W123 Diff change and speedometer question - PeachParts Mercedes-Benz Forum

barry123400 · #1 06-07-2009, 09:43 PM

Thought the first year of the electric speedometer was 1985 123s.. Glad to be wrong. Maybe I was thinking of the 126 series?

I was pretty sure all prior to 1985 123s where mechanical anyways. Any 123 turbo with a 307 will be mechanical I suspect. So you should be good to go.

My 1977 300d with a 3.47 sounds a little busy on the highway but the two 616 models with their 3.69s are worse.

DeliveryValve · #2 06-07-2009, 09:45 PM

Quote:

Originally Posted by 79Mercy

I want to say that the 83 300TD speedo is though, correct?

That would be the 1981 300TD that had the electric speedo.

Quote:

Originally Posted by barry123400

Thought the first year of the electric speedometer was 1985. Glad to be wrong. Maybe I was thinking of the 126 series? I was pretty sure all prior to 1985 123s where mechanical anyways. Any 123 turbo with a 307 will be mechanical I suspect.

All 126s had the electric speedo.

barry123400 · #3 06-07-2009, 09:53 PM

Actually this is great news. Now the hunt starts for a 1985 differential and speedo head. I want a 2.88 rear end for one of my turbos.

Squabble · #4 06-08-2009, 06:38 AM

just to clarify, if you want to update the diff, you have to match the speedo out of the same donor car/year, correct? i thought i saw a thread by deliveryvalve showing how to adjust your speedo to avoid this, if it is a problem... i too want the diff and speedo out of an 85 300D someday.