727 speedo gear housings?

on a small block 727a speedo gear housings...are there different types...like length,size etc...i swapped a speedo housing and gear from one trans to another and with out removing it to look further..i would like to know if there were different sizes..because now it dosn't work or spin while in gear...what's the chances of the rebuilt trans with no inside gear?...just want to ask before i get underneath and look...

I am not sure what you are calling a housing but the retainer that holds the gear in the tranny has marks on it for the differnet size gears. Install the retainer in the worng location and the gear will not mesh or it will not go in uness it is forced anf then it is damaged. I may be completely missing you question but I tried.

i remember seeing different numbers on the housing...but which way do i point it to?

There is a little raised mark on the tranny at the bottom of the hole. Line it up with the knotch on the retainer that coresponds with the number of teeth on you gear. If you have it right the gear and retainer will slip right in with no problem. It is funny because I replaced the gear in my 904 tonight. It is simple. I have done them in 727s as well.

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...what's the chances of the rebuilt trans with no inside gear?...

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zero

The gear that drives the plastic speedo gear is just a section of the outputshaft with teeth cut on it.