TAC Tech > Mechanical
Correct speedometer cable for 79 400 with Super T10 4 speed.
Seven:
What is the correct length speedometer cable for a 79 400 4 speed?
b_hill_86:
Exact length? Not positive but I believe 80” is available and will work. I want to say the cruise version of the lower cable is 60-something inches.
wheels78ta:
GM #88959477 replaces GM #25033161. I haven't found any measurements for #88959477 so not sure about the length.
https://www.ebay.com/itm/166224599245?autorefresh=true
nUcLeArEnVoY:
Many '79 400 4-Speeds were equipped with a two-piece speedo cable, with a Stewart Warner brand reducer gear in between them. That's how mine is.
I do know that the lower cable that goes from the trans to one side of the reducer is around 17" or so, and the part number is 6480244. I grabbed a NOS AC one when I had to replace my speedo cables.
The upper cable that goes from the other side of the reducer to the speedo itself, I forget the GM part number but the Pioneer CA-3009 is a direct replacement.
I can check to see the type of reducer I have as well, if you like.
Seven:
I'm finishing up an engine out mechanical refresh on the front half of the car. It has a two piece cable in it, however its much too long. There's a big loop in it and the gauge bounces at low speed. I'd definitely like to replace both the upper and lower portions as long as I'm this far into it.
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