, 10:16 AM	#1
SKELLEY Registered User Join Date: Aug 2007 Location: ROANOKE VA Posts: 6	Speedometer Gear Leaks I Have A 71 Lwb K10 With A 350 4sp Manual And A New Process 205 T/case. The Speedometer Gear Leaks Like A Siv (whatever A Siv Is?). I Took It Apart And There Is No O Ring Or Inner Seal Whatsoever. Are These Available Anywhere - Someone Help Me Please:: Sean

08-21-2007, 10:36 AM	#2
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	Re: Speedometer Gear Leaks Two things that usually cause these to leak are over-filled gear box and or a worn housing or gear. If you noticed, the gear shaft is spiral cut and this constantly pulls the grease away from the cable end. Any wear will cause it not to work very well or not at all. The housing and gear should still be available from GM. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet

08-21-2007, 10:39 AM	#3
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,670	Re: Speedometer Gear Leaks There should be an o ring on the outer housing and a press in seal that the spedo gear slides thru. The o ring should be easy to find but you will have to go to napa or oreillys for the inner seal. I have had to replace both on my green and white with th350.

08-21-2007, 11:20 AM	#4
timcos Chief Honcho In Charge Join Date: Aug 2006 Location: Bentonville AR Posts: 970	Re: Speedometer Gear Leaks A sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods Attached Images __________________ 1992 1500 4x4 Shortbed 1984 Ford F250 Supercab Longbed 6.9L Diesel 1972 K10 Cheyenne Super Fleetside Short Bed - 350 - A/C 1971 VW SuperBeetle 1960 Wife 1984 Son 1986 Son 1989 Son Previous Trucks 1967 C10 SWB (1980-1981) 1971 C10 LWB (1998-2004)

08-22-2007, 07:27 PM	#5
SKELLEY Registered User Join Date: Aug 2007 Location: ROANOKE VA Posts: 6	Re: Speedometer Gear Leaks Thanks, I Never Knew What A Sieve Was Or Ment! And Of All My Internet Search I Never Thought To Ck With Napa! I Would Rather Get The Housing And Gear From Gm - They Seem To Hate To Look Up Old Parts. Anything With Less Than A 17 Digit Vin Is A Pain! She Aint Overfull As It Will Lose 2 Qts In A Month! Yikes

08-22-2007, 10:00 PM	#6
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,845	Re: Speedometer Gear Leaks Somewhere In My Vast Inventory (aka-mess) Of Papers, I Have The Name Of A Company That Rebuilds Those Things. They're 35+ Years Old And Most I've Seen Leak At Least A Little Bit. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

08-26-2007, 11:37 AM	#7
SKELLEY Registered User Join Date: Aug 2007 Location: ROANOKE VA Posts: 6	Re: Speedometer Gear Leaks I AM A LITTLE CONFUSED-IF IT IS SUPPOSED TO BE SPIRAL CUT THEN MINE IS WORN BEYOND RECOGNITION. IT LOOKS LIKE IT SHOULD HAVE A SEAL BUT NONE EXISTS. AND LAST - IF THE NP 205 IS THE BULLET PROOF T/C THAT EVERYBODY WANTS AND SO MANY ARE REBUILT AND ADAPTED TO QUADS THEN WHY CANT I FIND ANYTHING ON SPEEDOMETER GEARS (DRIVEN GEAR AND HOUSING) - DO THESE PEOPLE JUST CAP THEM OFF AND FORGET THEY NEED A SPEEDO? I AM SORRY FOR WHINING BUT THIS IS DIFFICULT. I HAVE NEVER RUN INTO A PART I COULDNT FIND FOR MY 56 BEETLE! Y'ALL HAVE GIVEN ME INSIGHT THOUGH AND I AM SURE WE WILL FIND THE ANSWER

08-27-2007, 05:04 AM	#9
SKELLEY Registered User Join Date: Aug 2007 Location: ROANOKE VA Posts: 6	Re: Speedometer Gear Leaks I dont care about a little leak - but - man this thing loses 2 qts a month and I dont drive every day!

08-27-2007, 10:53 AM	#10
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Speedometer Gear Leaks I've fought that gear leaking thing on many GM vehicles that I have had over the years. Seems that there are two style available. Gm used the ones without a seal on many manual transmissions. I guess they figured the heavier grease would not leak out ? (wrong). Get an adapter from a Chevy Turbo 350 automatic, the smaller style, (not the big 400 style), best to get a new one if you can. If getting a used one, check the inside bore for any wear, replace inner seal, put the clip back in over it and a new O ring on the outside. Get a new gear if it has any wear at all, might have a groove worn at the seal area, and you have done all that you can do. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

08-27-2007, 03:23 PM	#12
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: Speedometer Gear Leaks Mine leaked untill I replaced the Gear itself. The trans shop pointed out the nice groove that had worn itself all the way around. no more leaks now. __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB

09-01-2007, 08:25 AM	#13
SKELLEY Registered User Join Date: Aug 2007 Location: ROANOKE VA Posts: 6	Re: Speedometer Gear Leaks Well now, while surfing this site I found someone who had a link to a site that actually had the exact repair = see http://www.norcalbigdawgs.net/Gallery/album49 I dont think I am still losing gear oil - time will tell. Still drips but I think it is because the ratio adapter and speedometer cable were full of gear oil! Thanks for all the help

09-01-2007, 09:52 PM	#14
mfarmer Registered User Join Date: Sep 2006 Location: Georgetown, Texas Posts: 97	Re: Speedometer Gear Leaks Good information....

09-02-2007, 03:08 PM	#15
Twistedsteel Registered User Join Date: Feb 2005 Location: Redway, Ca Posts: 97	Re: Speedometer Gear Leaks Sweet I gotta get me one. I just gave up puttin oil in mine, it's probably a couple quarts low too. I've tried everything to fix it. I can't wait, it'll be like havin a new truck again



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.