Nuge31 Posted April 30, 2022 Share Posted April 30, 2022 Hello, I have a 14 pinnacle, mp8 with an mdrive. It has a shutter in 6,7 and 8th gears while pulling. For the most part I don't notice it running empty. Had mack garage look at it and determined it could be clutch, so I had that changed, no change? Drive line looks good, they want to change injectors next, but I am having a hard time buying that, there are no other indicators that injectors are bad? Anyone else deal with this in their mack? Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/ Share on other sites More sharing options...
Onyx610 Posted April 30, 2022 Share Posted April 30, 2022 Being you have an mdrive/ishift I will bet it’s 100 percent tranny related. How many miles? Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496387 Share on other sites More sharing options...
Onyx610 Posted April 30, 2022 Share Posted April 30, 2022 Love pinnacles by the way! Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496388 Share on other sites More sharing options...
Nuge31 Posted April 30, 2022 Author Share Posted April 30, 2022 408000.. they looked at some things in the tranny when they had it out. On a manual tranny you have splitters, I am wondering if there are high low and mid in that tranny and if there is something up with those middle gears? Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496389 Share on other sites More sharing options...
Nuge31 Posted April 30, 2022 Author Share Posted April 30, 2022 Your probably right, I should of put this on the engine/tranny thread Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496390 Share on other sites More sharing options...
Onyx610 Posted April 30, 2022 Share Posted April 30, 2022 No, this is fine for this thread. I’m just saying it’s more then likely the trans giving you issues. They arnt expected more then 500k if your lucky. Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496394 Share on other sites More sharing options...
Joey Mack Posted April 30, 2022 Share Posted April 30, 2022 did the shop check the u-joints, and air ride height? just curious? has the drive shaft been apart and put back together wrong? I know you have a 12 spd, just curious.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496411 Share on other sites More sharing options...
Nuge31 Posted April 30, 2022 Author Share Posted April 30, 2022 They claimed to go through the drive line,, it feels drive line, but it only happens in 3 gears? Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496414 Share on other sites More sharing options...
Joey Mack Posted April 30, 2022 Share Posted April 30, 2022 I understand, I guess I was thinking that in those gears you are pulling hard to get up to speed.. I hope you get this fixed soon... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496416 Share on other sites More sharing options...
Nuge31 Posted April 30, 2022 Author Share Posted April 30, 2022 Thank you,, it pulls like a champ, just shakes the truck a little Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-496433 Share on other sites More sharing options...
Nuge31 Posted June 12, 2022 Author Share Posted June 12, 2022 Well,, 6k in New injectors and still shaking.. so that's 13k chasing this and still there 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-499992 Share on other sites More sharing options...
Joey Mack Posted June 12, 2022 Share Posted June 12, 2022 have you not checked your tires to see if you have a broken belt in one? what about u-joints? seems to me, someone loaded a parts cannon and pulled the cord.. I hope you find this soon... 13K is too much to spend for a vibration.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-499993 Share on other sites More sharing options...
Hayseed Posted June 12, 2022 Share Posted June 12, 2022 52 minutes ago, Joey Mack said: 13K is too much to spend for a vibration. I Agree, They're bending you over Big time, & giving you Both ends of the Pineapple. In my Opinion.. 1 Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-499997 Share on other sites More sharing options...
Joey Mack Posted June 12, 2022 Share Posted June 12, 2022 I guess I should ask where the shaking is..... In the steering wheel, or in you butt? steering wheel is usually front end issues, in your butt tends to be, behind you in the chassis and suspension and drive line... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500000 Share on other sites More sharing options...
theakerstwo Posted June 12, 2022 Share Posted June 12, 2022 (edited) I had a bad shaking in the front friday and could not decide for sure what it was untill I stop and started to look.It did not feel like the front end but found a lot of mud in my left front steer rim. Edited June 13, 2022 by theakerstwo nk, 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500004 Share on other sites More sharing options...
