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I have an oddball automatic question. My girlfriend's car's T37 has issues with sticking governor. It gets sticky and upshifts at absurd RPM until it's warmed up. I take the governor out, clean it with mineral spirits, and put it back in about every two months, when the cold-shifting characteristics start getting absurd. I usually do a battery of other tests at the same time, as long as I've got the skid plate off and the car raised up.
But when I cleaned the governor these past two times, the transmission behaved strangely during my test-drive. It seemed to be over-eager to shift through the gears, and then did a bit of a flare-up (brief neutral) when shifting between 2nd and 3rd gears. Each time, I tightened the throttle cable to make the shifts occur a bit higher than where I thought they should, and this made the flare-up disappear.
What do you think is going on? I have been a good boy, I've changed the fluid five or six times, made sure the shift lever is adjusted, and cleaned the filter. Yet it seems that the shift points go lower and lower (and then I get the flareup) with each subsequent governor-sticking and governor-cleaning. I can only adjust the throttle cable so far to compensate each time I clean the governor. At this rate, if I clean the governor ten more times I'll be at the end of it! I've already adjusted it tighter than the "2mm from the crimp when throttle is closed" that the manual recommends. I attached a pressure gauge and the pressure kind-of stays low until I pull the cable out a ways, though.
Do you think the transmission is getting better, and I'm just adjusting throttle cable to where it should be? Or am I losing system pressure more and more as the thing gradually dies? What could even cause that? Sticking regulator valves in the valve body? What affects timing of the second band release vs. rear clutch apply that happens when the transmission shifts from second to third?
Could it be that the flare-up is caused by a sluggish rear clutch engagement? (Reverse does take a while to engage under even the best of conditions) And, by increasing the RPM at which the shifts occur, I'm eliminating a sluggish-shift problem from accumulated gunk by increasing line pressure at which all shifts occur? If so, would slightly too-high shift points wear out the friction materials in the transmission faster than normal?
Are these good ideas at all? Or am I in way over everybody's heads? I stayed up until 2am last night reading the official transmission service manual I have.
posted by 66.109.49...
, Fri, 18 Jan 2013 09:29:16, Sat, 19 Jan 2013 07:23:50
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