HOW TO CHOOSE THE RIGHT RATIO

Andy The Kenworth Guy
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[@bambam6053]

By far the best truck channel out there wish you was in the states

[@AndyTheKenworthGuy]

Many thanks!!!

[@neteaadrian1654]

Thank you for the video Andy. Thus was a good Information video.

[@RESTLESSW900L]

Very good information Andy. Not to many people talk about it. 👍🏼

[@AndyTheKenworthGuy]

It's the basics

[@danielk09]

Wow I love this video. Please do more explanations like this, it's very helpful for me.

[@masterdriver30]

Very good information.. Thanks for the great information..

[@donrilett8982]

I always look forward to your videos Andy, trucks or no trucks. Enjoy your "work" vacation and safe travels my friend.

[@AndyTheKenworthGuy]

Happy to do it Don! Hope all is well with you and Jackie!

[@blessingmafodya4544]

Thank you this video helped me very much

[@greenthumb6875]

Love the information, thanks

[@AndyTheKenworthGuy]

Glad it was helpful!

[@Donald_Shaw]

Thanks Andy for the video.

[@AndyTheKenworthGuy]

No worries

[@ivoryjohnson4662]

Please do more of these!!!!

[@AndyTheKenworthGuy]

Will do

[@dansmith7125]

I'm curious about spec'ing out a w990. 605 cummins, 2050 tourque, 22.5 tall rubber, 18 speed manual, with 2.93 gear ratio. My calculations that would be approximately 1350 rpm@ 75mph. I pull a reefer TX to WA back to TX. I'm generally grossing 80000 lbs. Would this be a good setup for running 70-75 mph and trying to obtain somewhat of a descent mpg? Is 1350 rpms a good rpm for that engine? Thank you for this video. Alot of drivers doesn't take any of this into consideration when spec'ing out a truck.

[@trucksntips]

I hope everybody watches this, its great stuff. Its a little picky on my end but I have had it factor into some decisions in the past. Is rear axle manufacturer Meritor and Dana Spicer don't always offer the same ratios its minor sometimes one has 3.71 and the other 3.73 but still can be a little bit of a factor. Love the added production to this video.

[@AndyTheKenworthGuy]

Glad you enjoyed it Matthew. Happy selling!!!

[@trucksntips]

@@AndyTheKenworthGuy Same to you all the best

[@steveguzman19]

Is there a big difference between Meritor and Dana Spicer axles, do both come with rear lockers, is Meritor/Dana better at one application than the other?? Is it best to stick with Standard Equipment if they all have the same weight rating??

[@noxtrucker2747]

Great info. Tanker spec ? GCWR 108K 18spd, 24.5, avg cruise low 70s running occasional valleys

[@IRISH4486]

I’M RUNNING MY CASCADIA .. DD15 , 13 MANUAL . 505HP. 3.08 REARS . I RUN WEST COAST GENERALLY. AVERAGE IFTA MILEAGE IS 8.15- 8.46 MPG . I GENERALLY RUN 68-70 MPH . RPM ARE AROUND 1300 -1400. TIRE SIZE IS 22.5 …. SOMETIMES I WISH I HAD A DIFFERENT REAR RATIO UNTIL I HAVE TO PUT FUEL IN IT … MY TRUCK IS 2014 MODEL YEAR WITH 936K MILES …

[@johneufrazio8349]

KENWORTH GUY THANK YOU ! ! ! NOBODY COVERS RATIO s I NEED TO WATCH THIS U2 4 or 5 TIMES MORE ? ?

[@AndyTheKenworthGuy]

You're welcome!

[@roburquhart2350]

Never knew Cummins power spec existed. Thanks 👍

[@AndyTheKenworthGuy]

Yup

[@igortereshchenko5675]

I always debate on ratio. I do Lincoln, NE to Tacoma, WA. Would you suggest 2,64 or 3,08?? (Up to 80k lbs). I know how 2,64 feels, but never done 3,08. I will go 65-70mph

[@KB-gs8zi]

Hey Andy !! Hope you got to see ""Sergei's "" video when he was invited to go to the ""EATON"" test track & drive those rigs that were setup different ?? The "PETE"" was setup with 2 speed rears pulling a ""B"" train !! Don't know if those are available for installation in a ""NEW KW "" or NOT ?? Have a good VAC. seeing your Customers !!!

[@AndyTheKenworthGuy]

I can offer a 2 speed rear end. Don't think I've ever sold one though,.,

[@KB-gs8zi]

@@AndyTheKenworthGuy OKS ! From watching the video.. That compo would work great on the Coachulla hwy in BC!!! Can you imagine a 605 HP Cummins with an 18 speed tranny ?? WOW

[@acd1202]

It's interesting how short you gear trucks over there considering the speed you can run at, I wonder if increasing fuel costs will change this over time? For comparison in the UK an MX13 480 or 530 in a DAF with a ZF Traxon 12 AMT running at our normal 44000kg (96400lbs) at the EU mandated 90kph (56mph) limiter, will come normally with a direct top, 2.21 diff on 315/70R22.5 tyres giving just over 1000rpm on the limiter.

[@greenthumb6875]

44,000 kg is equal to 96,800 foolish American pounds. Wish Ronald Regan would have had more intelligent teachers in the eighties or forced them out for refusing to learn metric, we would look a whole lot smarter. Like he did with air traffic controllers.

