bunching speedometer

[Ole BlackBetty]

ok I read a few threads, but did not give me answers.
At 60mph and above my speedometer needle bounces violently. I do have a flashing od light. trans pulls and drives good tach is steady. I clear the od light everyonce in awhile and after driving up to temp. it will come back on. Trans temp runs about 155 on interstate at 65mph.

 

[Clb]

Yes
And
???
Details
Tranny needs p.m.
Speedo electric or cable?
94 should be electric I think on slushbox so speed sensor or gauge...

 

[u2slow]

If it's electric signal, check rear the diff. The tone ring could be damaged, loose, or metal debris is rolling around in there. (Seen it happen before.)

 

[Ole BlackBetty]

Yes
And
???
Details
Tranny needs p.m.
Speedo electric or cable?
94 should be electric I think on slushbox so speed sensor or gauge...

im thinking tranny needs a new convertor at the least. as far as elec. or cable IDK. i know it drives fine, runs fine but needle is dancing past 60

 

[Old Goat]

My 86 bounces around also, and it is Cable driven.
Even with my new OEM Spedo 6 digit head, it bounces around.
It has to be the old cable doing it. The cable runs off the T-19 in
my case, and thinking I need a new one, most likely the original.
And being 39 yrs old and 365K miles, cable probably rotated a few
times inside the sheath.


Goat

 

[u2slow]

OP is showing a 92-97 truck in his avatar. On that detail, I suspect it's an electric speedo.

 

[Clb]

its a 94

 

[Clb]

My 86 bounces around also, and it is Cable driven.
Even with my new OEM Spedo 6 digit head, it bounces around.
It has to be the old cable doing it. The cable runs off the T-19 in
my case, and thinking I need a new one, most likely the original.
And being 39 yrs old and 365K miles, cable probably rotated a few
times inside the sheath.


Goat

lube from top down????