A-999 Swap and Information

Here are the non-lockup 999 PK#s which can be found on the driver's side pan rail:

'74-'75 3681844
'76-'77 4028465
'78 4028878

(PK#s starting with 44 and up are from the '80s.)

The above units were found behind 360 powered passenger cars as a 'heavy duty' version of the 904. '78 was the first year they went to a lockup trans so if you have one of those units, you would want to look at the end of the input shaft to see if it has the machined tip on the end.

Pretty much anything from 78-up was a lockup if it was in a passenger car, however, it's my understanding that some trucks and vans after '78 may have recieved a non lockup 998-999. Those are probably harder to find than the pass car ones. I mean how many 360 powered trucks or vans had a 904 in them?