Speedo & Cruise problems

[fireman438]

I'm starting a new thread 'cause I have a different set of Q's. My speedo reads erratically, for one. I replaced the driven gear at the end of the cable going in to the T-case, but I'm still having problems. i removed the cable from the t-case and felt the drive gear on the output shaft and it feels like there is a convexity to it. Is that a plastic or metal drive gear? And, is it normal for the two gears to wear out at the same time, if the drive gear is plastic?

As for the cruise, id doesn't work either, although I have confirmed power to the vacuum dump valve. i also think it's because the cable speed is too erratic and the speed sensor can't pick up such an erratic reading. Anythoughts?

Rich

 

[adam g]

Don't know about the cruise, I still need to get around to looking at mine. Did you lube The speedo cable when you put it back in. A little white lith grease has done wonders everytime I run into a jumpy needle. If you take the gauge cluster out you can remove the cable from the housing check it for frayed cable and lube it when you put it back in.

 

[fireman438]

I had the cable out before i figured out it was the driven gear, and it seemed to be lubed lightly to me, with no frays whatsoever. I did not lube either of the cables (the one from the speed sensor and the one to it) since they seemed to be ok in that dept. I have chucked the end of the driven gear in to my drill, but since my drill only goes 35 mph, I don't know what the speedo does at higher speeds. All the way up to 35 with the drill though, it doesn't jump or read erratically at all. That's why I wondered about the drive gear being metal or plastic and possibly having a convexity worn into it after 300,000 + miles. I'm thinking I may be working on my truck tomorrow, but we'll see how that goes.

 

[fireman438]

well, i screwed with my speedo gear again the other day and now i noticed that it reads half speed (going 30, reads 15) but without the former jumpy needle. I'm stumped!!

Rich