cnbark
07-23-2002, 06:49 PM
RE: 1961 Buick Electra 225 Dynaflow:
Does anyone know where I might get the unit that is in the transmission that the speedometer cable plugs into? There is a 19 tooth plastic gear on the end which is all worn. I understand that this part is the same for 1961-1963 Dynaflows. Thanks.
There is a transmission parts supply house that advertises individual parts availability for older transmissions. The name is Northwest Transmissions, I think. They advertise in Hemmings Motor News quite a bit. I can dig up a phone number if you need it.
Occasionally new old stock parts like this will turn up on ebay.
Another avenue might be an old time speedometer repair shop, probably in one of the larger cities.
I tried a quick look in The Buick Farm's listings without success, but a more thorough search might turn up something there.
The part is a Gear and Shaft Assembly, Speedometer Driven #1164318. The mounting sleeve, seals, and retainer come with the gear. This one has 19 teeth. Some other similar parts had anywhere from 17 to 21 teeth depending on axle ratio, tire size, carb, car series.
cnbark
08-17-2002, 08:16 AM
Todd:
Thanks for your reply to my question about the speedometer gear. I'll try those sources. Would you happen to know the specifications of that plastic gear- or where I might find this info? My machine shop guy says he can make the gear if I can get the specs.
Thanks ,again
CNBark
CN, I haven't turned up the official answer yet, but there are indications it is nylon. In one GM parts list, it says the plastic speedometer driving gear used on 62 Specials was made of Nylon. The 61 shop manual says the upper cable tip that inserts into the speedometer head is made of Nylon.
Another possibility is a plastic called Delrin. It is the material used for the liner of the cable housing on the 61s. Looking it up on the web shows it to be a material similar to Nylon.
I will poke around some more and advise of any discoveries. My guess is the plastic is intended to be the sacrificial material in case the cable chews up and locks up inside the housing. The driving gear on the transmission output shaft (except as noted above) is made of steel.
cnbark
08-27-2002, 07:08 PM
Todd;
Good news! Your lead of Northwest Transmissions paid off! They had a used unit that is in very good shape. I will install it soon and let you know how it works out.
Many thanks for your efforts.
CNbark