Wulf
Well-known member
Gotcha. Must be fun to drive empty!
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Project Mayhem - A Build Thread
- Thread starter GLTHFJ60
- Start date
Gotcha. Must be fun to drive empty!
GLTHFJ60
Stupid is as stupid does
Thanks. It's not great, I want to say 2750rpm at 70ish MPH. I've got to swap the front end with the 05+ 550 front end I've got at the house so I can put my 22.5 wheels and tires on. That will help a lot on the highway.
I will be dealing with something similar when mine is done. with 245/70R19.5 I will be at 2500 rpm at 70 on a 7.3....Good to know a Dana S110 hub is a direct swap on a Dana S135.
GLTHFJ60
Stupid is as stupid does
I expected my 04 to have a S135, but counting the splines of the axle shaft (to my knowledge the stock 04 axle) showed the same number as the 05 F550 axle I got from the donor truck. That tells me that my 04 has a S110., but with 8 lug hubs?
I'm not sure, but yeah, the bearings are the same from what I can tell, and were identical between the axle in my 04, and the 05 that I bought as a donor, so the hubs are a direct swap.
I did some research and it was a split year some had S135's some had S110 rear ends. Later in 04 they made the switch
GLTHFJ60
Stupid is as stupid does
I did the same prior tearing into my truck. Bearings are the same, so the spindle diameters are the same, only question is if the spacing is the same.
GLTHFJ60
Stupid is as stupid does
155cc injectors and tunes by warren diesel. I've been happy with it for the past few years.
Java230
???
- Joined
- Jul 15, 2020
- Member Number
- 2303
- Messages
- 1,263
Thanks, I am getting SSL cert errors on their site so it wont load. But it looks like they do 6.0 only.
GLTHFJ60
Stupid is as stupid does
Broke down and ordered a 4.30 limited slip axle to regear my truck with. Will bring my highway RPMs from ~2700 down to ~2350 @ 70. Should be a welcome noise reduction while going down the highway, and might even get me some MPGs as a bonus.
https://www.ebay.com/itm/324294927523
https://www.ebay.com/itm/324294927523
Nice, I am curious how you will like the new gearing. The S110 has more ratio options then the 135 I have.
GLTHFJ60
Stupid is as stupid does
The reduction in engine noise at speed will be a welcome improvement if that's all I get. Gravy would be 2-3mpg better on the highway.
GLTHFJ60
Stupid is as stupid does
New diff is here. 4.30, supposed to be LSD, but hard to verify that with the info I have right now. Anyone have a way to look that up based on the pics or info on the carrier?
CarterKraft
Red Skull Member
Stick the axles in the carrier and test?
GLTHFJ60
Stupid is as stupid does
Nah, that wouldn't work. LSDs work on friction based on a RPM differential between the side gears. Can't simulate that by hand. Looking at it, it doesn't have normal spider gears, but helical gears such as in a torsen diff. Looks the same as what came out (more or less) so I'm assuming it's a LSD.
Kinda hard to tell here, but right in the center you can see the end of the aforementioned helical gear:
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GLTHFJ60
Stupid is as stupid does
Doorway opening to the garage is 104" wide, and the bed of the truck is ~102" wide. Tight fit, but if it fits, it ships.
Axle shafts out, driveshaft off, VSS off, drain the oil to reuse (just changed it a year ago) and the old diff comes out.
These fuckin diffs have to be 150#. Jesus fuck.
Old 4.88 in the foreground, new 4.30 in the background. 4.88 diff was something like 39 ring gear teeth, 8 pinion teeth, 4.30 diff is 43 ring gear teeth, 10 pinion teeth. Bonus points if you can tell a big difference at this point (I didn't).
Interestingly enough, the profile of the ring gear, and it's position in the carrier, are way different between 4.88 and 4.30 diffs:
Old 4.88 diff has this crown to the back of the ring gear/abs ring combo that moves the ring gear towards the passenger side of the truck by about a half an inch.
Slapped the bitch in there by balancing it on a floor jack. Diff housing is too low to use a tranny jack, and it's too heavy to bench press (for me) while aligning. Also of note here, I pulled out the 05+ VSS and stuck in my 04 VSS. Fits fine, and test drive proved that it works fine as well.
It was at this point I realized that my old axle shafts were not going to work. Upon careful inspection, it was determined that the axle shafts that came with this 4.30 diff were in fact 36 spline shafts, making it a S130 diff, whereas my old 4.88 diff is 34 splines, making it a S110. Super glad that I had the ebay seller ship this diff with axle shafts, as it wasn't going back together without them.
