81 Auto/Tranny Output/Tail Seal?

[HammerDown]

Anyone got a part number for a SKF seal...auto?
Also, I'm guessing the output 'bushing' can't be replaced with the trany in the car...correct?

 

[frank_nesta]

I am assuming that you have a 700R4 transmission. I bought one of these.

Rear Extension Tail Housing Teflon Bushing Seal Kit TH350 4L60E 700R4 MD8 M30 | eBay

You can do this with out removing the transmission. You have to remove the speedometer gear then the tail shaft housing. Be prepare for some transmission fluid to come out.

 

[HammerDown]

I am assuming that you have a 700R4 transmission. I bought one of these.

Rear Extension Tail Housing Teflon Bushing Seal Kit TH350 4L60E 700R4 MD8 M30 | eBay

You can do this with out removing the transmission. You have to remove the speedometer gear then the tail shaft housing. Be prepare for some transmission fluid to come out.

Thanks for that, I believe I have the TH350 which appears to take the kit you listed!
And by the size of that O-Ring, the tail shaft would be small enough to slip right past the cross-member

 

[frank_nesta]

Yes, it looks it will work.

Let us know how it works out.

 

[Peer81]

Remove the drive shaft. Then remove the tail piece of the th350 and replace the seal on the workbench.

Greetings Peter

 

[HammerDown]

Sure looks like a tight fit to get it out...I ain't messing with that cross member when it's up on jack stands!

 

[HammerDown]

Remove the drive shaft. Then remove the tail piece of the th350 and replace the seal on the workbench.

Greetings Peter

Nope, and as I suspected the tail extension will NOT clear the cross-member.
However, it did come back enough to where I could wedge a piece of wood between the cars floor underside panel and the cone to lock it in place.
Knocked the oil seal out...
Be careful of the little speedo plastic drive gear.

Then, I took a very sharp, 1/4" x 3/16" X 8" flat chisel and worked on the outside lip of the bushing. Once curled-up the SHARP chisel kind of split the bushing down the center, it then fell into the cone. It was a matter of reaching around and inside the cone to get it and the large o-ring out.
I visited a friends trany shop and he gave me a new bronze bushing, the o-ring and new oil seal...also let borrow his tool for to install the new bushing.

Tomorrow it goes back together.

The only way that tail extension would come all the way out...would be to drop the cross-member and I wasn't doing that with the car on jack stands!

 

[Peer81]

Oke, I was thinking the Th350 would be easier then my 700 as the rear transmount isn't on the tail piece.
No way you can jack the rear of the trans to get the tailsection out? I did the same on mine when the drive gear clip had broken. Good luck and as I see it your doing just fine! Keep it up up:

Greetings Peter

 

[HammerDown]

New O-Ring, bushing and seal installed
As mentioned prior, on a TH350 auto and because of the hump in the floor and the cross-member there is NOT enough clearance to fully remove the tail extension. However, if you need to replace the large O-ring there is enough room to unbolt the tail piece, move it back over the cross-member to fish in the new O-ring...and that's also where I 'carefully' cut the old bushing out.
I cut the bushing with a very sharp chisel, it then fell into the tail-piece to where I could remove it from the inside.
I installed the new O-ring then re-bolted the tail piece to the trany...proceeded to instal the new bushing and oil seal. With the drive shaft out there is plenty of room in the floor-tunnel to do what's needed to do...it just takes some thinking ahead.
BTW don't even think about installing the bushing without the tool pictured...pretty good chance you'll destroy the new bushing.