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450 SLC
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1 Posts
Discussion Starter #1
Is there a 4 speed transmission that I can replace my 3 speed with? The car revs high at highway speeds. Is this recommended?

Any answers would be appreciated.

Cheers,
 

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350SLC, 500SLC, 300TE, 190E2.3 Sportline
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690 Posts
3 speed vs 4 speed

A 4 speed auto transmission will not help since top gear is still a direct drive (1:1) ratio. Only a change to the rear axle ratio or an overdrive type transmission would change things. These engines were designed to be able to run at high continuous speeds without damage and their torque and power characteristics were optimised for these speeds. You will also be pleased to know that the old 3 speed transmission fitted to the 350 and 450 has a reputation of longer life than some of the more recent 4 and 5 speed transmissions.
 
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