Re: 1985 silverado chey

Posted by Ron in NE on November 20, 2002 at 16:38:14 from (65.165.16.22):

In Reply to: 1985 silverado chey posted by joe stewart on November 11, 2002 at 19:49:41:

Since you said it's stuck in "drive", I'm assuming it's an automatic. Most likely it's the 700R4 overdrive, but the following advice is good on any GM automatic. First, crawl under while someone runs the shift lever through the gears(while holding the brake of course so you don't get run over) and make sure the linkage to the drivers side of the transmission is all still hooked up. If so, it's internal. Then you need to go to a parts store and buy a filter kit which includes a pan gasket and filter(you'll be pulling the pan so just as well change the filter while it's off). Take the pan off, with a drain pan underneath to catch the fluid of course(leave two bolts in and remove the rest to allow the pan to drop at an angle and slowly loosen the remaining two bolts to drain the fluid out of one corner before taking the pan off completely). Then, remove the pan and look at the inside of the transmission case where the shift linkage shaft goes in. There is a deal on there called a "rooster comb" with detents that help each gear to be felt. This "rooster comb" is held onto the shifting shaft with a nut. The nut may have come loose. Also, there is or should be an 's' shaped "wire" link from the rooster comb to what's called the manual valve, which is on the driver's side of the valve body(the valve body is the square-shaped cast iron piece that's bolted to the bottom of the aluminum transmission cast with a dozen or more bolts). If the nut on the shift shaft has come loose, this s-shaped link may have fallen off. This would cause the manual valve to not be moved when shifting and the transmission to remain in one gear. If all this looks and moves like it's supposed to, then the problem is deeper and will need to be taken to someone who can check the tranny's internals. If you do find the problem, fix it, clean and reinstal the pan(use just the gasket with no sealer) and refill the transmission fluid and you'll be back in business.
Hope this helps!

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