Vmac3 Posted June 13, 2022 Share Posted June 13, 2022 Does this happen when the truck is pulling a load or getting up to speed? I've had suspension leveling valves cause all kinds of grief. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500124 Share on other sites More sharing options...
Joey Mack Posted June 14, 2022 Share Posted June 14, 2022 (edited) 'V' I asked the same Q earlier, I was thinking driveline issues, u-joints, angle, bearing play, loose yokes, anyway you get it.. I wish one of us was there to help save him 90% of his $13,000.00..... Jojo Edited June 14, 2022 by Joey Mack Poor spelling Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500154 Share on other sites More sharing options...
Popular Post Joey Mack Posted June 14, 2022 Popular Post Share Posted June 14, 2022 (edited) lately, it seem's to me that these shop's and dealerships, are trying to be "Engine" mechanics first, without knowing how to drive, and 'feel' how a truck is supposed to drive. I am so glad I drove tractor trailers for 3 years before I became a mechanic. To me the real issue is "Training" at the shops... The high up guys know how to steal money legally, and the 'Techs' dont know any better.. It hurts my heart when I learn of these stories... however, I am so glad that BMT is here to help those that seek help.. It always amazes me that there are so many guy's here that are willing to help, and looking for nothing more, than to see the repair posted, so it's help's the next guy... BMT... Hell Yeah !!!! Jojo Edited June 14, 2022 by Joey Mack Poor spelling 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500156 Share on other sites More sharing options...
mrsmackpaul Posted June 14, 2022 Share Posted June 14, 2022 Well I have looked at the transmission on google and it appears to be a 4 speed 3 range transmission So I'm thinking one of the range change gears has a crook bearing or gear, and the guess would be the mid range gears But remember I have never driven or even looked at one of these, just using common sense from what I can see and glean from the limited information we have at hand I dont see how injectors or even the clutch could only affect these gears Clutch would be in lower gears and the clutch would be slipping on a normal transmission Paul Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500174 Share on other sites More sharing options...
Nuge31 Posted June 21, 2022 Author Share Posted June 21, 2022 Well, they just changed a drum in the back of the tranny, been off for 7 days of work and that didn't fix the problem.. I have always thought about that mid range thing, but no one there seemed to give it much thought. That drum the just replaced was probably damaged by the shaking and will probably be damaged again as soon as I drive it.. I am disgusted Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500817 Share on other sites More sharing options...
Joey Mack Posted June 21, 2022 Share Posted June 21, 2022 Dammit Man.... Any chance the drive shaft it NOT phased correctly? I went back and read the thread again, and I'm trying to think of any un-asked questions.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500821 Share on other sites More sharing options...
Nuge31 Posted June 21, 2022 Author Share Posted June 21, 2022 Lol.. they have a rental truck? I just found that out? I am going to pick it up now.. I always thought that it was a high low range thing.. when you let me know it's a 3 range tranny,, that makes perfect sence. I don't notice it in 5th, but 6 and 7 I do significantly and 8th some.. no where else Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500838 Share on other sites More sharing options...
mechohaulic Posted June 22, 2022 Share Posted June 22, 2022 confirms the theory , we live in a modern day world of parts changers and dealers cleaning house of the working man. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-500961 Share on other sites More sharing options...
Joey Mack Posted June 23, 2022 Share Posted June 23, 2022 Sad but True, Mech.... I could never go back to a dealership.. Hell,, they dont want my kind anyway, Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-501039 Share on other sites More sharing options...
Popular Post theakerstwo Posted June 23, 2022 Popular Post Share Posted June 23, 2022 The last dealership i worked at before i retired let the parts manger for a year or so come back to a truck in the shop and order parts for a large job like a engine or trans.We got so tired of him telling us what he thinks the engine needs.And on top of that he was almost to young to shave. 1 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69638-shuttering-in-6-7-8th-gear/#findComment-501106 Share on other sites More sharing options...
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