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swathdiver

swathdiver

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Took the truck out for a little spin and some 0-40 runs on a not so deserted road. Whereas the engine rpm would hesitate a little where the converter stalled to, now she doesn't at all and just keeps winding up the rpms faster until it's time to shift.

Might go to the race track tomorrow night if the rains stay away.
 

Big Mama

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Looks great. James, overall how difficult would you say this job was? Notwithstanding the health concerns you’ve been fighting. Could a person that does their own maintenance stuff do it? How about special tools? Just wondering.
 
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swathdiver

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Looks great. James, overall how difficult would you say this job was? Notwithstanding the health concerns you’ve been fighting. Could a person that does their own maintenance stuff do it? How about special tools? Just wondering.
The most technical part of this is setting the pinion depth if you are changing gears. There are kits sold to do this, I chose to piece together the kit GM techs use which eliminates pressing on old bearings to take measurements. Of course, it was only tough doing it the first time. If we do it again before our institutional memory expires, it would go much quicker!

The most difficult part was getting the rotational torque to spec. Since the axle was out of the car and laying on top of saw horses, we had to have guys hold it down while we tightened the pinion nut to crush the washer to get the desired rotational torque. We used a long breaker bar with the handle from a floor jack and we would turn it a little and then use the special torque wrench (works like a beam style) to measure the rotational torque in inch/pounds.

I went over the first time and ran out of spare nuts, crush washers and seals and ordered some more and we tried again the following week. This time I went much slower, stopping and measuring after every little turn of the nut so as not to tighten it too much. It was tedious work that required patience but not particularly technical or hard.

Some of the specialized tools made the job a whole lot faster. 2-Jaw puller was needed to replace the bearings on the carrier. I used special tools to pull the wheel bearings and tone rings out and special drivers to install new ones. Some generic tools can be used to pull them out. The inside of the axle tube is stepped so that the installation of the tone ring will stop as you press/hammer it in and then can install the wheel bearing the same way without fear of them going in too far.

Guys who do this all the time like LT Tolman, he just uses a hammer and screwdriver for almost everything! LOL

Two or three special tools are required to take apart the carrier. I had no plans to do this so they were not purchased. Yet!

There are also specific tools to make overhauling and re-gearing the front axle easier. I bought some of them but decided that purchasing a used differential would suit me better for now. The "new" front differential has 79K fewer miles than my truck.

Now our three trucks all share the same rear differential and carrier and have the tools to keep them running for a decade or two or more.

So, can you do it? Absolutely!

I can put together a list of tools used sometime if you like.
 
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swathdiver

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It's over a thousand miles now and the computers have adjusted to the new gears. That and we're used to them now. Doesn't feel any different than before other than not unlocking the converter or downshifting to go over hills where it used to. That is to say during normal driving. If you get on it, there's a definite improvement in acceleration.

Very well pleased and many thanks to my helper Frank! Trying to get to the track before Christmas.
 

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It's over a thousand miles now and the computers have adjusted to the new gears. That and we're used to them now. Doesn't feel any different than before other than not unlocking the converter or downshifting to go over hills where it used to. That is to say during normal driving. If you get on it, there's a definite improvement in acceleration.

Very well pleased and many thanks to my helper Frank! Trying to get to the track before Christmas.
" ...at the track"..... PICTURES !! ( video?)
 

Marky Dissod

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It's over a thousand miles now and the computers have adjusted to the new gears.
That and we're used to them now.
Doesn't feel any different than before other than not unlocking the converter or downshifting to go over hills where it used to. That is to say during normal driving.
If you get on it, there's a definite improvement in acceleration.
Have you noticed any difference in MpGs? Better / worse / same?
 
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swathdiver

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" ...at the track"..... PICTURES !! ( video?)
Supposed to go in the morning but my wife filled the tank with Rec 90 this afternoon. Argghh! Not sure what I'm going to do now.


Have you noticed any difference in MpGs? Better / worse / same?

Around town, same and better. But I have not actually quantified it with tests. The last tank of fuel was almost all city driving and averaged 14.0 mpgs and 1.7 gph. My wife drove a lot of that. She usually gets 2-3 mpgs worse than when I or my daughters drive the truck.

Of all the tanks that averaged in the 23 mph range, this one is 2nd highest. The others are 1/2 to 1 mpg less. One was 1/2 an mpg more.
 

Marky Dissod

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Have you noticed any difference in MpGs? Better / worse / same?
Around town, same and better. But I have not actually quantified it with tests.
The last tank of fuel was almost all city driving and averaged 14.0MpG and 1.7GpH.
My wife drove a lot of that. She usually gets 2-3MpGs worse than when I or my daughters drive the truck.

Of all the tanks that averaged in the 23MpG range, this one is 2nd highest. The others are 1/2 to 1MpG less. One was 1/2 an MpG more.
More axle gear typically improves city / metro / urban MpG.
That's why 6L80's 1st gear is more assertive than 4L60's 1st gear, 8L90's 1st gear is more assertive than 6L80's 1st gear, and so on.
(10L80's 2nd gear is pretty much 4L60's 1st gear, actually.)
 
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swathdiver

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More axle gear typically improves city / metro / urban MpG.
That's why 6L80's 1st gear is more assertive than 4L60's 1st gear, 8L90's 1st gear is more assertive than 6L80's 1st gear, and so on.
(10L80's 2nd gear is pretty much 4L60's 1st gear, actually.)
Generally I'd agree with you. However, back in 2018 I looked at the fuel economy of our actual trucks (Fuelly.com and window stickers) and saw that there was virtually no difference between the 2007-2008s with their 4-speeds and the 2009 with the 6-speed. When VVT was added in 2010, the picked up a solid mpg over the previous years.

The 2009 XFEs were advertised as 1 mpg better with their non-VVT motors and 6-speeds over the previous years. To do that, they used lighter weight wheels and tires, lowered them in the back and used aluminum suspension components.
 

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