Congrats to Div: You are one of the last guys who consequently uses old school physical and math stuff to use it in real life. Good luck with finding the right diff - see you next time 👍

Your quite a math teacher, need more of your kind in the public schools

I’ve learned more watching this channel than from any other on KZfaq!

Very cool. Yes absolutely let’s use our brain. Keep on keeping on my Brother. ✌🏻👍🏻 happy to have spent a little time with you

You would make a great teacher. I studied mechanics years ago and you have a very good way of explaining the process.

Brother, this lesson reminded me of my high school days, feel like going to the corner hang out and have a smoke with my friends. Thanks for not giving us any homework. But do pay attention Youn ones IF YOU WISH TO WORK IN A TRADE YOU WILL NEED TO KNOW MATH! You will thank us OGs later on in life. happy hunting Brother. mike

I've recently been going back through videos. This video is very informative. I wish high school math would have been this interesting. Thank you for taking the time to not only entertain, but to educate. As always, much respect from the states.

This is the kind of video that makes you GREAT in my opinion. Thanks.

Hey Div. That was one math lesson. Now, I just have to remember what you said. HA-Ha. That is a lot of RPMs for 68 km. 2000 Rpms at 100 km sounds like a good speed. Thanks for sharing.👍👍🍁

Thanks Div , you are the first person to fully explain this to me , I greatly appreciate your approach with hands on mathematic explanation Greatly enjoy your channel . I'm always learning from you even tho I'm 60 years old

Brilliant, looking fwd to next installment.

Thank you so much for explaining the diff ratios in a way that was understandable and showing us in its simplest form , I’ve learned something today 👍👍

Hang in there Duff, your channel is going to keep growing because it’s informative and you build cool rat rods !

Jou skoolgee is heel befok oom Diff. My favourite Sunday evening educator. Thanks again.

Hey,brother check the dent side ford diff. The one you pulled the bedsides off of for your last project, some of them are geared towards high way speeds like 2.76 up to a 3.08

Dear Div 👍👌👏 Very well explained, Sir, very well indeed! Best regards, luck and especially health to all of you.

Well explained for those who don't know and may be interested.

Diff you are a very good teacher !

Professor Div. Thank you for your understanding and demonstration of how to figure out the diff ratio!

Hey Diff. Just found something for you..lost car rescue season 1 ep 5..watch ten mins before the end..but the whole show 👍. Its a cool find. Have a lekka week Boet. Sun's starting to appear in ole Sweden.

Awesome definition, easy to understand, thanks for sharing, all the best to you and your loved ones

Wow that's one way to do it. Very entertaining. Can't wait to see more videos soon. Keep up the great craftsmanship and hard work my friend Fab On. Weld On. Keep making. God bless.

Happy Hunting Div Lekka

I love the Ole skool calculations, it's how we did it before the internet, now you can run your numbers in the Spicer gear calculator and get the mph to rpm ratio, it saved my old head a lot of aspirin, lol

Hi uncle, Jah nee, the tire profile makes a big difference, when I was still doing oval track racing the tyre profiles made a massive difference in my speed in the straight line, but in the corner I don’t want to shift gears so at the end the 13 inch tyres we used had us playing around with profiles instead of diff ratios, Thanks for the lesson, Be blessed Ciao ciao! 👋

Love going to school with Professor Div

Nice video! I like that you used old skool common reasoning. Keep the videos coming! Enjoy!! Can't wait for the next one.... sure it will teach me much.

Here but watching some fabulous Women's Cricket from Boland Park stadium in Paarl, South Africa. on the TV... wearin my Rust Never Sleeps shirt, with my cuppa... life is doing okay today... looking forward to learning more from your latest video... I am very grateful for your ability to take us along for the journey. thank you Div 😎

Great job explaining. Learned a lot. You are a great teacher

Wow Div I think my brain just melted, but I’m terrible with math. After watching it couple of times I finally started following the method! Thank you Sir for another great video 👍👍👍

Wow Boet we all going back to school with professor Diff. Thanks for this interesting way of explaining the pros and cons. Take care and great to see your wife lending a hand or two.

Thank you Professor! Beautifully explained.

I understand your desire for a different diff for a reasonable cruising speed at a realistic RPM, BUT with that diff that truck would be a beast off the line.

Howzit Div, thank you for explaining in a manner that even I can understand the difference in difs and All and all... 🌽Have a blessed lekka week a head 👍

yet again a very interesting explanation lesson today. thanks en Nellie heel erg bedankt voor de hulp in de werkplaats. baie dankie vir die hulp in die werkplek.

Great video Div, awesome explanation on how to calculate the changes needed.

Tons of great info! You’re a helluva teacher!!!

Amen Brother!

