rascole
Well-Known Member
- Messages
- 2,714
- Location
- Bellflower, CA
Since my SAS I recently started to have power steering pump whine after an hour of wheeling. On the street and highway everything is quite but as soon as there is constant demand on the trail, the howling starts. Clearly the FJ80 box and PSC ram assist are too much and the fluid is getting hot. I installed this current pump in 2019 so it is relatively new and few miles. I’ve been chatting with someone from Radial Dynamics and first thing he said was get the biggest cooler and think about an aftermarket pump. So it got me thinking. Because the H3 PS pumps and reservoirs are getting scarce, I thunk outside the box. With the H3 being a close cousin to the Colorado and Trailblazer, I decided to do a side by side comparison. I bought a Cardone reman for a 2006 H3, Colie and 4.2l TB. The H3 pump is very similar in construction but differs In a few ways.
From left to right. H3-----Colorado-----Trailblazer
- Rear assembly for the Colie & Trailblazer use a snap ring to hold together, H3 is a bolted body for higher PSI I presume.
- Pump cavity on both is notably smaller so GPM is clearly lower, PSI might be the same though. TB is slightly larger than the Colorado.
- All the pump castings share the same 3 bolt mounting but each housing is slightly different. All 3 bolted up to the H3 with no interference.
- Pump vanes are smaller most likely due to lower flow and pressure demand.
- Pump shaft is larger on the Colie and TB so a H3 pulley will not work.
- Reservoir is slightly larger on the Colie and huge for the TB, H3 inadequacies are real.
- All the reservoirs’ mounts are different so they are not interchangeable with each other.
From left to right. H3-----Colorado-----Trailblazer