Landcruiser 40/60 Diff ratios

Submitted: Wednesday, Nov 12, 2003 at 22:40
ThreadID: 8489 Views:13019 Replies:2 FollowUps:10
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I'm doing up a '73 FJ40. As normal with these things, I'm not sure if it has 40 or 60 series diffs. I know rear is a full floater and has 60 series axles. Need to rebuild or replace front diff. Looking at a 2nd hand one from a 60's at the moment complete with discs. Ratio is 4.1:1.
In my FJ40 manual it says the US and Canada models are 4.111 and others are 3.700.
Is there a way to tell what ratio the diff is?
Are Australian 40's and 60's the same?

Not real keen to put the wrong ratio diff in!!! The car drives as per most FJ40 - motor screams over 80km/h. So I think it is a standard ratio. But what is standard?
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Reply By: Member - DOZER- Thursday, Nov 13, 2003 at 06:53

Thursday, Nov 13, 2003 at 06:53
Brendon
From what you've said, the rear housing is 60 series because the axles are longer aswell as the diff wider. It should be 4.11, only very few had the 3.7 over here in the full floater setup (fj55 1975) To check, jack up the rear diff and put it on stands, licipaper marks on the tailshaft and brake drums, turn the wheels one turn whilst counting the tailshaft rotations, 4 and a bit is 4.1111, a 1/4 turn less than 4 is 3.7.
BTW if you put the 60 front on, the spring purches will have to be repositioned on it to suit the 40. A set of 75 diffs are thesame width as the 40, and later ones had disc rear ends too.
The 60 diffs are best to use if you plan to lift her up. Wider track is more stable.
Andrewwheredayathinkwer mike?
AnswerID: 37117

Follow Up By: Tony - Thursday, Nov 13, 2003 at 07:27

Thursday, Nov 13, 2003 at 07:27
I think the 3.7 came in the 3 speed 40 series. When I fitted a Chev V8 to mine I change the ratio to 3.7 from 4.11. It was a 1976 model 4 speed.
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FollowupID: 26834

Follow Up By: Brendon - Thursday, Nov 13, 2003 at 12:13

Thursday, Nov 13, 2003 at 12:13
Thanks, I'll have to see if the diff housing I have now is wider. This car is a '73, but has a 4 spd and looks like a later model 2F motor.
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Follow Up By: Member - DOZER- Thursday, Nov 13, 2003 at 13:31

Thursday, Nov 13, 2003 at 13:31
Brendon, if it has 60 axles (which are longer than 40 ones, ) it has a 60 diff. Your 73 had from the factory, a semifloating rear end (like a hilux does now) and probably a 3 speed, but might have been 4. There is a 60 front diff on ebay at the moment for 300 bucks disc to disc (www.ebay.com.au)
Andrewwheredayathinkwer mike?
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FollowupID: 26879

Follow Up By: Brendon - Thursday, Nov 13, 2003 at 14:20

Thursday, Nov 13, 2003 at 14:20
Its the ebay diff I am looking at. Only problem is. I am in Vic, it's in NSW. Thanks
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FollowupID: 26885

Reply By: Outnabout David (SA) - Thursday, Nov 13, 2003 at 09:54

Thursday, Nov 13, 2003 at 09:54
All of the cruisers sold new in Australia until recent times had the 4.1 diffs.
There have been several converted to the 3.7 over the years as this was a ratio available in other countries. It is easy enough to check as has been stated above. The rear end may not necessarily be from a 60 as all cruisers had them from September 75We have so little time to enjoy our land
AnswerID: 37139

Follow Up By: Brendon - Thursday, Nov 13, 2003 at 12:14

Thursday, Nov 13, 2003 at 12:14
Thanks. The 3 speed would explain the difference.
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FollowupID: 26872

Follow Up By: Outnabout David (SA) - Thursday, Nov 13, 2003 at 12:17

Thursday, Nov 13, 2003 at 12:17
the diff ratio has nothing to do with how many gears. 3,4,and 5 speeds were all 4.1 diffsWe have so little time to enjoy our land
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Follow Up By: Brendon - Thursday, Nov 13, 2003 at 12:33

Thursday, Nov 13, 2003 at 12:33
I'm learning. Thanks
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Follow Up By: Tony - Thursday, Nov 13, 2003 at 13:05

Thursday, Nov 13, 2003 at 13:05
If you do a bit more checking you will find the 3.7 in the older 40 series inc the semi floating rear end.
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Follow Up By: Outnabout David (SA) - Thursday, Nov 13, 2003 at 16:26

Thursday, Nov 13, 2003 at 16:26
Tony,
Trust me the only dff to come standard in the 40# in Australia was the 4.1. any 3.7 were put in after irrespective of whether full floating or not.
We have so little time to enjoy our land
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FollowupID: 26904

Follow Up By: Outnabout David (SA) - Thursday, Nov 13, 2003 at 16:26

Thursday, Nov 13, 2003 at 16:26
Tony,
Trust me the only dff to come standard in the 40# in Australia was the 4.1. any 3.7 were put in after irrespective of whether full floating or not.
We have so little time to enjoy our land
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FollowupID: 26905

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