Transmission shift adjustment
Thread Starter
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4wd Low
Joined: Jun 2024
Posts: 11
Likes: 1
Transmission shift adjustment
Hi all,
I have a C6 transmission, just had the engine mounts and transmission mount replaced. The truck now won't start in park, will start in neutral only. I have tried adjusting the Neutral Safety Switch (which is new) but no improvement
I have tried adjusting the shift linkage which is out by about 1/2", but when the alignment is correct I cannot put the column shift in park.
Is this a problem with the actual column shift? Is there a way to adjust this?
I figure it is something to do with the transmission gate, but I can't find anything on the interweb that even shows me where that is located
Before you ask, the guys that did the mount replacement are people I won't use again - really don't want to take my truck back to them.
I have a C6 transmission, just had the engine mounts and transmission mount replaced. The truck now won't start in park, will start in neutral only. I have tried adjusting the Neutral Safety Switch (which is new) but no improvement
I have tried adjusting the shift linkage which is out by about 1/2", but when the alignment is correct I cannot put the column shift in park.
Is this a problem with the actual column shift? Is there a way to adjust this?
I figure it is something to do with the transmission gate, but I can't find anything on the interweb that even shows me where that is located
Before you ask, the guys that did the mount replacement are people I won't use again - really don't want to take my truck back to them.
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
What do your cab mounts look like? Is the cab sitting on the frame? That can throw this off.
You might want to adjust it mechanically so you can get the lever to work and get all the gears. And then put it in park, get under the truck and unplug the neutral safety switch. Get a meter and put it on ohms rx1 and then probe the two connections from the switch that go to the two red/blue wires in the truck's harness. Then adjust the switch till the meter reads near zero (continuity). Once you get that, it should start. This may take some of the guessing out of the adjustment.
You might want to adjust it mechanically so you can get the lever to work and get all the gears. And then put it in park, get under the truck and unplug the neutral safety switch. Get a meter and put it on ohms rx1 and then probe the two connections from the switch that go to the two red/blue wires in the truck's harness. Then adjust the switch till the meter reads near zero (continuity). Once you get that, it should start. This may take some of the guessing out of the adjustment.
FTE Legend
Joined: Nov 2015
Posts: 30,919
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From: Angier, NC
Dave ----
Thread Starter
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4wd Low
Joined: Jun 2024
Posts: 11
Likes: 1
Thanks Ken,
I have adjusted both the linkage and the NSS. The linkage slides into place smoothly without any movement to the linkages. The NSS has been adjusted. Both were done following the Haynes Manual instructions.
The shift indicator (on the steering column) shows the truck is in reverse when it is in park. I'm sure there must be a way to adjust the detent bracket, just can't find how to do it!
I have adjusted both the linkage and the NSS. The linkage slides into place smoothly without any movement to the linkages. The NSS has been adjusted. Both were done following the Haynes Manual instructions.
The shift indicator (on the steering column) shows the truck is in reverse when it is in park. I'm sure there must be a way to adjust the detent bracket, just can't find how to do it!
FTE Legend
Joined: Nov 2015
Posts: 30,919
Likes: 4,123
From: Angier, NC
Who looks at the indicator as the pattern has never been changed in 100 years!
If the lever mover the transmission in and out of all the gears then I think the needle can be adjusted as it moves by a string.
When you pull the gauge bezel be careful of the string and once apart you should be able to see what it will take to make it read right.
Dave ----
If the lever mover the transmission in and out of all the gears then I think the needle can be adjusted as it moves by a string.
When you pull the gauge bezel be careful of the string and once apart you should be able to see what it will take to make it read right.
Dave ----
Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
Yes.....after the heavy plastic sleeve & dash bezel are removed, the adjustable anchor of that string can be seen.
Loosen it and slide it up or down, to match the indicator needle to the shifter position.
Loosen it and slide it up or down, to match the indicator needle to the shifter position.
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Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
I just realised you are in Australia...sorry about that! 
I think the Oz trucks used Falcon style columns with the different indicator display, so may not have the string operated needle like the US trucks.
I think the Oz trucks used Falcon style columns with the different indicator display, so may not have the string operated needle like the US trucks.
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