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lol ..... Are they the "weld-them-up" group? ... A Cheap and dirty version of Mike's solution. It's not a terrible business model considering the intelligence level of some folks like the guy who installed the ECO hubs backwards, then did a video explaining to everyone the greatness of his...
I observed this change with mine. Leaving my house starts with a 5 mile 5-7% varying, continuous downhill grade. Speed limit 45. With 3.07 without ECO, I hit the pacbrake at 50mph and it downshifted to 5 and slowed the truck to sub 40 pretty easily. I have to turn off the pacbrake otherwise...
I'll certainly update once installed. I get stuck in 12" of snow routinely trying to get into the barn. It's not a compliant. Open diffs don't do snow. Should be fine with the lockers.
I have this chart saved from earlier reads. 73 at 1600 on the 2nd chart is nicer than the last chart. At 75, mine is shifting a lot between 6 and 5 with 3.07 if there's a little hill. I have them so I guess I'll install them (3.90).
So back on topic, since it was me that got us off topic: I was wondering what the forum feedback is on me staying with the 3.07 gears AND Eco hubs instead of swapping back to 3.90? I'm still putting in 2 of the Detroit lockers (meritor version) so I'll be pulling the diffs regardless, but...
I went thru it, and all the posts from #590 ... to #625, EXCEPT 613 are all part of the Allison Stall test discussion.
New thread I started is called "LMTV Allison Stall Test issues"
It was holding at 1100rpm. I came off the brake and let it sit for a second at 1100. Had to get to 1200 to start creeping. But it did start accelerating at 1200 albeit slowly. So maybe 1150 is the threshold
It barely starts moving at 1200rpm from a dead stop on the slope. I was barely on the throttle. It kept moving steadily, barely, until I got to the top and then started accel.
With the tach in there, it's easy to see your point in the last paragraph. I was driving up the hill back to the...
I'm rigging up my tach off the alt R terminal just to test it. I can use the spare/unused 568A energize wire from K11 since it's already up in the PDP. The delco instructions say 10pulses per rpm, then I got the pulley ratio too. I think that's 2.5:1
Here's the measurement. It's only a 40' section of driveway but rises at 9.75 degrees. I was surprised it was that much. No wonder I spin around when plowing snow. The backhoe does a 180 on that spot without my chains. So that comes to 17% grade.
It's a pain bc I have to stop dead on that rise...
Hey I still have that setup. Only observation is that I never see gear 7 and only feel 6 kick in on flats at 75mph. The take-off effort is a little strained on uphill starts (my drive entrance to the main road is 10% grade for 50'). So when I go back to 3.90s soon, I expect I'll simply be...
Looks ideal. I have to swap in 3.90s that I've bought from Memphis, AND service the hub seals & bearings on the front so I'll be back inside my eco hubs in a month or so. I have to get a set of these from you since I'll have them dissembled.
Yeah, it was obvious to me on the first 500yd drive slow up hill in snow that the previous low gearing was of no value in that situation. I always wondered why this truck was so slippery in loose or wet conditions. The 3.07s + ECO still seemed "low" in 1 but more controllable as the low end CAT...
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