I could swear she rotated 11 times. Maybe I'm wrong. The concept is sound! Thanks for the info. Now I wanna know what my diff is for my 69 Datsun 510!

Wow....! Diff You the man.... We spoke about something similar not to long ago. I see you were way ahead of me.. Hopefully you see this response.... One thing I need to say here is that as we view the U Tube videos these additional vides do not appear at the time.... So please proceed....all due respect..

Thanks for sharing Diff. You brought the 'pi' .... I guess we must bring the ice cream. Hopefully the dairy bar attendant has basic math skills; if the computerized cash register goes down. As a backup we will being exact change, including tax. We don't think you Wife would appreciate melted ice cream.🍦🍨

Great job explaining ratio

Good to see you Div, thanks for the lesson. Time to hunt for a faster rear-end. Good luck my friend. Take care and look forward to seeing what you find. Have a Lekka day Boet. 👍

Good work Div. This video made me think you may have been a shop class teacher at some point.

I enjoyed this mental exercise. I may wrong on dates & numbers but, 3 years ago 80% of the high school students who graduated Boston public schools could not tell time on an "Analog" clock! I guess is, they won't be able to get to work on time, be too late for dinner and miss the buss to see their girlfriend. This is sad! But without looking, 88km = 55MPH. Best of luck finding a differential with a ration below 3:1 that fits. Or perhaps some 2 meter wheels w / tires! 😮❤

Very educational! Thanks Div.

Hey Boet..Good day at school. Thanks for the lesson..yep that diff Diff pretty high geared.. you should have said what the original running gear would do top end.. you be able to do some good burn outs .lol. Good luck with the hunt.. have a lekka one Boet.

Thank you sir, old school system. It is works. Yes in feet and inches works great too. Lol

Another great video 👍 Love it! That's gonna be one screaming 351 😁

Thanks Div.

Thank You 👍🏼

Old school sweet

Diff great teaching on diffsratios😁😁😁 reckon you might wanna look at a 88 to 92 or maybe even 96 ford courier 2wd diff as they carry low ratio diffs...here in South Africa they plentiful 👍👍👍

Growing up, that’s how my father answered questions. He taught math. 👍. Thanks for the fun.

I wondered what that little metal piece was on the frame. Now I know

here in the states that engine set up would be in a mustang or torino, cougar etc. 3:50 to 3:73 is perfect.

I'm impressed how you have worked through this so quickly.

That is the first time I seen someone double the pinion rotation. I had a 64 Plymouth with a 2.76 rear gear ratio. When I spun the wheel around, the pinion went around 2 and about 3/4. So that showed a 2.76. I can’t remember the rpm to mph. Great video. I like it that you go through your thought process. It really helps out. Good luck finding what you want. I too am looking for another ratio for my Falcon. I want a 2.79 out of a 70’s Ford Maverick. That will give me a 5 lug pattern too. 👍🏻👍🏻!!!!

Awesome morning brother thank you for sharing your knowledge with us !!!! Wow !!!! It's amazing watching you explain how simple the ratios can change with simple changes !!!! I've done the things that you are explaining but never actually did the math and broke it down like you have done for us !!!! It's awesome to hear knowledge that will actually benefit us !!! Thanks for sharing your Ole school wisdom brother and thank the wife for being patient with you and helping because I was trying to help you but I got confused quickly lol 😂 !!! You are truly an awesome technician brother !!!! Again thank you for sharing your time knowledge and videos with us brother !!! Until the next video !!! Have a lekka one brother !!! Say hi to everyone for me !!!!

4-11 or 4-56 would be good quarter mile Differential. You are very Cool, loaded with knowledge and experience in teaching! Thanks good Video!

It's always a great day when you share another video Div! And what a great way of explaining these things, thank you so much man. I'll keep my fingers x'ed for you finding the perfect diff for this cool project! All the best!

Hello Div begin nou na n mooi trok bou lyk lekker dag vir jou

Just want to say God bless you biif

Thanks for the brain exersize . Lol you thought through every sinerio . Very good job played with this a bit myself over the years lol i ran 52 in tires with 4:11 gears gave me like a double overdrive . So hears a idea now ive run stacked transmitions since i was a lad . There a bit hard to find bit i was watching vidios for ideas and this canadian chap took a 4 speed fliped it backward added a suport bearing pillow block bearing he used

Thank you for another great video!

Part 7 of 1939!!! C’mon Diff you need to get a move on man… I can’t wait that long to see you finish it, it was going along so well soo far!!😂😂😂 have a lakka one mate👍

Lot of pinion gears have the number of pinion teeth and proper ring gear to be used stamped on the front of the pinion which may be faint

SOUNDS GOOD TO ME.✌✌👍👍🏁🏁🏁

Thanks Diff for another educational show.

