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Hello , just order new 2015 Laramie 1500 with 3.0l Ecodiesel , could any one tell me if it best to stay with 3.55 ratio or for a little more pulling power and torque should i order the 3.92 option ? Have seen a few guys say could use a little more pulling power up grades. I have a 26 ' enclose haulmark trailer with a 1966 pro street nova inside to go to car show and track in grand bend about 3-4 times a year, GVW =7500-8000lbs . I know will lower MPH a bit but dont want a dog either h.p is a little low but good torque , have never driven the truck yet on order so i have onlt a fews day to change ratio . Thanks for any information:)
 

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that's a pretty stiff load for 3.55's but would probably deal with it fairly well on an occasional basis over level terrain. Depending on configuration, you may find that weight exceeds the tow rating with 3.55's if that is important to you. While I've yet to see definitive side by side comparison tests of the two gearsets, mathematical computations would point to app a 10% reduction in fuel economy with the 3.92's. Just depends on where your priorities lie. Congrats on the new truck. When you get your Von/vin check in with spp at ramforumz.com & he'll give you daily updates on the birth of your new baby.
 

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depends on how far and long you are towing. it. The 3.55 will handle it just fine. However if you are going throught the mountains maybe the 3.92 will serve you better. Also if you are only towing it a few times a year id stick with the 3.55. If your like me. the truck is 95% daily driver and 5% towing
 

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Discussion Starter #4
Gear Ratio

Thanks guys for reply , I use a F 350 with 6.0L diesel now , so the new Ecodiesel will be a new step. I had read from a few forums were some had said that tranny would not shift much to 7 & 8 gear . Yes 90% of driving is no trailer , but when I do I have level bar on trailer plus on new truck going with air lift on rear. With the 3.92 did not want to increase rpm and down on mpg if not needed ,plus most of trip level ground and short hauls . Can any body tell how the power is for driving compared to hemi as per power range is there a big change >Thx
 

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Short trips on mostly level ground id say stick to the 3.55. As for the power vs the Hemi, the Torqe numbers are really close, but the diesel hit the 420FT/LBS of tq at 2K rpm vs the HEMI that has to wind up to 5K rpms. For towing you really cant beat the Diesels' power band.


Thanks guys for reply , I use a F 350 with 6.0L diesel now , so the new Ecodiesel will be a new step. I had read from a few forums were some had said that tranny would not shift much to 7 & 8 gear . Yes 90% of driving is no trailer , but when I do I have level bar on trailer plus on new truck going with air lift on rear. With the 3.92 did not want to increase rpm and down on mpg if not needed ,plus most of trip level ground and short hauls . Can any body tell how the power is for driving compared to hemi as per power range is there a big change >Thx
 

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Thanks guys for reply , I use a F 350 with 6.0L diesel now , so the new Ecodiesel will be a new step. I had read from a few forums were some had said that tranny would not shift much to 7 & 8 gear . Yes 90% of driving is no trailer , but when I do I have level bar on trailer plus on new truck going with air lift on rear. With the 3.92 did not want to increase rpm and down on mpg if not needed ,plus most of trip level ground and short hauls . Can any body tell how the power is for driving compared to hemi as per power range is there a big change >Thx
Speaking of Ford, it would be great if they finally released an F150 diesel and be on the same playing field as RAM
 

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You are one of the very few to go from a 1 ton to 1/2 ton truck. I went to the Eco from a 3/4 ton Cummins and it IS an adjustment.


You are getting good advice. the 3:55's will work. I have pulled 7K with mine up Carolina mountains with no lack of power. Actually had to slow down on one mountain as it curved a bit much for me uphill speeds.


The 3:92's were made to pull the load you are going to pull. It would be better but if you only do it for short runs and occasionally, it's probably a "push".
 
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