Reply
 
Thread Tools Display Modes
 
Old 01-30-2019, 08:29 AM   #51
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,446
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
You are in luck. In the "olden days"...Chevrolet stamped the ring gear with the actual tooth count. That is what the "6 & 37" are in your first pic. That puts your ratio at 6.166 : 1.



Mighty low and maybe good for 45-50 mph tops.
Tango is offline   Reply With Quote
Old 01-30-2019, 11:18 AM   #52
Bus Geek
 
o1marc's Avatar
 
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 5,197
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Quote:
Originally Posted by Mekanic View Post
The absolute most accurate way to determine the gear ratio is to count the teeth on the ring gear, count the same on the pinion year and divide the ring gear number by the pinion number.
Which is great if you have it apart, but not much help determining what it is while sitting in the driveway. Easiest way to determine is to jack up the back and turn the rear wheel and note how many revolutions it makes compared to the revolutions of the driveshaft.
o1marc is offline   Reply With Quote
Old 01-30-2019, 11:37 AM   #53
Mini-Skoolie
 
Join Date: Apr 2016
Posts: 20
I did that but watched the ring gear more so than my tire. One rotation of the ring gear made the driveshaft turn 6 times
spiritjohn is offline   Reply With Quote
Old 01-30-2019, 11:41 AM   #54
Mini-Skoolie
 
Join Date: Apr 2016
Posts: 20
If the 6.166:1 is my ratio and only lets me go 45 as a top speed, could I have it regeared in some way so I can go a bit faster than that?
spiritjohn is offline   Reply With Quote
Old 01-30-2019, 12:04 PM   #55
Mini-Skoolie
 
Join Date: Apr 2016
Posts: 20
If I'm better off just buying a completely different rear end is there one I can just bolt on or will just about anything take some fabrication to fit
spiritjohn is offline   Reply With Quote
Old 01-30-2019, 12:05 PM   #56
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,446
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Depends on what is available for your axle. There may or may not be taller factory gears. There was NOT for my '46 so I swapped the whole rear end for a late model Dana 80. Stout and plenty of gearing options plus disk brakes. Post war trucks may have a few more choices but it will take a little homework to discover what factory stuff is out there. There are also some custom gear services that make wider ranges for some makes & models (depends on popularity).



Happy hunting and best of luck.


BTW...I was only guessing at the 45-50 mph. You need to run all your numbers through a gear calculator to determine what speed at what RPM.
I use the set below. The one at the very bottom of the page is excellent and you can play "what if" with any of the numbers.


http://www.csgnetwork.com/multirpmcalc.html
Tango is offline   Reply With Quote
Old 02-01-2019, 10:29 PM   #57
Bus Crazy
 
Elliot Naess's Avatar
 
Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 2,239
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
About the rear bumper of your Blue Bird, if it should be for sale.... Well, dang... I was in Medford two weeks ago! But I'm only a tad over 300 miles south of you. And I may visit my friends in Medford again this spring.

Interesting project you are working on!
Now... your old bus must have a stick shift? Since you are accustomed to that... might you want a stick shift with the new setup? If so, you can get stick transmissions with an overdrive ratio in the top gear.
__________________
Elliot
Millicent The Bus - roof raised two feet, toy-hauler tailgate.
http://www.skoolie.net/forums/f11/th...gate-1564.html
Elliot Naess is offline   Reply With Quote
Old 02-10-2019, 03:37 PM   #58
Mini-Skoolie
 
whiskey runner's Avatar
 
Join Date: May 2018
Posts: 18
Year: 1946
Coachwork: Superior
Engine: C180 supercharged cummins
cool bus spiritjohn.. i will be watching your build for sure.. in my 1941-47 white bus i used a 70's international rear end i got out of a junk yard for 100.00.. i dont remember the exact gear ratio with 11R 22.5 tires it runs 65mph at 1900 rpm ..i usually get 14-16 mpg if i stay under 60mph which is very hard to do.. i have air brakes on my bus so not sure if you would want to go that route with yours
whiskey runner is offline   Reply With Quote
Old 02-10-2019, 04:39 PM   #59
Bus Nut
 
Sleddgracer's Avatar
 
Join Date: Nov 2018
Location: south east BC, close to the Canadian/US border
Posts: 662
Chassis: still looking for my bus
Whisky Runner - what product did you use to skin the exterior of you bus?
Sleddgracer is offline   Reply With Quote
Old 02-20-2019, 10:44 AM   #60
Mini-Skoolie
 
Join Date: Apr 2016
Posts: 20
I would sell that bumper, let me know when you're in southern oregon again
spiritjohn is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.