Author Topic: Speedometer Question  (Read 4562 times)

lorirobin

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Speedometer Question
« on: April 29, 2016, 19:18:17 »
I have a 71 280SE 3.5 which had a 3.69 rear differential which I changed to a 3.27 from a 280SE 4.5.
Now the speedometer reads low along with the odometer.
Instead of having the speedometer re-calibrated could I install a speedometer from a 280SE 4.5
which should correct the problem. My understanding is Mercedes calibrated the speedometer to the
rear differential ratio. I guess I could just live with it, but I'd rather not.
Comments, suggestions?
Thanks,
Jeff

homerj40

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Re: Speedometer Question
« Reply #1 on: January 12, 2017, 01:38:28 »
Hi Jeff,

Have you talked to North Hollywood Speedometer? They specialize in VDO work on classic cars, they might be able to recalibrate it.

http://www.nhspeedometer.com/directions/

Good luck,
Darren

Benz Dr.

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Re: Speedometer Question
« Reply #2 on: January 12, 2017, 03:53:55 »
The 3.5 coupe has gauges like a 113 and the 4.5 has 108 gauges which are not the same at all. It may be that parts are interchangeable.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

450sl

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Re: Speedometer Question
« Reply #3 on: January 12, 2017, 11:32:04 »
The correct ratio should be  (inkt) stamped on the back of the gauge ...........