2022 3500 diesel, transmission query

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Grenadiers

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<div class="bbWrapper">Driving with the 3700# truck camper on, towing a small trailer, truck downshifts on a flat section of road. Using cruise and tow/haul mode, 70-75mph. Weird. Take it off cruise, and tow haul, slow down, I think I put it in neutral too. Happened twice. See pics for weirdness.<a href="https://hdrams.com/forum/attachments/img_8571-jpeg.64936/" target="_blank"><img src="https://hdrams.com/forum/data/attachments/64/64936-0822d56a6463b47838e91812fd41621d.jpg?hash=CCLVamRjtH" class="bbImage " style="" alt="IMG_8571.jpeg" title="IMG_8571.jpeg" width="200" height="150" loading="lazy" /></a><a href="https://hdrams.com/forum/attachments/img_8570-jpeg.64937/" target="_blank"><img src="https://hdrams.com/forum/data/attachments/64/64937-e62b1c395af10b2d66010e694049e097.jpg?hash=5iscOVrxCy" class="bbImage " style="" alt="IMG_8570.jpeg" title="IMG_8570.jpeg" width="200" height="150" loading="lazy" /></a><a href="https://hdrams.com/forum/attachments/img_8569-jpeg.64938/" target="_blank"><img src="https://hdrams.com/forum/data/attachments/64/64938-0e7756e9f20a7b7ede370623e8d0a8e2.jpg?hash=DndW6fIKe3" class="bbImage " style="" alt="IMG_8569.jpeg" title="IMG_8569.jpeg" width="200" height="150" loading="lazy" /></a></div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 35539" data-quote="Grenadiers" data-source="post: 285783" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/forum/goto/post?id=285783" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-285783">Grenadiers said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Driving with the 3700# truck camper on, towing a small trailer, truck downshifts on a flat section of road. Using cruise and tow/haul mode, 70-75mph. Weird. Take it off cruise, and tow haul, slow down, I think I put it in neutral too. Happened twice. See pics for weirdness.<a href="https://hdrams.com/forum/attachments/64936/" target="_blank">View attachment 64936</a><a href="https://hdrams.com/forum/attachments/64937/" target="_blank">View attachment 64937</a><a href="https://hdrams.com/forum/attachments/64938/" target="_blank">View attachment 64938</a> </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Ok, I’ll bite.<br /> Type transmission?<br /> In the first picture you’re at 44mph in 4th gear, 6th gear is locked out and cruise is engaged. No engine brake mode is selected, tow haul is selected. Battery voltage is ok and indicated(fake) oil pressure is good. .8 mile later you’re in 5th gear at 53mph and 1500 rpm, cruise is still engaged. The last picture is .9 mile later, you’re in 3rd gear at 32mph and 1500 rpm, and the cruise is off, tow/haul is still on.<br /> What am I missing?<br /> You went from 70mph in 5th to around 40mph in 4th and back to 53mph in 5th before canceling cruise and using the throttle?</div>
 
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<div class="bbWrapper"><blockquote data-attributes="member: 35539" data-quote="Grenadiers" data-source="post: 285783" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/forum/goto/post?id=285783" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-285783">Grenadiers said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Driving with the 3700# truck camper on, towing a small trailer, truck downshifts on a flat section of road. Using cruise and tow/haul mode, 70-75mph. Weird. Take it off cruise, and tow haul, slow down, I think I put it in neutral too. Happened twice. See pics for weirdness.<a href="https://hdrams.com/forum/attachments/64936/" target="_blank">View attachment 64936</a><a href="https://hdrams.com/forum/attachments/64937/" target="_blank">View attachment 64937</a><a href="https://hdrams.com/forum/attachments/64938/" target="_blank">View attachment 64938</a> </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Was there a headwind or a wind gust? At 75 mph with a camper, I’m not surprised by the downshift even on a flat road if you had any kind of a headwind.</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 35539" data-quote="Grenadiers" data-source="post: 285783" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/forum/goto/post?id=285783" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-285783">Grenadiers said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Driving with the 3700# truck camper on, towing a small trailer, truck downshifts on a flat section of road. Using cruise and tow/haul mode, 70-75mph. Weird. Take it off cruise, and tow haul, slow down, I think I put it in neutral too. Happened twice. See pics for weirdness.<a href="https://hdrams.com/forum/attachments/64936/" target="_blank">View attachment 64936</a><a href="https://hdrams.com/forum/attachments/64937/" target="_blank">View attachment 64937</a><a href="https://hdrams.com/forum/attachments/64938/" target="_blank">View attachment 64938</a> </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> Nothing weird about those pics. TH locks out 6th below 65, 5th below 55, and 4th below 45 on my truck. So what I see is normal.<br /> <br /> You haven’t mentioned which transmission you have thou.<br /> <br /> Do yourself a favor and get some better gauges up there, oil pressure is fake and voltage doesn’t tell you anything worthwhile while towing. <br /> <br /> Boost, trans temp, coolant temp, and instant mpg all are indicators has to how hard the engine is working and you don’t have any of them displayed.</div>
 
<div class="bbWrapper">Looks to me that this is all done in manual mode due to the manual gear selection &amp; speeds.... ???? my manual selections stay in the gears selected until it peaks at highest rpm&#039;s and stays there... until manually shifted... up or down...</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 5963" data-quote="ironmike" data-source="post: 285820" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/forum/goto/post?id=285820" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-285820">ironmike said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Looks to me that this is all done in manual mode due to the manual gear selection &amp; speeds.... ???? my manual selections stay in the gears selected until it peaks at highest rpm&#039;s and stays there... until manually shifted... up or down... </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> Only one of the photos indicated that the gear is being held by the ERS, the others are working based on standard TH programming. Even then the one that shows 5/5 wouldn’t be in 6th either way due to TH being active.</div>
 
<div class="bbWrapper"><blockquote data-attributes="member: 16713" data-quote="AH64ID" data-source="post: 285821" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/forum/goto/post?id=285821" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-285821">AH64ID said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Only one of the photos indicated that the gear is being held by the ERS, the others are working based on standard TH programming. Even then the one that shows 5/5 wouldn’t be in 6th either way due to TH being active. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Whoops my bad.... i forgot it shows selected gear on the right &amp; truck down shifted on the left probably based on speed, weight &amp; drag....</div>
 
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