3.73 ratio third members from a FJ60 to an FJ40

brooklyn · 06-19-08, 07:34 PM

I was reading on the main MUD site that using a 3.73 diff from a FJ60 would give me a better highway driving than my stock gears - 4.10s.

I am running a V8 with an SM420 and was wondering what "improvement" I would get. Has anyone done this or know anything about how this might change my ride.

Any ideas,

dreko · 06-19-08, 09:17 PM

Hey Joe
I've read the exact same thing... 5 speed, and 3.73 will allow higher speeds, lower revs...
I wish I knew what was involved in doing the gear swap tho...

A

woytovich · 07-15-08, 08:21 PM

Swapping diffs 60 to 40 is nothing except putting them in and dealing with the different driveshaft flanges... can be done in a number of pretty simple ways... Oddly I have 2 FJ60 diffs sitting here on Long Island looking for a new home... ;-)

Mark

06-19-08, 07:34 PM	#1
brooklyn IH8MUD Junior Join Date: May 2007 Posts: 140	3.73 ratio third members from a FJ60 to an FJ40 I was reading on the main MUD site that using a 3.73 diff from a FJ60 would give me a better highway driving than my stock gears - 4.10s. I am running a V8 with an SM420 and was wondering what "improvement" I would get. Has anyone done this or know anything about how this might change my ride. Any ideas, __________________ Joe Brooklyn, NY 67' FJ40

07-15-08, 08:21 PM	#3
woytovich IH8MUD Lifer Join Date: Sep 2003 Location: Metro NY TLCA# 8334 Posts: 1,352	Swapping diffs 60 to 40 is nothing except putting them in and dealing with the different driveshaft flanges... can be done in a number of pretty simple ways... Oddly I have 2 FJ60 diffs sitting here on Long Island looking for a new home... ;-) Mark __________________ Mark [ mark@woytovich.com ] Metro NY Founding member, Gotham City Land Cruisers 85FJ60 ~ 78ishFJ40 ~ M-416 ~ Trillium 4500

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06-19-08, 09:17 PM	#2
dreko IH8MUD Rookie Join Date: May 2008 Posts: 62	Hey Joe I've read the exact same thing... 5 speed, and 3.73 will allow higher speeds, lower revs... I wish I knew what was involved in doing the gear swap tho... A