2007 Tahoe, 4x4 5.3, 217k miles, I bought it for track duty.
Bought 'as is' with the intel that the oil pressure was intermittently 'not great'. I purchased it and drove it 50 miles, it wasn't great but not horrible (~30psi).
Installed the tracks, changed oil, swapped the screen and the sensor. At startup it'd be in the 30psi range then float around 25psi when working it. Working it meaning pulling 7500lb fish houses on skis, 4low, fair amount of rpm, but no stress beyond say 3500 rpm and heat. But would drop to say 20psi or a bit lower at hot idle.
This weekend it was stupid cold outside (-30F ambient) so I pulled it apart.
The pickup O-ring wasn't broken but it was square vs round and hard. The oil pump had some scoring but didn't look bad at all, the check ball/spring looked fine.
Dropped in the new bits (O-ring / Melling 295HV pump / gaskets / bolt) and now at cold it's 49psi cold and 42psi at hot idle. Off of idle the pressure goes up in relation to rpm, topping at say 70psi.
I did the swap without dropping the oil pan, took 2.5 hours, super easy to-do, even getting the pickup tube bolt out, maybe 3 min to remove, say 5 min to reinstall.
Some tips
- Get the LS specific pulley off Amazon, the one with the 3 right angle fingers (GM 25264 I believe is the number)
- Get the pulley installer (long bolt with the thrust washers), super easy to get seated
- Get the Tekton 8mm/10mm 45-degree angled box end wrench; you can break the pickup tube bolt loose and tighten it without pan removal
Here is what it looks like on the tracks
Bought 'as is' with the intel that the oil pressure was intermittently 'not great'. I purchased it and drove it 50 miles, it wasn't great but not horrible (~30psi).
Installed the tracks, changed oil, swapped the screen and the sensor. At startup it'd be in the 30psi range then float around 25psi when working it. Working it meaning pulling 7500lb fish houses on skis, 4low, fair amount of rpm, but no stress beyond say 3500 rpm and heat. But would drop to say 20psi or a bit lower at hot idle.
This weekend it was stupid cold outside (-30F ambient) so I pulled it apart.
The pickup O-ring wasn't broken but it was square vs round and hard. The oil pump had some scoring but didn't look bad at all, the check ball/spring looked fine.
Dropped in the new bits (O-ring / Melling 295HV pump / gaskets / bolt) and now at cold it's 49psi cold and 42psi at hot idle. Off of idle the pressure goes up in relation to rpm, topping at say 70psi.
I did the swap without dropping the oil pan, took 2.5 hours, super easy to-do, even getting the pickup tube bolt out, maybe 3 min to remove, say 5 min to reinstall.
Some tips
- Get the LS specific pulley off Amazon, the one with the 3 right angle fingers (GM 25264 I believe is the number)
- Get the pulley installer (long bolt with the thrust washers), super easy to get seated
- Get the Tekton 8mm/10mm 45-degree angled box end wrench; you can break the pickup tube bolt loose and tighten it without pan removal
Here is what it looks like on the tracks
