Speedometer question

[bnam]

My '74Tii has a 5-speed from a 320i and a 3.91LSD. I finally got my speedo working only to realize that it is off by about 20-25%. Also, the odometer is not working. Is there a speedo that would be a match for this set up? Or do I have to get it recalibrated?

Thx,

Byas

[RayC911]

76 02s and maybe very late 75s had 3.90 diffs. But I think the later style had the cross hair.

Courtesy of CD-

3.90:1 diff -- W=1.39 speedo ('76 49-State 2002)

3.91:1 diff -- W=1.393 speedo (E21 320is LSD)

[bnam]

Is the W=393 printed somewhere on the speedo? I don't have access to my car right now. Mine has the cross-hair style.

Thx!

B

[RayC911]

Yes, they should all have W=1.xx stamped on the back.

[SteveJ]

The speedo's cal'd for 3.64 differential gearing will have a W=1.28 stamped on them. It's in the metal housing near where the speedo cable connects. You may be able to pull the knurled nuts, disconnect the speedo cable, and tilt the cluster forward enough to get a mirror back there to see. Cell phone cameras are sometimes helpful.

[02Les]

Is the W=393 printed somewhere on the speedo? I don't have access to my car right now. Mine has the cross-hair style.

Thx!

B

Here's a pic ot the back of the speedo for you.

[Mike Self]

it's for a 3.64 diff, and you need one for a 3.90--as was stated, a US 76 car will have a speedo with the proper gear ratio. Should be able to find one on the FAQ parts for sale. That should also cure the inop odometer problem.

You can get new odometer gears from Odometergears.com, along with installation instructions. It's a common problem on 2002s--speedo works, but the odometer is broken.

cheers

mike