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40 series question

General Tech Talk

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Posts: 278
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40 series question

Post by china »

askn those that know if bj42 & fj40 diff ratios are the same or any other info can a 42 rear diff fit a 40 nfront cheers.
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Post by Bartso »

bj40 and fj40 have different diff ratio's as the bj is a deisel and fj are petrols a 42 series diff from what i remember will fit but check ratio's first
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Post by J Top »

There's only 2 ratio's that I have come accross,3.9 and 4.1.
The 3.9 are early and rare now.They are also coarse spline ,as are the early 4.1 ,so they are weaker.
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40s

Post by china »

ok then does this help petrol is 82 desiel is 83/4 cheers
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Post by J Top »

I should clarify,the pinion has the coarse spline,they all fit,the early L/C s
had a smaller driveshaft flange ie pre 74.
Just check the ratio's.
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40

Post by china »

maybe i should go n buy the other diff that matches or just put old centa in new house
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Post by GeneralFubashi »

i have a feeling that all mid-late 4x series imported to aus have 4.11:1 ratio including fj and bj models. 55 and 60 models got the same ratios too. Later model fj series imported to canada and the states and other places got 3.70:1 from the mid-late 70s onwards.

The axle designation on the id plates on the firewall should get you the info, if you just make sure that the numbers match b4 you swap them out.

cheers
Sam
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Post by china »

thanx mite just use old centa in new house 2 b safe
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