Alright, First I probbly have a huge speedo error. Found out the 93 190E 2.6 auto had a 2.85:1 rear diff. While doing all my searching, I found that the 300SL in 93 had a 3.69:1 ratio in automatic form. So called up RC-imports, got PGAuto's number, and got the diff in a few days.

Now since they are finally installed, I am shocked. Didn't think that an upgrade less then $500 could make such a remarkable difference. The shifts are a quicker, and more noticeable however, but its a slight cost.

Now as far as calculating the speedo error, I know its noticeable, cause I can't be doing the speed it tells me I am. Doe sit make sense if I say if I am showing 80, its more like 60? Is it a striaght 3.69/2.85 = the % error?

Now I am assuming I just have to adjust the speedo, and thats the easiest way of handling it? DOn't have ASR so not a problem, but haven't noticed it effecting ABS or anything else. Should be clean right?

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Chirag (Charlie) Patel
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- 03 Mercedes S600 Sport TTV12
- 97 Acura NSX-T
- 99 BMW E36 M3 w/500+ HP
- 04 Lexus RX330
- 04 Dodge Dakota Quad 4x4 V8

4 Sale:
- 99 BMW M3 E36 Coup with Dinan SC, Upgraded to an RMS Stage 3 with Aftercooler, 12psi, and 500+hp @ flywheel.

The change in gear ratio will make the car quicker accelerating and shifting. I believe you can get a different speedo gear to correct the error from a MB dealer.

Luke

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