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Old 05-29-2012, 11:48 AM   #1 (permalink)
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Gear Selector Switch problems

I have been having problems after my shift kit install with the switch not showing park sometimes and if the selector is between Drive and Neutral sometimes i will be going down the road and it says its in reverse i understand where this switch is on the tranny but I don't know the part number. Btw my shift cable linkage is tighter than it was before.
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Old 05-29-2012, 12:23 PM   #2 (permalink)
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There is a little plastic cam that is on the valvebody by the rooster comb on 48RE's that habitually wears out. when that cam wears out the switch, no matter how new it is will end up being all over the place for the gear selection.

there is an adjustment on the cable somewhere but I've never done it. If you're in drive and the selector is showing R then it is WAY outta whack.
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Old 05-29-2012, 12:29 PM   #3 (permalink)
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there is only some rare cases i have seen reverse. So you are saying i would have to replace that plastic cam?
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Old 05-29-2012, 12:42 PM   #4 (permalink)
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I don't know of anybody OEM or aftermarket that makes a new piece for that cam... usually a new valvebody is needed to get a new piece on there.

before you jump to this check the condition of the cam. You'll be able to see it when you drop the pan. You'll be able to see where the position sensor comes into the trans, it has a big plunger that shoots out and interfaces with the cam. look for a groove run radially around the cam when you pull the pan.
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Old 07-06-2012, 09:23 AM   #5 (permalink)
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where you able to figure this out? i am having the same problem... driving me crazy, tired of my reverse lights coming on while cruising down the highway!
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Old 08-12-2012, 11:16 PM   #6 (permalink)
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I found this thread while doing a search for my problem. My gear selector keeps jumping around. It will go from drive to reverse then park, etc. Its all over the place but it doesnt seem to be causing any problems. Any ideas or someone else with this problem.
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