3.72 rear for 1949 kb2


The old and reliable.

Rookie
Rookie

Posts: 13

Joined: Thu Aug 02, 2018 12:19 am

Post Mon Aug 27, 2018 9:26 am

3.72 rear for 1949 kb2

Hello! I am looking for the optional 3.72 rear end for my 1949 international kb2. I believe it would be 41 teeth on the ring, 11 on the pinion. It should be stamped as well on the pinion shaft, by the u-joint. You can also determine ratio by chocking one wheel, and turning the other 10 times, counting the driveshaft revs. I guess I realize that this is pretty hard to find... is there another ring and pinion set that would bolt right in (GM Willys, Ford, etc? ) ..? I haven't found any manufacturer that makes anything like this (my ford model A has a high speed rear end kit from Little Dearborn) ...Maybe another year that is compatible? I've checked Windy Hill, French Lake, and others here in Minnesota..I've got the 4.18 in right now, and she pulls uphill pretty well with a fresh engine and slightly over sized tires, but I want a little more top end. Getting a set custom cut is just waaaaaay too expensive for a production run of one.....wonder what kind of market there is for this....Thanks, and take care! Mike

Site Admin
Site Admin

Posts: 4826

Joined: Thu Nov 29, 2012 9:10 am

Location: Nampa, Idaho

Post Mon Aug 27, 2018 12:00 pm

Re: 3.72 rear for 1949 kb2

Mike, That gear set is almost as elusive to find as "drums" for the 6x7 1/4 bolt spacing on the larger pickups.

Pile of Parts
Pile of Parts

Posts: 38

Joined: Sat Feb 23, 2013 7:56 pm

Post Mon Aug 27, 2018 12:54 pm

Re: 3.72 rear for 1949 kb2

See my post about swapping 4.18 rear axle for a Ford Explorer 3.55 8.8
viewtopic.php?f=7&t=8931&p=68224&hilit=ford+explorer#p68224
Ford Explorer 8.8 3.55 rear axle to K1

Rookie
Rookie

Posts: 13

Joined: Thu Aug 02, 2018 12:19 am

Post Thu Aug 30, 2018 12:28 am

Re: 3.72 rear for 1949 kb2

Thanks for the replies! ...I had heard of swapping out the axle for a Ford...that may be a good option. Parts are really harder to find than I thought.. ( I am using a vintage 6 volt Ford fuel sender and oil pressure sender...and one of my valve springs is off an old Jeep..a half helix shorter and wound the opposite way, but it works great!!....) I know a lot of guys seem to be either rodding or modifying these trucks....more than are restoring them... seems there would be a few extra rear ends left behind in the process...was the taller gear set just not as popular an option back then? Mike
User avatar

Golden Jubilee
Golden Jubilee

Posts: 4628

Joined: Thu Nov 29, 2012 11:47 am

Location: Bothell, Washington

Post Thu Aug 30, 2018 10:19 am

Re: 3.72 rear for 1949 kb2

Supposedly the 3.73 was installed in 3 speed column shift, and 4.11 in 4 speed floor shift,

But as always nothing is absolute with IHC
Gentle Men! you can't fight in here! This is the war room!

Rookie
Rookie

Posts: 13

Joined: Thu Aug 02, 2018 12:19 am

Post Tue Sep 11, 2018 10:25 pm

Re: 3.72 rear for 1949 kb2

truck resized.jpg
Pic of how she looks!

Site Admin
Site Admin

Posts: 4826

Joined: Thu Nov 29, 2012 9:10 am

Location: Nampa, Idaho

Post Wed Sep 12, 2018 12:13 am

Re: 3.72 rear for 1949 kb2

Nice!

AZD

User avatar

Golden Jubilee
Golden Jubilee

Posts: 575

Joined: Mon Apr 06, 2015 11:00 pm

Location: SLC, UTAH

Post Wed Sep 12, 2018 8:19 am

Re: 3.72 rear for 1949 kb2

I have wondered if the 3.73 came in 3-speed trucks. At least one trans model has a ratio of 3.5 or so in first gear. Seems like a good candidate for a higher rear ratio beacause it’d be similar to a 4.11 axle with the 3.09 second gear on the 4-speed trucks. Just a thought.

Pile of Parts
Pile of Parts

Posts: 46

Joined: Fri Nov 11, 2016 11:50 am

Post Tue Nov 26, 2019 8:52 am

Re: 3.72 rear for 1949 kb2

hello to you. I see that many of you are using diff. explorer 8.8 of 3.72, on my side I used a diff. from gmc canyon or colorado of 2005 --3.72--with wheels of colorado of 2010 to have a 16po and installed the same tires that I had on the truck and everything is perfect the springs arrives at the right place and the drive shaft too and the Intalled width is the same as the front wheels. It costs $ 1200.00 $ 500.00 for the crankcase, and new drums, brake bands, hand brake cables, wheel cylinders and a new drive shaft. the width is the same as the front wheels ext. 65 ''
i did use google for traduction
Marcel
ps: difference between 3.72 and 3.55 is about 2 miles per hrs

Return to K and KB

Who is online

Users browsing this forum: No registered users and 1 guest

Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF.