Transmission shifting / leaking

[gene]

While I was out getting a new muffler, I also got transmission checked. I
did not think it was down shifting correctly and It was leaking into the
spedo cable.

Shifting
He found the 90 degree rubber hose from the vacuum pipe into the modulator
was collapsed. I guess from old age and a tight corner it was almost
closed off and when vacuum was applied, it did close off. The modulator
was ok the hose was bad. You might want to check yours.

Oil in the spedo Cable.
There should never be transmission oil in the spedo cable. He says this is
a common problem with these transmissions. There is a small seal in the
assembly that goes into the transmission for the speedometer pick off.
This seal in mine was cocked from some previous work. This is not the O
rings, but a seal. If you have a leak at the spedo cable, you might want
to check this seal.

gene

Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/

 

[gene]

While I was out getting a new muffler, I also got transmission checked. I
did not think it was down shifting correctly and It was leaking into the
spedo cable.

Shifting
He found the 90 degree rubber hose from the vacuum pipe into the modulator
was collapsed. I guess from old age and a tight corner it was almost
closed off and when vacuum was applied, it did close off. The modulator
was ok the hose was bad. You might want to check yours.

Oil in the spedo Cable.
There should never be transmission oil in the spedo cable. He says this is
a common problem with these transmissions. There is a small seal in the
assembly that goes into the transmission for the speedometer pick off.
This seal in mine was cocked from some previous work. This is not the O
rings, but a seal. If you have a leak at the spedo cable, you might want
to check this seal.

gene

Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/

 

[gene]

He replaced that nylon tube/gear on mine also. Said it was a little worn
at the end of those groves.

My seal was gray, but I think it is the same one. it presses inside the
removable assembly and is held in with a snap ring.
He said there should be a little resistance on the nylon tube , showing the
seal is tight on the shaft.

gene

>In a message dated 2/24/00 5:58:22 PM Mountain Standard Time,

>
> There should never be transmission oil in the spedo cable. He says this is
> a common problem with these transmissions. There is a small seal in the
> assembly that goes into the transmission for the speedometer pick off.
> This seal in mine was cocked from some previous work. This is not the O
> rings, but a seal. If you have a leak at the spedo cable, you might want
> to check this seal. >>
>
>Gene - I just had to replace the nylon gear and saw that it had sprial
>grooves that are supposed to move oil back into the unit when it turns. Is
>the seal that you are describing the little green (on mine) seal at the end
>of the shaft where the speedometer cable screws onto the unit?
>
>Emery Stora
>77 Kingsley
>Santa Fe, NM
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/