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#31
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#32
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Is is possible that this downshift is not noticeable with very slight pedal?
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#33
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My '82 300D shifts precisely as the manual describes. With no throttle pressure, it moves off in 2nd. Step on the pedal, it downshifts. Absolutely no doubt about it.
Furthermore, my transmission only downshifts to 1st when slowing to a stop if the selector is in L; that downshift is incredibly noticeable. The 2-1 downshift is very subtle and could easily be missed by the average operator. Furthermore, a maladjusted Bowden cable could easily prevent proper operation. (A cable that is too tight would communicate throttle pressure that does not actually exist.) |
#34
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If it was a bit warmer, I'd experiment with it............ |
#35
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The ATSG manual very clearly indicates that only some V-8's get the second-gear start. All diesels (of 722.3 vintage) rest in second, then immediately shift to first upon application of the skinny pedal. This shift is not easily felt. Both my 123.133 and 126.125 operate in this prescribed fashion.
As mentioned, the 3-4 shift is pretty slight under "normal" driving. To test it, use "your normal" skinny pedal to run the car up to about 40 MPH with the shifter in "D." While maintaining 40, shift to "3." RPMs and noise will slightly increase, and you'll hear/feel the shift. Shift back to "D." RPMs will drop a little, and you'll hear/feel the shift. Another way to test is "backwards" shifting. Drive the car at 40 in "D" and shift to "3." Do you get a downshift? Then you were in fourth. Drive the car at 25 in "3" and shift to "2." Did you get a downshift? Then you were in third. Continue at 25 in "2" and note RPM (or engine sound if tach kaput or not fitted). Leave lever in "2" and come to a stop. Speed back up to 25 while noting engine performance. If it won't go back to 25 without sounding like the engine might come free from its moorings, you are locked in first. When you then shift to "3" you may feel two very quick shifts (1-2 then 2-3). The shift behavior of a four-speed with only three selections is a bit perplexing. "D" gives four gears of operation. "3" gives three gears of operation. "2" DOES NOT GIVE TWO GEARS OF OPERATION. Rather it will hold it in first upon acceleration, or upon decel will shift to second if you're going less than about 20, or will shift to first if you are going less than about 30 (look for the two dots on the outer edge of the speedo rim) and floor it. The dots are for full-pedal upshifts or safe operating speed. One dot for 1-2 shift. Two dots for 2-3 shift. Three dots for 3-4 shift.
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James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k |
#36
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#37
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My most recent findings are that only under heavy full-throttle acceleration I can get into 1. Normal pedal pressure has it starting in 2 and upshifting as normal. Now that I'm confident that the transmission is operating close to normal I have a question on clunking. It clunks upon shifting into gears up or down. I'm under the assumption this is a mount or bushing issue. I reused the original transmission mount, which looked to be fairly clean and firm, but I didn't pay much attention to it.
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This area is typically used to brag about one's current or former automobiles. |
#38
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You'll need a vacuum gauge and you'll need to T it into the modulator line (the line to the transmission) and put the gauge in the cabin so that you can watch the gauge while you drive it. My suspicion is that your gauge will read zero or very close to zero under all conditions. |
#39
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I will check vacuum at the modulator again to be safe. Thanks for the thoughts here.
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This area is typically used to brag about one's current or former automobiles. |
#40
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All Dialed In
Thanks to all for help and suggestions.
After continuous tweaking and nearly giving up I have the bowden and vacuum adjustments where they need to be. It is hitting shift points up and down as it should under normal and full acceleration. It does shift to 1 on a hard accelleration, otherwise starts in 2. 2-3-4 normal acceleration 2-1-2-3-4 hard acceleration Will do K-1 spring next.
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This area is typically used to brag about one's current or former automobiles. |
#41
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#42
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I don't know if it is possible, but your transmission acts exactly like the one in my 500SEL. It starts in 2 nd unless you push hard on the go peddle. Is it possible the transmission you put in came from a V8 gas car?
Paul
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84 500 SEL (307,xxx miles) |
#43
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I'll give you that, and I'll check further. I had a chance to drive a family member's 300SD of the same vintage and I concur that the 2-1 downshift at start was somewhat seamless.
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This area is typically used to brag about one's current or former automobiles. |
#44
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I'm still finding that only a good hard push of the pedal to the floor gives me a downshift to 1 from a standstill. It seems as though my other shift points are on point. Under full acceleration It shifts in unison with the dots on the speedo.
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This area is typically used to brag about one's current or former automobiles. |
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