Help, Question about speedo adapter

[61 vert]

Isn't there a seal that goes inside the speedo adapter on a 57 powerglide?It seals between the plastic speedo gear and the adapter,or am I remembering wrong?I have a leak out of the cable where the nut goes on the adapter.

 

[Impalaguru]

HI Andy!
I think that the powerglide uses the same speedo gear as most GM transmissions from that era, except the TH400, I think. Someone correct me if I'm wrong. If it's like what I think it is there is a steel bullet-shaped housing that the gear fits into. My guess would be that the plastic gear is maybe a little worn. There is an O-ring around the speedo bullet. You can still get the gears from GM. Maybe the iron-glides are different? Best of luck!!!
Ross

 

[61 vert]

I'll ck.

I will go to GM tomorrow and see if they have a replacement plastic gear. It does fit loose in the adapter.I still seem to remember a seal that went into the adapter from the outside, but must be thinking of something else.Thanks, Ross.
P.S.Missed you at the hayride.

 

[gbafus]

It's my understanding that the plastic speedo gear in the cast iron 'glide is about 1/2" longer than the one for the TH 350. The TH350 plastic gear will work in the cast 'glide by making up a speedo cable (just the inner part) that is 1/2" longer.

 

[61 vert]

Thanks

I helped a buddy pull his muncie today and there is a seal that presses in from the outside before the speedo cable goes on. I need to see if they are interchangeable with the one in the p-glide.