Gee well done diff

Great tutorial Div👍🇺🇸🤘🔥🔥🔥

Ford Borg Warner 2.92 or 3.01, perfect cruising ratio's, there's plenty of Aussie Falcons in S.A, drum or disc brake.

Great Video Div!

Lets goooo Boet!!!

That's definitely a bit low for a cruiser! Burnouts would be easy though!😃

really learned alot watching you figure this out. It made a lot of sense but now I have a headache!! :) Thanks for the great videos.

Wake me up when it’s over ⚡️

Great vid Div, well explained.

You forgot to mention if it's a posi or a locker rear end you don't multiply it times two way I learned it radius * 2* 3.14 is your diameter of a circle thanks for taking me back about fifty years in math class in 6 grade

Mrs Richards: "I paid for a room with a view !" Basil: (pointing to the lovely view) "That is Torquay, Madam ." Mrs Richards: "It's not good enough!" Basil: "May I ask what you were expecting to see out of a Torquay hotel bedroom window? Sydney Opera House, perhaps ? the Hanging Gardens of Babylon? Herds of wildebeest sweeping majestically past?..." Mrs Richards: "Don't be silly! I expect to be able to see the sea !" Basil: "You can see the sea, it's over there between the land and the sky." Mrs Richards: "I'm not satisfied. But I shall stay. But I expect a reduction." Basil: "Why ?! Because Krakatoa's not erupting at the moment?"

Awesome! Nou het ek iets geleer. Dankie!

If you can find it, 3.55:1 is a great ratio, with lots of torque at highway speed. Chevy has 2.73:1, and is common

I have been a professional mechanic/technician all of my life and the funniest thing I’ve ever heard is “you won’t ever use math after you get out of school! 😂

I counted Wheel 11 both times even play back to check

KEEP UP THE GOOD WORK BROTHER !

Rim size and tyre aspect ratio is what I played with to lower the rpms on my pet car I took 500rpm off in top gear at 100kmh cheaper than an overdrive gearbox , you need about a 3;1 for that engine, Hunt down an old Falcon I know you had Ozzy Falcons there

i think i counted 11 turns on the tire , its early for me tho , this truck is cool as hell , be safe buddy

Hi Div, if you'd have thought me maths I'd have paid more attention using engine rpm, transmissions and diff ratio id definitely stay in class 😂😂. Would the Jag have a better axle,might not be the diff for the axle in the truck

Div, where you a school teacher in your younger years? LOL! Great explanation and demonstration on finding and calculating gear ratios. Keep it coming brother!

Hi Diff, I had a HG Holden V8. It had a 2.89 diff ratio and was great cruising speeds. I think was around the seventies. Might be too weak for a 351. you might have to look at a Ford 9 inch centre diff.

hey BUTT , great info to know . im still awake nz . [but google] ya know .... {have to be careful what we say in these times ...

I have always just seen it done by counting teeth in the diff and dividing. Maybe I am wrong but I think your diff is about 2.73-1 ...Lekka Boet

Transmission is 1/1 but the torque converter doesn’t lock up so you never get a true 1/1.

Wow great stuff Werner from Great Brak, still want to no where you are situated thanx

Lets try this again . Stacked transmitons one forward one backward . Lets say a standard 4 speed no overdrive backwards gives you a overdrive the ratio of the gear reduction for 3 gear . 2nd the same making a double overdrive . Their are vidios on this . From what i can see they added a pillow block to the pilet shaft and used a old clutch they machined down to fit the drivline and welded it in . Tractors run stacked tranys for underdrives, my 1 truck had stacked tranys had a winser 3 speed 22 %over with 50 %under. If you use a trany with overdrive the overdrive becomes a underdrive . Theirs tons of options .

Here's the formula for calculating gear ratio: (RPM x Tire Diameter Inches) / (Final Drive Ratio x Transmission Gear Ratio x 336) = Actual numerical gear ratio to the ground from every revolution of the engine

That's almost how I do it too. I have the wife rotating the tire 20 turns (other wheel on the floor). So if the prop shaft turns 34-and-a-bit, I know I probably have a 3.42:1 rear end ratio

Div with the C4 the engine should be 1500 rpms at 55mph or 88.5 km/h using 3:73 gears depending on tire size.

Hi Div. I like this Hudson truck you are working on now. So far , it is my favorite. I am working on my 54 Chevy aka Ol'Beater. I have a question. My door vent windows are terrible. Replacements are very expensive. I am toying with the Idea of converting them to one piece glass. Have you ever done this?. Do you have any Ideas?. Keep on Trucking...love your channel. JB

I just bought a 1964 f250. The previous owner was originally from South Africa. He didn't admit to knowing you. He obviously didn't deserve to keep the truck.