Brand new GMC Sierria with less than 1600 miles, when driven seems to fall out of gear at 20 mph. Gear indicator (the little _ that indicates P, R, D ect) is not displayed. Small tic heard when allpying break.
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An automatic transmission with 300,000 miles on it should be in some kind of record book it's unheard of !!! It seems counterintuitive but changing the fluid on a tranny with this many miles can be the death knell. I have seen it many times but if you got that many miles out of it was on deaths door anyway. If you are really attached to it don't even think about a junk yard tranny, they will be just a little less worn out that the original in you car now. FYI it's going to be at least 2G's to have it rebuilt.
Do you have after market tires that are larger than stock ? This will affect your speedometer.Another thing could be the speedometer gear which is easy and cheap. Its at the end of your speedometer cable inside of transfer case.
1997 GMC Subburban 1500 loses Tach Speedo and Trans sticks in High Gear. I changed the ignition Starter switch which I read was the problem but problem is intermittant and still exist? AMMCO told me to try changing the Neutral Saftey switch first, but didn't say why?
I have the same thing but mine is between 45-50 mph. I read about this a while back in a magazine for people that pull campers, the problem exists in all vehicles although its not as noticeable in every thing you ride in. There is a certain "point" at which your speed and engine speed reach, that causes a phenomonon that causes a vibration. Engineers relate it to "harmonics" which is a similar issue but in the electronic field of study. There is nothing you can do for it, and it varies from unnoticeable in some vehicles to driving you insane in my 1989 Mazda B2200. I had an '89 Ford F-150 that did it at 35 mph and a 2001 Dodge Diesel that did it at 45 mph, but those were the only three vehicles I've ever driven and noticed it.