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Selectospeed filter location

A

Anonymous-0

Well-known Member
Bought a used, hopefully good SOS transmission.
Trans is stamped 871, s/n 79733. Casting numbers are 312259, cwc, c59.
Question I have is where filter is located.
All info I have found points to the filter being under top cover, but with cover removed there is no filter, Tube that would normally go to the filter goes from top of shift manifold to down along same side. Did some SOS trans have no filter or filter in different location?
Thanks,
 
Someone has replaced yours with a tube assy off of a 65 and newer trans. they had a filter in the side of the housing instead of under the cover and easier to replace.
 
Alternatively, you could nave a tube from a very early S-O-S, or even an early trans. Is it DDC (no coasting gears) equipped?

In any event, you may wish to salvage a filter compatible tube/manifold (or perhaps cut yours) in order to install a filter.

Dean
 
No.

The 65 and later S-O-S transmissions have a filter cover plate on the left side near the front held in place with four bolts. The full flow filter inside is much larger than that used in the early transmissions, about the side of the engine oil filter. Overall, a MUCH better system

Your transmission casting does not have this filter cavity.

Dean
 
So you are telling me the early sos transmission did not have a filter? The gear selector decal has the red marks---- meaning no coaster gears?
Thanks,
 

Yes, my understanding is that the early SOS transmissions didn't have filters. (But, I'm not sure about that!)
 

Yes, my understanding is that the early SOS transmissions didn't have filters. (But, I'm not sure about that!)
 

Yes, my understanding is that the early SOS transmissions didn't have filters. (But, I'm not sure about that!)
 
Yes. Very early S-O-S transmissions did not have an internal filter.

The red hash marks mean it (at least originally) is not a later DDC version unless it has been retrofitted. The easiest way to know with certainly is to see if it will cost downhill in the gears with the red hash marks.

Dean
 
(quoted from post at 13:27:59 01/06/10) Yes. Very early S-O-S transmissions did not have an internal filter.

The red hash marks mean it (at least originally) is not a later DDC version unless it has been retrofitted. The easiest way to know with certainly is to see if it will cost downhill in the gears with the red hash marks.

Dean
Click to expand...

The easiest way to know is his casting number, 312259. That tells you it's an early transmission with the overrunning clutch.

I have, however, run across one exception to this. Apparently an old case with that number got stuck in the cobwens and resurfaced when they were making the C0NN-7006-B with the DDC. It got the internals of the DDC and was used in production on a '63 4000.
 
The early SOS did not have a filter. It has a strainer that is a part of the drain plug on the lower left side of the transmission and is held in by a tab with a bolt retainer. Pull it out and clean it and replace before filling with clean oil.

The later SOS that did have a filter was mostly for looks or like a security blanket! Once the little filter got dirty it was spring loaded to be pushed off it's seat so the oil could conitnue to flow from the manifold etc. Really not worth removing the cover to replace in my opinion. Juat made the engineers feel a little less guilty for ever inventing such a piece of junk.

Zane
 
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