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Transmission problem

Tiny
JUSTINBILL
  • MEMBER
  • 2010 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 92,500 MILES
I just put a lift on my truck and as soon as I went to drive it, I noticed it was shifting passed second gear. I assumed that it was a pressure or solenoid problem, so I dropped the trans pan, replaced both solenoids and filter. After all of that I still have the same problem. I check the pan to see if any metal was in there and I did not see any. Prior to this I did not have any issues at all. There is no whining, grinding or any other noises coming from my engine and before I take it to a shop I want to try and troubleshoot it myself.
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Saturday, June 4th, 2016 AT 10:40 PM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
Recheck the work you did with lift you may have tapped into the wrong line and is causing it. Your best bet is to use a fuse and relay from fuse box connection.
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Sunday, June 5th, 2016 AT 8:37 AM
Tiny
JUSTINBILL
  • MEMBER
  • 4 POSTS
I checked my fuses and don't have any issues with them and all of my wiring is still good. When I put on my lift, I didn't come anywhere near my transmission at all. All that I had to do was drop my front diff down and put in drop brackets and remount.

When I replaced the solenoids I did notice that the spot in the B location, the plunger thing didn't retract. Maybe a bad spring?
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Sunday, June 5th, 2016 AT 11:51 AM
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
I meant to say that you wired the lift into the wrong place unless you wired it into the fuse box. That is what I meant. The solenoid may not be working now and not moving the valve body to correct position but I can't really tell try wiring your lift that you installed differently see if that does it
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Sunday, June 5th, 2016 AT 1:45 PM
Tiny
JUSTINBILL
  • MEMBER
  • 4 POSTS
I didn't wire my lift into my fuse box. All I did was u plug connections. There was no after market wires or connectors that needed to be made. Just had all the fuses tested and no issues on that end.
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Sunday, June 5th, 2016 AT 2:06 PM
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
Where did you plug the connection in? If it was at the scanner hook up unplug it those things cause multiple problems with vehicles. If it worked prior to installing the lift then it should work after unless a wrong connection
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Sunday, June 5th, 2016 AT 3:45 PM
Tiny
JUSTINBILL
  • MEMBER
  • 4 POSTS
Scanner hook up? The only stuff that I unplugged and reconnected were: front diff sensor, and front/rear ABS. After it was all done I drive it and hour away and back with no issues. This issue is really getting the best of me and I'm avoiding the mechanic but I think that might be the next step. Do you think it's a sensor or electrical issue?
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Sunday, June 5th, 2016 AT 4:00 PM
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
If it is connected to the abs that may be the problem but it's an electrical issue I think from what you are saying. Have you tried disconnecting the lift you installed and driving it? If it straightened out then that would be your problem. If it does the same with the lift uninstalled then see a trans guy he can scan it to see if something has gone wrong with trans or something else.
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Sunday, June 5th, 2016 AT 4:53 PM
Tiny
JUSTINBILL
  • MEMBER
  • 4 POSTS
I think k that I. Right take it in to a trans shop. Uninstalling the lift would be more of a headache than I can deal with. Thanks for your input, I really appreciate it.
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Sunday, June 5th, 2016 AT 5:23 PM
Tiny
HMAC300
  • MECHANIC
  • 48,600 POSTS
I meant to uninstall the plug ins not the lift.
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Monday, June 6th, 2016 AT 6:44 AM

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