Had the same issue on my 2001 8.1 The current version of the power steering pump has a new lowspeed bypass valve design that gives you more boost at slow or no speed. Make sure you get the latest factory gm pump. Backing my boat up the driveway was a real chore, now its much better.
Did you use OEM spark plugs? Is the 02 sensor the original one? If you used OEM parts and the 02 sensor is new, re-check the previous work the make sure that is not the problem. My 8.1 was doing something similar and new OEM plugs and a new 02 sensor fixed it.
Again, i do not believe that is true. The 6.0 did not get significantly better mileage than the 8.1, nor did it have more torque.
I dont believe this was the case. The big block got the same mileage with a 4l80e, 4 speed behind it, which is what the 8.1 suburbans came equiped with. My 01 2500HD has the 8.1/allison combo and now has 180k-ish miles on it and gets 10-12. I believe the motor was rated 345 horsepower. The new 6.6 small block is 410 horse, i cant see it having any problem with the 10/1000 allison
I believe the differences are much smaller than you believe, the bolt pattern on the back of the engines is the same, the bellhousing internal dimensions are the same. The allison converter probably holds more fluid than the 6L90 and perhaps the lockup clutches weigh more, but the weight difference would be trivial.
I am not sure what you mean by "2-3 times the size of a 6L90 converter" are you referring to the torque converter fluid capacity, or its dimensions?. The older allison 1000 and the new 10L1000 have the same "size" converter, both diameter and fluid capacity. I can easily see them offering it with the gas motor.
The allison 1000 was used behind the 8.1l big block gas motor and the diesel. The new 6.6 is similar in power to the older big block, i believe the 10/1000 is more than appropriate for the 6.6's power.
The 10 speed in the 1/2 ton is a completely different and light duty transmission compared to the heavy duty 10 speed in the diesel 3/4 and 1 ton trucks.
If they ever offer the same 10 speed as in the diesels with the 6.6 gas, properly calibrated to the engines power curve, I think it will be a very good alternative to diesel.
Dad had the same issue, dealer replaced the pads twice, the squeal always came back at low speeds. Finally got frustrated, and even though still under warranty installed the wagner posi quiet (might have been centric thermo quiet pads) Problem solved, I know it sucks, but the noise was driving dad crazy.
vucelick replied to Carolina's topic in 6.6L Gas V8 & HD Transmission Powertrain (L8T/MYD)You do not want to use the cruise for the first 500 or so miles. The engine rings are still in the break-in period. The dealer should have mentioned this to you.
My brother was recently in the same boat as you are. All he could find were high-mileage, over priced trucks in his price range, he was trying to justify one of them because of his needs. I told him to look into a new gas truck in the 3/4 or 1-ton range. He bought a 2021 2500HD with the new 6.6 gas motor and could not be happier. The gas trucks do not have the markup or wait associated with the diesel trucks, and its capabilities are substantial, and its warrantied. If that is not something you are interested, and If you can wait it out, this used vehicle bubble will burst and you will be in a good position to buy used when the prices collapse.
It is still a 15 year old piece of equipment. Of course i still have my 2001 2500HD, but i got it from the original owner in 06, so i know its history completely, someone else's vehicle/equipment is another story all together.
Looks like you pulled some of the welded-in nuts out of the frame. I think your method is just fine, take it all off, straighten it all out however you can, press, hammer, vise, big adjustable wrench. Just be careful if you have to weld on the frame to re-attach the nuts.
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