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Old 01-11-2002, 08:44 AM
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1985 300SE Transmission/drivetrain

I need to know the stock tire size, rear axle gear ratio, and the overdrive gear ratio on the 4 speed automatic trans.

I have a customer who has a broken speedo and is wondering what multiple to apply to his tachometer in 4th gear to get an approximate speed.

thanks in advance

Last edited by lordzx; 01-11-2002 at 09:15 AM.
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Old 01-11-2002, 09:00 AM
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Join Date: Sep 2001
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The transmissions have a 1:1 ratio in 4th gear.
I got too many cars!! Insurance eats me alive. Dave

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Old 01-11-2002, 09:44 AM
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thank you for the info.

i got 2 out of 3 so far

205-70-R14 stock tire size
1:1 ratio in the final drive of the 4 speed auto
now i just need the rear differential gear ratio
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