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Transmission Questions and a Big Thanks
I'll start with the thanks to all on this board. I've been able to gather much needed information in getting my SD back in order.
After what was originally a suspect valve body, I replaced the transmission with a used unit in working order, with the intention of rebuilding the one that I pulled from the car. Understanding that the transmission I've recently put in, isn't brand new it functions well despite these two questions. I like to think that my search skills are adept, but perhaps I'm missing the information that I need. Here are some questions: 1) Once the car is warm I'm getting what i believe to be "flare" between 1 and 2. 2) I also believe that I'm not getting into 4th gear and that I'm cruising in 3rd. What should RPM be at certain speeds in an 83 300sd? What is the RPM at 60 mph in 4th gear? Gracias! |
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I should have added that this is an 83 300SD.
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Put that in your signature so it’s always there and add your location then you never have to worry about it again.
I have and 83 also so if I get a chance I'll check the RPM at speed this afternoon. As I remember when I first got mine I thought it was only going up to third gear but after really listening to the shifts I could tell it was going into 4th.
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1983 300SD 200000miles |
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My tach hasn't worked in a while bit I remember cruising around 60 was about 3000rpms. It is much higher then you'd think but if it wasn't shifting into 4th it would probably be about 4500. Sounds like weak springs in the valve body but you have replaced those? I am also assuming you have properly adjusted he bowden cable for proper shift points
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
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Under gradual, smooth acceleration, shifts should occur at around 12, 20 and 25 mph. You could verify the top gear by downshifting when you think you are in 4th. |
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Regarding the tach, my brother helped me out with a simple fix. In my case the tach was okay, so there is a common problem with the tach. There is a round cap on the driver's side fender well that unscrews. This apparently is related to the tach, but I'm not sure of the proper name of the part. Unscrew the cap. Separate the inside from the cap. The reason my tach was working intermittently was due to this unit not having proper contact with the socket. Put a shim of some type in there. It forces the contacts of the plug into the socket further. |
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http://www.peachparts.com/shopforum/showthread.php?p=2327213&highlight=tach+amp#post2327213 Last edited by tangofox007; 12-06-2009 at 11:18 AM. |
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You've got two problems. The linkage for the Bowden cable has possibly gone "overcenter" and doesn't move when the throttle is opened. If this is the situation, all the shifts will be early...........doesn't matter what the throttle position is..........you won't get any revs out of it. But, more significantly, it won't engage first gear..........you only get 2-3-4. Count the shifts.........see if you only have two of them on the way up. The second problem is the 2-3 flare............major success is usually the outcome with a new K1 spring kit is installed. |
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Don't over look the shift linkage bushing.
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92 300D 2.5L OM602 OBK #59 |
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Aside from trial and error are there any more scientific ways to adjust the bowden cable? I must admit that I didn't bother much with Bowden Cable adjustment so the theory of starting in 2nd is something I'll look into. Someone mentioned the shifter bushing. Any links to posts on this? |
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Here ya go for the shifter bushings:
http://www.peachparts.com/shopforum/showthread.php?t=112582 http://www.peachparts.com/shopforum/showthread.php?p=646647 Bowden Cable: http://www.peachparts.com/shopforum/showthread.php?t=41603 http://www.peachparts.com/shopforum/showthread.php?t=54776 All taken from the Transmission DIY links section: http://www.peachparts.com/shopforum/showthread.php?t=142395 Hope this helps!
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
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Thanks for the help. |
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The bowden cable is definitely doing something. I've pulled it out turn by turn which has increased the shift points, but still I'm only counting two shifts which leaves more questions.
1) Have I just not dialed in properly? 2) Is it possible that I'm missing one of the shifts? 3) Anything else to check for? 4) Keep turning bowden adjustment for other results? Thanks.
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This area is typically used to brag about one's current or former automobiles. |
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