[@acd1202]

@@greenthumb6875 actually it's 97020lbs

[@AndyTheKenworthGuy]

Very interesting

[@johnvelas70]

thoghts on the Allison RDS for maintenance issues/failures?

[@christophercriss5888]

Those ratios are for optimal fuel milage but you hit any kind of grade,,,not to mention a 5 or 6 percent hill or mountain your gonna be going 15 mph up that grade,,,,need 3:73 rear ends with a 13 or 18 speed manual,,and 565 hours 1900 to 2300 foot bound of tork to pull hills at a good speed and still maintain 6 to 7 mpg

[@Bendigo1]

I used to think that too, I used to think 3.70 was low. but i now drive a truck with 2.97 and it pulls 6% at 80,000 at about 35 mph. i had a truck with 3.72 that wouldn't do that even with the same hp engine. Not sure if it is the transmission gearing making up for it or what, but it was surprising.

[@christophercriss5888]

@@Bendigo1 80,000 at 35 mph isn't good my friend I have a t680 with 500 x15,,,,12 speed auto,,,,and I prefer 18 manual,,,but it has 3:70 rear ends and pulls all hills at 72 mph,,,,but one big key is my truck isn't governed at all I can start up hill at 80 mph and maintain 73 mph being heavy,,,,company trucks are slow and weak ,,and that cause huge traffic jam ups

[@Bendigo1]

@@christophercriss5888 I did not say it was GOOD i was surprised that is was not worse

[@christophercriss5888]

@@Bendigo1 copy that

[@hudsondonnell444]

@@Bendigo1 If you have 2.97 rears, your transmission most likely is a direct drive. A direct drive transmission will have a 2050 or 2250 driveshaft and the gear ratios will do a better job of multiplying the torque up to the direct drive which will be very close to the engine specs. If you run an emissions truck the engine is going to put heat into the oil at a faster rate climbing grades than a pre-emissions engine.

[@MrAdoii99]

What is needed for a 3.85 ratio spec wise 80k weight driving all around america cruising 68-72 mph if able

[@Bendigo1]

That is way too high for those speeds, you would want a 3.55 or lower to keep the fuel mileage reasonable.

[@7viewerlogic670]

Thanks for the info. Anyone know how much one Diff Lock costs from the factory?

[@AndyTheKenworthGuy]

About $1300 per axle

[@7viewerlogic670]

@@AndyTheKenworthGuy Thanks for the reply Andy, I know you are a busy guy.

[@eduardoyanez4726]

Good morning. Hey man I have 96 Pete. 18 speed trans ds 402 Eaton 3:55 ratio 11R 22.5 tires. And what choose u think is good. Because I’m think change rear clip tandem because the 402 is too old. Only when I’m looking for more new rear clip sale used. Not see 3:55 I’m see more3:35,3:42. 2;79 etc. I’m looking similar I have ratio. Have a great day

[@SinOjosWeb]

I have a 3.36 rear ratio when in 8th high. Which is a .73 ratio in a fuller 18 speed. Gives me 75 mph at 1,525 rpm. That is about as high of an rpm you want for going distance. If you want to go 80 mph. A 3.06 would be better. Because 80 mph with 3.36 rear & .73 tranny, will be 1,620 rpm. Not really to high of an rpm. The faster you turn it, the worse your fuel mileage will be. Plus higher rpm equates to more wear. All depends upon how long at what speed. Running in the flats or climbing the mountains. I run every where. Flat & mountains. The 3.36 allows me to cruise at 75 mph. Fairly decent fuel milage, not turning to fast. Since I am at the top of the power band, at 1,525 rpm. Small hills no need to downshift. In 8th low at .86 tranny gives me 1,790 rpm at 75 mph. So I can drop a gear and still stay at 75mph if the hill is not to steep. Without over reving. I would not want to rev that high for long periods. Due to fuel consumption & wear. Fine for short periods to blast by the slower hill climbers. Do a Google search for "Fuller 18 speed". You will get a link to the brochure that provides all the gear ratios. I have played with some of the online semi speed ratio calculators. They are never close to what I see in the real world.

[@flatbedvlogs9318]

Hi andy want to book a truck how much down payment needed and waiting for W900L 18 spped cummins 565 2050 Please reply am very thankful to you

[@AndyTheKenworthGuy]

Hello, please contact me on my cell by text.. 204-293-9180 to discuss further

[@victormejia512]

Generally I drive tandem but tridem is much heavier gear ratio needed 336 12 speed should be more effective

[@edgartaylor7421]

How do you build a Kenworth, their website won’t let you build a truck.

[@timcrawford5882]

There's is a mathematical formula your dealer has for your particular application

[@AndyTheKenworthGuy]

I know.. I cannot find it but I did have it on my computer somewhere but it is gone now. 😢

[@wbball15]

Hope your restrictions go away soon. Great stuff, Andy.

[@AndyTheKenworthGuy]

I hope so too

[@Khan-vm3vy]

I need your help

[@xpany2cardsxp]

100k 50/50 on hwy and off road 74 8LL trans 11r 24.5 in thinking 3.91 ot 4.11s

[@alanbradbury3427]

Kenworth is the best truck on the road I used to have a Kenworth and it was a 990 l and I really like that truck I wish I had it today but I had to retire because of a back entry and leg increase so now I have to live with that in an AFC home

[@dwjunior]

👍👍👏👏🚛🇺🇸