4:11? (1 Viewer)

[Mrpoopypants]

What is the stock gearing in a 78 FJ-40?
4:11 is what comes to mind.
If they differ, how can i tell what mine are?

Thnx

 

[Cruisergreg]

That year might 3.70.

 

[Poser]

Pull the rear cover, and count the teeth...that would remove all doubt.

If this truck has not been messed with by a previous owner..I know, ha ha ha, but this *should* have the much saught after and coveted fine-spline 4.11 gear set, as in the USA, depending on the month of production, the 3.73 ratio was not in the 40 series until the 79 modle year, which could have started in 08/78...

There is a tag on the passenger side bulkhead that has an axle/gear ratio code..
Should have a 'K08' which would be 4.11, or a 'K05' which would be a 3.70...

But I still think that removing the cover is the best way to verify a gear ratio...

Good luck!

-Steve

 

[s79bj40]

why did america get covers on the diffs and we didn't? I have never even seen a cruiser with a removable cover, they are all welded closed and if you want to count the teeth you need to remove the carrier. It would have been nice to have a look see inside.

sam

 

[Toyoland66]

You are acting like you all got screwed by not having removable diff covers......

The reason your are welded up is because they are full floaters, US landcruisers got semi floaters in the rear and the cover needs to be removable to get the C clips.

I'll trade if you want.......

 

[s79bj40]

must just be cheaper welding the back on, just be thankfull you dont have a landrover, mine has semi-floaters and there is no access cover.

 

[Poser]

9" Fords, and there are other axles out there that are the same way...

Really not that big of a deal...

Good luck!

-Steve

 

[Mrpoopypants]

OK, I checked the plate on the fire wall:
Trans/Axle = H42 K082

Plate on the door frame:
Nov 1978 :-\

And I do have a removable cover on the rear.

A-B+C=4:11?

 

[woody]

I know of someone who ground off their front welded diff cover, drilled and tapped it for a rear bolted cover, and did it that way...neat idea.

Mort, you need to count driveshaft rotations. Put the rear axle on jackstands, put the t-case in neutral, and rotate the driveshaft by hand. if it takes more than 4 revolutions to spin the tire one rotation, it's 4.11. Less means it's 3.73.

 

[incogrhino]

My 12/78 fj40 has the 4:11

 

[FJ40-GARAGE]

My 4/1977
has 3.70 and Drumbrakes on the Frontaxle..............

Okay......... it was bought in Germany .......... made for the Autobahn.

With the Original Tires that was easily good for a 100 m/pH .

 

[yooper]

It's not 4:11, it's 4.11:1

The : indicates a ratio, so 4:11 means "a ratio of 4 to 11", when in fact we mean "a ratio of 4.11 to 1"

This is trivial nomenclature, but I'm a trivial kind of guy.

 

[cpip]

What are the higher gear ratios (lower numerically) that could be swapped into a '69? I am looking at a diesel swap and need to lower rpm's and raise road speed.
Are new gears a possibility?

 

[bad_religion_au]

the 3.70:1's should bolt in should they not???