| [GMCnet] transmission mysterie [message #247033] |
Thu, 10 April 2014 16:27  |
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Marc Hogenboom[2]
Messages: 70
Registered: March 2011
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HI All,
The transmission problems I had before leaving for Montgomery have turned into mysteries.
After installing a new vacuum pump all seemed to be well, I did a 50 mile test drive with several steep climbs and everything worked as supposed.
So Away we went. After stopping for propane after about 20 miles the transmission wouldn’t shift, so I put it manually in second and drove to the nearest auto parts store to get a new modulator.
Installed it and drove off. After a while and a couple of grades it flipped out of drive again. Tried adjusting the modulator, no change. Crawled on in second and tried to find a place to camp along a dirt road. Drove slowly for about 15 minutes on that dirt road, couldn’t find a spot and went back on the highway, still in second. Tried shifting up into drive and it held! Drove another couple of miles in D and found a camping spot.
Decided to go on the next day and see what would happen, driving not to fast and trying to keep the trans fluid as cool as possible.
Second day, no problems cruising at 55-60 mph.
Third day, after stop and go traffic in Pecos Tx. It flipped out of D again. Connected the vacuum line directly from the pump to the modulator, no change. In second to Davis State Park where we camped.
Next day, no problems! Only when we had a lot of up and down on steep short grades did it happen once more.
The problem seems to be temperature related, as we had been driving a little faster to keep up with traffic, and trans fluid temp got to be a little higher.
The rest of the trip we had no more problems.
On the last stretch of the way we had a lot off climbing, going from 2000 to 6500 ft. altitude without any problem, so now I don’t know what to think anymore.
Manny asked if there also was a problem with reverse, I said no. Later I found that reverse will give kind of a quiver when backing up against a slope. First I thought is was loss of traction on gravel, but than it happened on blacktop too.
Hoping for your input
Marc Hogenboom
‘73 Painted Desert TDI
Madrid NM
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