Speedometer Adapter
 

I've looked and looked and I can't information on the adapter I need.

I have a 1971 C10, 355, with a 85ish 700R4 transmission. when I bought the truck the previous owner stated I needed a mechanical adapter for the transmission to make the factory cluster speedo to work.

I don't have a pic of the current connection on the transmission at this time but there's a plastic plug adapter on it where i appears to be electronic.

Any advice on where I can get this? A part number? anything....

Re: Speedometer Adapter
 

Why do you need an adapter? On my 200-4R of the same vintage (mid 80s) I needed to extend it by 12" but it screwed right in.

What does the trans have that doesn't match you cable? Not a lot of info to go on here...

Re: Speedometer Adapter
 

http://www.bowtieoverdrives.com/cata....php?ITEMID=19

This is what you need. Probably best to call them to get the correct gears so the speedometer will be accurate. You can also pull this from a used trans in the salvage yard. Your 700r4 is probably newer than 85. The model number is etched into the bottom pan rail and will ID the year.

Re: Speedometer Adapter
 

Simple as removing the electric/electronic speedometer drive and replacing with mechanical.

Re: Speedometer Adapter
 

Thanks guys, i'm going to get the look at the Id tag on trans this evening to confirm the year. Thank you for the info.