1996 E350 based 21 feet Class C with a 460 ( 7,5L )....
the speedometer fluctuates around 60 mph & over ......the cruise control wont hold because of this ... ABS light on also !

Id like to know what is causing this :
I know the oïl is new in the diff and the abs ring teeth are good , connector ok too.( tried another one also same results )
I heard about cluster ....
is it normaly the most obvious reason ? any hints ?
thanks

Dan

 

The fact that the ABS light is illuminated means there should be a code in the computer to provide some guidance as to where the problem is originating.

 

athnks Hanky,
the 96 does not have OBDII .......how can I get the codes?
thanks
Dan

 

The codes are still available, some code readers will read OBD I .
There is another way and that requires a voltmeter and using the diagnostic plug and following a specific procedure. With the second method you count the blinks of the check engine light and refer to a code listing to get the description of the code. The procedure is probably available over the internet .It is much better to watch a video than to try to understand the writings of someone trying to explain it.

 

thanks hanky

ill check because I dont think i have a check engine light on

 

You would then watch the deflection of the needle on an Analog voltmeter and count the times the needle rises and falls.