hj75 rear axle in into fj45 troopie

Submitted: Saturday, Feb 09, 2008 at 19:34
ThreadID: 54407 Views:4758 Replies:2 FollowUps:1
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hi folks, can anyone tell me if a hj 75 complete rear axle will bolt up to a fj45 troopie, also will a 5 speed from the same fit, cheers
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Reply By: Peter 2 - Saturday, Feb 09, 2008 at 19:52

Saturday, Feb 09, 2008 at 19:52
It will but there are a few hurdles to overcome, same goes for the 5 speed.
This is from memory but it has been many years since I did the same/similar conversion and the brain is a bit foggy.
Check that the spring seats on the two housings are the same width apart, I 'think' the 45 is narrower which means you will have to relocate the spring seats on the housing.
I did a disc brake conversion to the front at the same time which required the master cylinder to be changed (used a 60 series one)
Is the 40 series actually a diesel? if so it is technically a 47 in which case the gearbox/bellhousing will bolt straight in as the engines are the same. If the 40 is actually a 45 with petrol engine then I 'think tht bellhousings are different.
You need the gearbox and transfer as a complete setup from the 75 as the transfer on a 45/47 is different and won't bolt up.
Of course once you fit the 5 speed and later transfer case you then need the 75 rear end to get a handbrake as on the 45/47 it was on the transfer and on the 75 it uses the rear brakes.
I can't remember what I did about tailshafts but think I had to get the 47 ones lengthened and shortened as the transfer ends up a bit further back.
Transmission mounts are very different on the two and required some mods from memory.
any more questions fire away as the memory might have an answer ;-))
Peter
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Follow Up By: Member - Shane D (QLD) - Saturday, Feb 09, 2008 at 23:45

Saturday, Feb 09, 2008 at 23:45
No out to discredit you Peter, but, the earlier diesels where called HJ45(75-80) then came out with the 2H motor, These where then called HJ47 (80-84).
The only difference between FJ40 and a FJ 45 was wheel base, the utes and toopies had the same.
I think the chassis are further apart in 7# compared to 4# and engineering may be required for the axle's to work.
Shane
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Reply By: Member - DOZER- Sunday, Feb 10, 2008 at 07:26

Sunday, Feb 10, 2008 at 07:26
The diff widths are thesame 75 to 45, the spring pads sound like they will need moving.
The 5 speed will be able to fit, using your bellhousing on it.
Andrew
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