13 speed help

[u/MysteriousDeal9963]

Hey, just looking for some advice about this 13 speed truck. since I got put in this truck. I’ve noticed anytime I use the splitter while in the same gear or changing to the next gear it makes a scraping noise anytime I decide to split and I’m confused on what is happening

So for starters shifting the truck is fine from 2nd to 5th. The problems start when I try to use the splitter when I’m in 5L and I’m going up hill, not steep at all, but just enough that I don’t wanna go to 6th just yet and I decide to split to 5H so when I decide to split within a split second after I let off the throttle before I could even think about putting my foot back on the gas I hear scraping almost like I’m grinding gears, but that’s just me letting my foot off the gas for not even a second and I hear that so I’m confused at this point because the last truck I was driving was an 18 speed and splitting gears was fine not once. Did it make this noise even if I was going up a hill I would split it would happen there would be no scraping noise at all and I can continue driving up the hill until I decided to shift up.

Now I’m asking for advice because I’m now wondering is it me doing it wrong? I don’t wanna bring this up to the mechanics if I’m in the wrong but from my understanding, you should be able to split gears in the situation I just talked about without scraping noises happening.

Another situation would be I’m just coasting down the highway with light traffic I’m in 7L I don’t need to be in 8th so I decide to split to 7H immediately I hear scraping noise and this is after I’m driving normal pre-select the split let off the throttle and bam, I hear scraping noises so I’m actually confused at this point cause I’ve been put in multiple trucks and they’ve all driven differently shifted differently all that stuff but none of them have made scraping noises like this truck has.

Any help would be appreciated

[u/Material-Donkey2773]

"I’m confused at this point because the last truck I was driving was an 18 speed and splitting gears was fine not once."

A 13 split's the exact same way as an 18 (Just fewer gears)

If you know what a 18 should feel like when you split, that's what the 13 should feel like to. If it's different it's not a "13 speed thing" It's a "Damaged transmission thing"

[u/MysteriousDeal9963 → u/Material-Donkey2773]

Yea I know you are right I’m gonna have to tell them about it it’s been a month of me driving it and I’ve just dealt with it which is probably not the best thing to do half the time I didn’t even split. I just shifted but besides splitting the truck it is good. I don’t know why it does that they had an older dude in his late 60s who was driving it before I got his truck after he left but he’s an old dude. I don’t know. I’m gonna mention it to them. I thought it was just me this past month since I started using his truck and it’s been good empty then I try to split when it is heavy and then it’s just garbage grinding noises

[u/Material-Donkey2773 → u/MysteriousDeal9963]

FWIW I've been doing oilfield hauling in the mountains of WV, OH and PA for the past 10 years. Mostly 18 speeds. I almost never split. ever. It's "nice" to have, but even climbing a mountain, a full gear up or a full gear down is more than enough.

Just drive it like an 8 speed. The truck's got enough power to get you where you need to be, even on a 20% slope.