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  #1  
Old 12-14-2006, 04:30 AM
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Join Date: Sep 2000
Location: Ankara, Turkey
Posts: 32
5-speed sport tranny help

Just swapped out my 650000km old original manual gearbox and put a dogleg transmission out of 300SL, direct fit. I also replaced the upper shifter mechanism as the shift pattern is different. However I could not reach any info regarding the gear ratios of the 300SL manual transmission. With a fifth gear ratio of 1:1 and final ratio of 3.07:1, the car accelerates like a dream, on the negative side my highway rpm's are almost 20% higher now. Without sacrificing my lower gear acceleration too much, I think I will also replace the differential with a lower reduction such as 2.82:1 or similar. First I have to check the gear ratios. Any help on this matter is greatly appreciated.

Greetings from Ankara, Turkey.

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2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1976 450SLC
1975 280S (sold)
1973 230.6 (sold)
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  #2  
Old 12-14-2006, 11:53 AM
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The 300SL is the same transmission as a Porsche 928. Some 928 owners effectively use it as a 4 speed, skipping the dogleg first gear because it's hard to get to and very low, but that does not solve the highway cruising problem. Your best bets for an rear axle swap would be: 90 to 92 300E - 2.87, 93 to 95 E320 - 2.65, 92 to 95 400E/E420 - 2.24, early 500SL - 2.65. But then second gear starts are not likely to work very well.
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  #3  
Old 12-15-2006, 07:26 AM
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Thank you for the reply.

I was thinking a final drive ratio between 2.60:1 and 2.80:1, i still need the gear ratios though.
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2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1976 450SLC
1975 280S (sold)
1973 230.6 (sold)
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  #4  
Old 12-15-2006, 09:55 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,306
the 2.65 that is commonly found in the us spec 300ds of that era would put your rpm back very close to what you had before the gearbox swap.

i hope you got a good deal on the tranny!

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 12-15-2006, 10:19 AM
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Quote:
Originally Posted by 06 K 0020 View Post
i still need the gear ratios though.
You may have to find a 300SL owners manual, or buy one from a dealer, or buy one here:

http://www.hemmings.com/classifieds/bookslitforsale/mercedes_benz/

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