My 1998 Suburban will not go in to park and will roll as if it is neutral. Also, it won't start unless I put it in neutral and the dash shows that it isn't even in park? Any ideas? I'm thinking it could be to do with the linkage connection on the transmission some how but don't have any other ideas.
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This could be the problem. If your dash indicator is showing reverse but the transmission is in park it could be the safety switch. I'm not talking about the safety switch in the transmission though. In automatics they put a second switch to kill the starter from engaging. You need to adjust the linkage. If your shifter isn't actually on the column but the indicators are there is a cable that attaches the floor shift to the column and that is adjustable. Put the Floor shifter in Park and turn the column section nearest the dash by hand until you find park. Then adjust the cable length as needed. If all you have is the column shift it is still a cable adjustment. Set the emergency brake, drop the shifter to low 1 and adjust the cable linkage by loosening it on the transmission and manually move it all the way to low 1 then tighten it down then move the shifter to park and repeat teh adjustment process to verify that it is properly aligned. Lock the linkage back down and see if the vehicle will start, if it doesn't move the shifter to neutral and try to start the vehicle if the vehicle starts then check the column shift safety switch at the park position to make sure it is still in place and working. Typically, if the vehicle won't start in Park or Neutral it is more likely to be the Transmission neutral safety switch.
Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.
Typically and this is how it works on my 94 chevy suburban.
Put the truck into neutral. apply the emergency brake press the brake pedal and move the 4X4 shifter into 4wd lo Than put the vehicle back in park release the emergency brake and you should good to go from there.
please let me know if you need any further assistance with your vehicle and i would be glad to help you.