hdj79 gearbox into hzj75 ute

Submitted: Thursday, Jun 02, 2005 at 04:02
ThreadID: 23519 Views:10098 Replies:3 FollowUps:7
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will hdj79 gearbox bolt up to hzj75 ute does clutch flywheel ect have to be changed can digital speedo drive be changed to suit 75 series has anyone out there done this conversion would appreciate any advice. THANKS
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Reply By: bundyman - Thursday, Jun 02, 2005 at 15:22

Thursday, Jun 02, 2005 at 15:22

The 79 Series gearboxes are no where near as strong and reliable as the 75 series box. So unless you have a good reason I personally wouldn't swap them. We have constant problems with the new underground cruisers and the gearboxes. Other people can correct me if I'm wrong but they now use the hilux box in the 79 series cruisers. They should have but the cruiser box in the hilux. Good luck.

AnswerID: 114097

Follow Up By: polar - Thursday, Jun 02, 2005 at 16:38

Thursday, Jun 02, 2005 at 16:38
Your right the R150 wich is the standard 79 series box is a boat anchor but the box I want to fit is the H151f out of a 2003 turbo diesel cruiser ute from what i am thinking i can us a 275mm coase spline clutch plate from 4.5 cruiser petrol motor as mine is a 1hz naturally asperiated wont need the big clutch as motor doesnt have the torQue to warrant it so I wont have to change the flywheel . just move the gearbox mounts back do redo front and back drivelines to correct length. has anyone out there done this as the exact distance to move the gearbox mounts back and correct tailshaft lengths would save we a lot of time cheers. POLAR
FollowupID: 370091

Follow Up By: Member - Phil G (SA) - Thursday, Jun 02, 2005 at 16:59

Thursday, Jun 02, 2005 at 16:59
Hi Hughsy,

Yes and No.

The box you're referring to is the R151F (same as Prado) which comes with the 1Hz normally aspirated diesel 79series. They had problems with a shaft breaking between gearbox and transfer.

The factory TD and 4.5 litre petrol 79series have the H150F which is a much stronger box - similar box to late 80series.

I agree with you though - I'd be sticking to the earlier box.

FollowupID: 370095

Follow Up By: Member - Davoe (Widgiemooltha) - Thursday, Jun 02, 2005 at 22:03

Thursday, Jun 02, 2005 at 22:03
Biggest problem I have found with the 79 series is not so much that they have specific weak points but there seem to be more lemons amongst them. Some go great with no problems while others are slugs with never ending problems. Still yet to see a drivetrain failure not even a front diff Although the work utes at one of the sites has more wine than out the front of the trilby cooper hostell
FollowupID: 370128

Follow Up By: bundyman - Friday, Jun 03, 2005 at 09:36

Friday, Jun 03, 2005 at 09:36

We've probably replaced 3 gearboxes in the last 6 months (and only have a relatively small fleet). Starts with the synchos and then...... Yes they are the only 2 gears that get used virtually but we never used to have these problems with the old 75 series even after 50K of underground thrashing. Motors still sweet as. We have a graveyard full of U/S cruisers(read - rusted away to nothing) that have donks that still run like a dream. Just wish I could get one home.....

FollowupID: 370178

Follow Up By: Member - Davoe (Widgiemooltha) - Friday, Jun 03, 2005 at 21:09

Friday, Jun 03, 2005 at 21:09
Where do you work ? I am currenty working for Mincor (west Aus u/g Nickel mines) but have worked in mining and Exploration for about 8yrs. I really believe with all this talk about what is better than what you really need to have used these vehicles(as you know) in a work Environment to really understand what they will take. such as a bulldozer for weeks on end in dense bush or putting 2 tonnes of samples in the back and flogging them over an ultra rough pit floor or holding them absalutly flat for 200m in reverse up a decline to the next stockpile to get out of the way of an angry truckie. Interesting I have heard about the front diffs and gearboxes going but havnt personally seen it - yet. Although the first 79 on site at KCGM lasted one week and the clutch let go
FollowupID: 370255

Follow Up By: bundyman - Monday, Jun 06, 2005 at 13:14

Monday, Jun 06, 2005 at 13:14

I'm currently living/working in Cobar NSW but have worked in mines all around Oz. Mainly Gold mines with the exception of a few. Send me an email mate cause I have probably either run into ya or know someone that you know - mining is a small industry!! I work for an WA based underground contractor.


FollowupID: 370443

Reply By: Member - Phil G (SA) - Thursday, Jun 02, 2005 at 17:05

Thursday, Jun 02, 2005 at 17:05

The transfer cases are different. I don't know why. But the transfer levers are different with the factory TD having an in line transfer selection.

I don't think your transfer case will mate to a H150F box out of the 79series TD, but I may be wrong.

I reckon you could get your old box reconditioned twice over for the cost of a H150F.

AnswerID: 114105

Follow Up By: polar - Friday, Jun 03, 2005 at 01:39

Friday, Jun 03, 2005 at 01:39
i have the complete gearbox and transfer (h151f) out of 79 series turbo diesel ute. If you look at the transfer on the non turbo 1hz 79 series you will see it is the troublesome 75 series tranfer grafted on to lightweight box. these boxes have been a bonanza for wreckers and gearbox rebuilders(who thought toyota could make something worse than the 75 series box)I know toyota updated the shaft in them late 2003.but as a work truck carrying weight and towing heavy loads they will continue to die in droves. POLAR
FollowupID: 370140

Reply By: Member - DOZER- Thursday, Jun 02, 2005 at 22:46

Thursday, Jun 02, 2005 at 22:46
the h series box uses a different transfer to the r series used in the prado and 1hz cruisers 7# and 105 series now.
The h150 from the t/d will require a special clutch as you cant go 12 inch on the 1hz flywheel, you will have to use the 1hz diameter clutch with the right spline in the middle....if you could find a fzj75 wrecking, the running gear would all bolt in as they use h151...
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