Speedo doesn't work (handled)

[HANDM]

I've been dinking with the speedo trying to get it to work, after installing an good, old cable, it still doesn't work.

I've verified that the speedo itself is working by chucking the cable up in my drill and spinning it.

Once hooked up to the tranny it doesn't work........

Any ideas?

[A383Wing]

does cable turn when you are driving it and with it unplugged from speedo?

I'm guessing bad cable or broken speedo gear in trans

[HANDM]

No discernable movement, you're probably right about the gear being toast.

I have a couple spare 727's laying around........looks like I need to do some scrounging

[A383Wing]

before you tear into trans gear....pull the cable off the speedo and then pull the cable out of the casing....see if ya get all of it with square ends on each end....if not, then cable is broke

[HANDM]

Had a busted end on the one, replaced it with a good spare........

[hemi68charger]

Had a busted end on the one, replaced it with a good spare........

[HANDM]

The new old cable is in good shape and spins the speedo just fine while chucked up in my drill, when driving though, it doesn't work.....

[nascarxx29]

That just leaves one of 2 gears to checkout .Just slip cable out of its housing and see how it fits in tailshaft plastic gear opening

1.Is easy right on tailshaft where speedometer cable screws on theres a removable housing with o ring.

2 The other remove tailshaft.Drop drive shaft remove crossmember etc etc rubber mount and snap ring pliers tail shaft slides off

[HANDM]

Thanks, How much fluid can I expect to spill out of the tranny when I yank the pinion/ adapter?

I am also suddenly having trouble with the tranny not downshifting to first when I am stopped, I know that it is either a faulty governor or a sticking 1-2, 2-3 valve body or whatever.....

Question is, this being a newly rebuilt (ten years ago, never ran) is there some additine that may free up the governor or shift valves or whatnot?

Thanks again 

[HANDM]

I just got through replacing the pinion and the speedo now works, I am unsure about the accuracy as it it raining right now, but I will let you know how it is

[John_Kunkel]

You replaced the speedo pinion...what was wrong with the old one? if it was damaged, the plastic might have gravitated to the governor to cause your shifting problem

You need to know the tire diameter and axle ratio to determine the correct speedo pinion.

[HANDM]

I suspect that may be the problem.....the pinion that I yanked out was/ is trashed, all of the teeth worn down smooth. Like it wasn't seated properly.

If I can cough up the dough, I need to drop the pan, drain the converter and see what all is going on.....

[John_Kunkel]

Dropping the pan won't give you access to the governor, it's in the tailhousing.