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Author Topic: Bouncing Speedometer...  (Read 1149 times)

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Offline bigbadjer05

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Bouncing Speedometer...
« on: February 20, 2011, 12:33:59 AM »
So i got fed up with the busted speedometer in my 86, so i swapped it out with one out of an 87... rebuilt the cable put everything back together... drove it down the road and the speedometer bounces around +/- 10-15 mph. Is there a fix for this or is this speedometer just doomed aswell?
86 Dodge W100, reg cab short box, 4" lift, 35" GoodYear Wranglers, 318 "interceptor"/727

79 Dodge D100, reg cab short box, 33" BFGs, 440/727

78 Dodge Aspen, 2dr soft top, slant 6

Offline 81Rustbucket

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Re: Bouncing Speedometer...
« Reply #1 on: February 20, 2011, 05:45:44 AM »
IIRC, and I may be wrong on this...but in the speedometer there is a magnet that runs the indicator and the cable runs 2 magnets orbiting it, if you will.  I've never heard of a home rebuild, but I'm sure there are companies out there that can.
1981 Ramcharger 4x4 318 727/NP208

Offline pir2

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Re: Bouncing Speedometer...
« Reply #2 on: February 20, 2011, 07:13:08 AM »
Is the cable well lubed?
No tight turns or bends in the cable?
Do you have cruise?  If so it could be the second cable that needs attention.
87 W150 87 W250 87 B350 88 Dakota  03 Chrysler Intrepid  2014 Challenger SXT

Offline Mopar1984

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Re: Bouncing Speedometer...
« Reply #3 on: February 20, 2011, 08:16:11 AM »
I had the same problem I have the cruise so I took off both cables and took the wire out of the inside and greased them both put it all back together. And its been about 2 months and it works like brand new
1983 Ramcharger 360, 4 speed, 600cfm edelbrock, performer intake, msd 8mm wires, mopar performence ignition, dual flowmaster exhaust, 4' skyjacker soft ride lift, rancho shocks, dual steering stabilizer, MT rims, 35" BF Goodrich all terrian, birdbath hood conversion

Offline Ram86360

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Re: Bouncing Speedometer...
« Reply #4 on: February 20, 2011, 11:01:29 AM »
Is there a speedometer cable available if you removed an inoperative cruise control. Basically is was broken and I romoved it and want to run the cable without the unit....
1986 Ramcharger 4WD 360

Offline ChrisKD

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Re: Bouncing Speedometer...
« Reply #5 on: February 20, 2011, 11:29:04 AM »
Is there a speedometer cable available if you removed an inoperative cruise control. Basically is was broken and I romoved it and want to run the cable without the unit....

Yep, order a Cable for the same model truck, without Cruise Control.
76 Ramcharger 318/727/203
48 Dodge Pickup
83 Scamp GT 2.2 Turbo AWD
92 Dakota 5.2/518/231
84 PW50 273/727/100/203
74 Duster 6-71 Blown 340/833/D60
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73 Dart Sport 340/833/8.75
73 Dart Sport 340/727/8.75
71 Duster : Viper V10/6-Speed/8.75
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Offline bigbadjer05

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Re: Bouncing Speedometer...
« Reply #6 on: February 20, 2011, 11:38:18 AM »
No cruise control on this one... I lubed up the cable with grease before i put it back together, it moves in and out freely and theres no sharp bends in the cable... sounds like the magnets then...
86 Dodge W100, reg cab short box, 4" lift, 35" GoodYear Wranglers, 318 "interceptor"/727

79 Dodge D100, reg cab short box, 33" BFGs, 440/727

78 Dodge Aspen, 2dr soft top, slant 6

Offline ToxicDoc

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Re: Bouncing Speedometer...
« Reply #7 on: February 20, 2011, 09:07:56 PM »
Remove the gear at the T-case/tranny and make sure the drive gear or driven teeth aren't broken.  If those are good and you're certain the cable is good, time for a new/rebuilt speedo head.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

 

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