Restoring Rusty

[Gregski]

after raising the rear end of the truck sky high to prevent any seapage, we snuck up on the seal and in no time she was out

[Gregski]

not exactly mangle free but we don't care it's gettin replaced anyway, plus its been in there for over 30 years

[Gregski]

four dollars and thirty one cents later we were the proud owners of a brand new replacement seal part number 15041 made in Mexico

[Gregski]

hold still for a comparison shot, old part number 15404

[Gregski]

of note is this keep things tighty thighty spring that hides inside the metal housing and clasps the rubber seal tight, present on both seals the old one and the new one, I yanked it off the old one to show you all

[Gregski]

now to the untrained eye this may look like a used clutch fork and release bearing...

[Gregski]

but a Certified SemiPro Shade Tree Technician CSPSTT knows exactly where we are going with this

yeah it's the perfect output shaft seal pressure inner thingie tool

[Gregski]

and in what seemed like no time at all, the much lesser known Seal Team 5 had the new output shaft seal pressed in and ready for action

test drive done, and Leakage Report at 11

[flashed]

Now we have been schooled by the Greg ,good deal .But Chevy's still seem to find a place to leak just to give us something to do.

[enaberif]

Chevy's don't leak .. They just mark their territory.

[Woodyboat]

Originally Posted by enaberif

Chevy's don't leak .. They just mark their territory.

My Harley has that same attitude.

[rich weyand]

Chevy's don't lose oil. You always know exactly where it is.

[Gregski]

hey bro how did that output shaft seal repair turn out? did it stop the leak man?

tough brake bro, tough brake!

[Gregski]

well the good news is the new output shaft seal area be dry as a bone

another job that needed not be doin' done right! know what I'm a sayin' folks? ha ha

[Gregski]

hey man is you even sure that's where it was a leakin' from in the first place, I mean what else have you done with that there new(er) transmission, sometimes guys replace the speedo cable and put it in just hand tight and forgit' to tighten it all the way with some TOOL, just sayin' bra, not saying that could possibly be the case here, but you know you may wanna crawl under that rig with a light and take a looksie

oh by the way try crawlin' under from the driver side, there's a bit more clearance on that side minus the gas tank and all, I've noticed you put on a few pounds lately on the account of the Soft Serve Season, just sayin' bro just sayin'

[deejaaa1]

well just dang it! sounds like some of my projects. fix one thing that ain't even broke.

[Gregski]

so the saga of the leaky transmission continues, though as you shall see the hand tight speedo cable was not the problem

after further investigation the leak does come from the speedo gear housing, so it was time to yank it out, not only to fix the leak but to see if we can replace the speedo gear with one that is a bit more accurate, as my truck says I went 6.5 miles for every 6 I actually drove (tested with another vehicle)

it appears I have a 40T tooth gear, so with it being 8% off I think I need the 43 tooth one.

6.5 divided by 6 = 1.08

40 teeth times 1.08 (carry the circumfrance of the earth) gives us 43.3333333333333333333333333333333 approximately

[hatzie]

Looks like your MY6 uses a similar speedometer gear carrier to the NP208 in my 76 & M1008 and some, but not all, TH350 & TH700R4 from that timeframe.
There's an O-Ring round the large part of the housing and a seal around the cable end of the gear. Either one can leak but usually it's the seal inside the threaded end around the gear stem.
http://www.ebay.com/itm/like/1511809...&ul_noapp=true
I believe part #s are as follows
12440382 SEAL, SPEEDO DRIVEN GEAR (the orange seal in your pic)
1361618 OIL SEAL RETAINER, SPEEDO DRIVEN GEAR (C-Clip in your pic)
I believe it's # 326563 SEAL, SPEEDO DRIVEN GEAR SLEEVE (Black o-ring in the gear carrier)

You can find the orange seal online and probably locally.

The GM 43 tooth driven gear is Purple and probably around $25.
More than you want to know about speedo gears in the 73-87 trucks. http://www.73-87.com/7387garage/drivetrain/speedo.htm

[Gregski]

Originally Posted by hatzie

Looks like your MY6 uses a similar speedometer gear carrier to the NP208 in my 76 & M1008 and some, but not all, TH350 & TH700R4 from that timeframe.
There's an O-Ring round the large part of the housing and a seal around the cable end of the gear. Either one can leak but usually it's the seal inside the threaded end around the gear stem.
http://www.ebay.com/itm/like/1511809...&ul_noapp=true
I believe part #s are as follows
12440382 SEAL, SPEEDO DRIVEN GEAR (the orange seal in your pic)
1361618 OIL SEAL RETAINER, SPEEDO DRIVEN GEAR (C-Clip in your pic)
I believe it's # 326563 SEAL, SPEEDO DRIVEN GEAR SLEEVE (Black o-ring in the gear carrier)

You can find the orange seal online and probably locally.

The GM 43 tooth driven gear is Purple and probably around $25.
More than you want to know about speedo gears in the 73-87 trucks. http://www.73-87.com/7387garage/drivetrain/speedo.htm

You are my Saviour!!! thank you so much, I just spent an hour at NAPA looking for this stuff and only came away with the large rubber O-ring part number 1-3895 from a TH350 I believe

[Gregski]

Originally Posted by hatzie

...There's an O-Ring round the large part of the housing and a seal around the cable end of the gear. Either one can leak but usually it's the seal inside the threaded end around the gear stem...

I am beginning to think the same thing!

[Gregski]

Originally Posted by hatzie

More than you want to know about speedo gears in the 73-87 trucks. http://www.73-87.com/7387garage/drivetrain/speedo.htm

Nonsense, I love this stuff and you have no idea how much I appreciate you helping me out, thank you very much.

ok so I checked and I have the blue drive gear ie 18 teef so using their formula it validates that I need the 43 tooth driven gear.

18 x 3.42 x (20168/29) = 42.76 or round up to 43

[Gregski]

so while we wait on the speedometer housing seal, o-ring and a 43T tooth driven gear I might as well tell you what else I was up to

couple days ago Pick N Pull had a 50% off sale, so I went a huntin' for a few things and scored a thermo nuclear 7 blade fan for only $12 bucks, which we will clean up, paint and mount some day, for now we just brought it up for show n tell

a kind '78 happened to be the organ donor in this case

[Gregski]

also got some grille brackets off the same truck in case I ever find and or decide to go to a newer style grille, this time they only wanted $6 bucks per bracket unlike that other dude who wanted $16 each or something like that in Chico, CA

these also will be cleaned up, and painted green to match the grille some day, (or maybe black, donno)

shoot I just remembered I should have grabbed the center hood latch support bracket too, as it also be different than my '74, oh well

[Gregski]

now I hate sitting around waitin' for parts and it is a 3 day weekend on the account of Memorial Day and all, so I decided to pull out the 1-1/16 anti sway bar I picked up a few weeks back, also a Pick N Pull score for $30 bucks, the plan is to soak it in acid/water bath to get the corrosion off, than wire wheel it, prime it, paint it cast iron color and the brackets black, and clear coat it, NICE

this one came off of a '79 GMC

TOP TIP: when you go a pullin this thing, bring a battery powered drill to drill out the rivets to get the front brackets, something I did not do thinking they was bolted on

[Gregski]

I got the front anti sway bar brackets from that expensive yard in Chico, CA since I worked so hard to drill the 4 rivets out in the field, I decided to pay the $11 bucks a piece for them, I know my local yard would have charged me half that

these came off of an '84 GMC and I think it had a 1-1/8 sway bar, I don't recall if it was still on when I got to it or if someone already bought it, if I knew it was the bigger kind I would have bought it also, well depending on the Devil's price