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Dropped out of gear

caleb22

1/2 ton status
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My 76 dropped by itself from park to reverse by itself, not turned on or anything, just sitting in the garage. Would replacing the steering coupler fix that or is it the rack and sector gear or?
 
It might be the detent shifter dewhickey inside the transmission,which can be reached after dropping the pan..it has a ratchet type thing and a leaf type spring with a roller,that keeps pressure on the linkage..

TH350 shift linkage at valve body.jpg
 
I can actually, with the K5 off, set my index finger on the shift lever and it goes through the gears with little effort and without pulling back on the lever.
 
The shifter in my '82 k2500 is very sloppy and loose from years of plowing,going forward to reverse 15 billion times does that to them.
The transmission still has a good "detent" click ,but it does not take much to get it to go from park to reverse now..
 
I know its sacrilegious to suggest this, but.......
Its not a Ford is it?
Fords of that era had a recall for just that problem. My '79 had it, and the sucker shifted into reverse just as I was getting out to hook up the winch, and it chased me backwards across the yard until I could get my feet under me to get back in.
For the life of me, I don't remember what the problem was. Something about the springiness of the shifter linkage that would let the column shifter go to park, and seem to lock in, but the actual shift lever on the side of the transmission did not go all the way into park.
It usually showed up when you slammed the door, but in my case I bumped something as I got out and away it went.

Well, I guess everything is on the internet. I found the original problem. Turns out, Ford never found an actual problem, or said they didn't. They just sent out stickers to advise people to be sure the vehicle was in park and to set the parking brake whenever they got out.
However, the problem does not seem to be confined to Fords. A 1976 Chevy van went into reverse and ran over a guy.

Here is the link to the report.
http://www.fordification.com/tech/auto-trans_recall.htm

I never did anything to my truck, I seem to remember it trying to do it a couple more times. I just developed the habit of putting it in park, and giving it a tug before I got out.
 
I would inspect the linkage and make sure it isn't hitting a header tube or something underhood that would tend to push it. Then check the real range of the linkage to make sure nothing can stop it except the transmission. Ignore the indicator on the column, as it's just a little string and spring deal that is easily mis-calibrated. You should feel it solidly click into each position. If it's still an issue, drop the transmission pan and make sure the little detent spring is strong and the bolt holding it hasn't backed out. I have seen them back out. It seems possible for the teeth to wear over the years, but I've never seen it. Maybe doubling up the spring like shown above is a good solution.
 
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