Also, now that I have a S130 diff in the back of my truck instead of a S110 diff, I technically have more towing/GCWR capacity :P
Counting axle shaft splines. The O.D. of the axle shafts at the spline are different by ~1mm as well (makes sense).
Took her for a short spin last night and man does it feel fast. Can't wait to get it out on the highway and see how it feels. Fingers crossed for 1-2mpg improvement.
Axle shafts out, driveshaft off, VSS off, drain the oil to reuse (just changed it a year ago) and the old diff comes out.
These fuckin diffs have to be 150#. Jesus fuck.
Old 4.88 in the foreground, new 4.30 in the background. 4.88 diff was something like 39 ring gear teeth, 8 pinion teeth, 4.30 diff is 43 ring gear teeth, 10 pinion teeth. Bonus points if you can tell a big difference at this point (I didn't).
Interestingly enough, the profile of the ring gear, and it's position in the carrier, are way different between 4.88 and 4.30 diffs:
Old 4.88 diff has this crown to the back of the ring gear/abs ring combo that moves the ring gear towards the passenger side of the truck by about a half an inch.
Slapped the bitch in there by balancing it on a floor jack. Diff housing is too low to use a tranny jack, and it's too heavy to bench press (for me) while aligning. Also of note here, I pulled out the 05+ VSS and stuck in my 04 VSS. Fits fine, and test drive proved that it works fine as well.
It was at this point I realized that my old axle shafts were not going to work. Upon careful inspection, it was determined that the axle shafts that came with this 4.30 diff were in fact 36 spline shafts, making it a S130 diff, whereas my old 4.88 diff is 34 splines, making it a S110. Super glad that I had the ebay seller ship this diff with axle shafts, as it wasn't going back together without them.
Also, now that I have a S130 diff in the back of my truck instead of a S110 diff, I technically have more towing/GCWR capacity :P
Counting axle shaft splines. The O.D. of the axle shafts at the spline are different by ~1mm as well (makes sense).
Took her for a short spin last night and man does it feel fast. Can't wait to get it out on the highway and see how it feels. Fingers crossed for 1-2mpg improvement.
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GLTHFJ60
Stupid is as stupid does
The 4.30 LSD +shafts cost me $1290 shipped freight, so I could ship this 4.88 +shafts to you for somewhere in the neighborhood of a grand? Would need to get some shipping quotes cause you're on the left coast, but I don't want much for it. PM me if you're serious about it, will probably list it for sale around here.
CarterKraft
Red Skull Member
Nah, that wouldn't work. LSDs work on friction based on a RPM differential between the side gears. Can't simulate that by hand. Looking at it, it doesn't have normal spider gears, but helical gears such as in a torsen diff. Looks the same as what came out (more or less) so I'm assuming it's a LSD.
Kinda hard to tell here, but right in the center you can see the end of the aforementioned helical gear:
Well i really meant I think if it was a open diff it would be easy to tell, from that test not that you could tell if the LSD worked.
GLTHFJ60
Stupid is as stupid does
Again, no. The torsen diff operates as a normal differential until there is enough RPM differential between the side gears to put pressure on the helical gears, to force the opposing side gear to turn.
Meaning, unless you could spin one shaft at a few hundred RPM while holding the other still, there's no way to prove that it's LSD or open. In hindsight, this is clearly a LSD diff just by looking at it.
The bias ratio on a open diff is 2-1. For a Torsen it's more like 6-1. Pretty easy to tell which is which with one tire off the ground.
GLTHFJ60
Stupid is as stupid does
15.2mpg, New best, running ~70 down 95 to Florida unloaded, ~9500 gross. Fucking love the new gears, so much less fatiguing to drive down the highway.
GLTHFJ60
Stupid is as stupid does
Paid $1300 shipped to a local depot for a complete lsd diff with axle shafts, out of a truck with about 120k miles. Found it on ebay, got the price after haggling.
What was nice is that all I had to do was clean it, then throw it in the truck. Took a couple hours tops.
Mattafact
Yellow Skull
And then?
GLTHFJ60
Stupid is as stupid does
No updates other than I put tires on it this year. Goodyear g622s in the rear for some extra traction.
Haven't done it yet, may get it done next year, we will see. I'm contemplating pulling the cab off, engine out, and changing the whole front frame clip instead of just slapping the brackets on. If I had a 2005+ f550 chassis in the right config I'd just swap everything over.