Ever seen these before?

[67sss]

parting out a 69 1 ton and pulled the guage cluster and there was a clamp type thingy on the end of the speedo. The threads weren't stripped, so why would this be on there? Then on the tranny, there's this blue canister hooked to the vacuum line, I think, what is that for? Thanks.

[Longhorn Man]

The cable thing may be a repaired cable... a generic length that you chop to size, then clamp on the end.
That's just a guess.

The deal on the tranny... that looks like a huge vac modulator to me.

[Tropical Snowstorm]

Agreed on the speedo cable and the tranny looks like an auxilery filter if I had to guess.

[truckdude239]

a huge vac modulator

[Green Machine]

Older original style vacuum modulator on the turbo 400. Pretty common, but most were painted black.

[67sss]

400 turbo behind a 292, must be common on 1 tons. thanks!

[woodridge]

My guess on the speedo would be a anti-tamper device used to keep drivers from unhooking the cable and then driving the vehicle for their own use.
Second item is a modulator valve.

[Robert1970C20rstbukt]

Yep, the 400 in my truck has one of those old style modulators. The new replacements are small and look way different. I've never seen one of those speedometer things before though.

[qksilver]

I have seen those on school buses in the junk yard. I would have to guess that it is an anti-tamper thing

[local13hutch]

Definate anti tamper for dealer warranty-mileage,Old style....