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Thread: Differences betwen RD28 and TD42 GQ Patrol

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    Differences betwen RD28 and TD42 GQ Patrol

    Hello,

    as my previous project Y60 RD28 was sold, I am about to buy a Y60 TD42 from UN army, that came from Bosnia and Hercegovina. It has the steering wheel on the left side, as all european cars, and it looks quite original, not modified. TD42 are quite rare in Europe, I did not have any opportunity to drive any of those before. There are some things I was wondering about, and most of it can be answered if someone have driven both TD42 and RD28.

    1. How to tell the difference between 2.8/4.2 diffs and gearbox? I mean, ar there any things that are quite easy to see the difference - just to be sure, that there is an original FS5R50A and HG41. How to tell? I've seen alot of cars, that had only the engine swapped to 4.2, and the rest of drivetrain was from 2.8.
    2. Is the 1st gear as short in 4.2 as in 2.8? Seller says, that he actually starts rolling from the 2nd gear, because 1st is soooo short. It is pretty short on 2.8, so I wonder how is it on 4.2?
    3. it is an 1997 so-called "black top" engine, how reliable are they compared to silver tops, how do they tolerate turbo upgrades and so on? I was thinking about a turbo upgrade for that engine.

    Any help will be useful.

    Cheers!

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    Moderator MudRunnerTD's Avatar
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    The Running Gear is identical but the 2.8 dif ratio is 4.6 and the TD42 will be 4.1 or in the later GU lower at 3.9.

    The 4.2 is a great engine in basic trim and responds well to Mods. there are plenty of after market Turbo options and Fuel Pump options for you starting with the GU TD Turbos and Manifolds bolting straight up right through to Big power Turbo upgrades.

    Buy with confdence.
    Its a Nissan! =====> Its a Keeper!! ....... Got a TD42 in it BONUS!! ....... I'm a lucky bugger! I've got 2 of em!
    Check out my Toy --> MudRunnerTD's GQ From the Ground Up

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    Wish it was Nissan though, Toyotas just can't keep up with the Pootrol pace.
    The only good thing about an 80 series is..... the front end?? Wrong!!, the Engine?? Wrong!! the Full Time 4WD system?? Wrong!! Its the NissanPatrol.com.au stubby holder fitted over the transfer lever.
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    Quote Originally Posted by MudRunnerTD View Post
    The Running Gear is identical but the 2.8 dif ratio is 4.6 and the TD42 will be 4.1 or in the later GU lower at 3.9.

    The 4.2 is a great engine in basic trim and responds well to Mods. there are plenty of after market Turbo options and Fuel Pump options for you starting with the GU TD Turbos and Manifolds bolting straight up right through to Big power Turbo upgrades.

    Buy with confdence.
    Thanks mate!

    I will soon get some pictures of her, so I will surely post them. Once a patrol guy, allways a patrol guy. I hope to have this one as the car to live with till the end.

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    MudRunnerTD (4th February 2021)

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    Patrol God mudnut's Avatar
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    The RD28 is basically the same block as an RB30, but is cast with a lot more material to handle the compression and torque.

    http://www.nissanpatrol.com.au/forum...hings-to-check

    The Gearbox is built a lot lighter than the one fitted behind the TD42.

    Assuming the gearbox is basically the same as an RB30. First is quite tall. I was talking to a gearbox builder about swapping to a later Y61 and it seems the gear change mech is slightly different. The RB30 runs a 4.3 diff though.

    The second chart is for a GQ.
    Attached Images Attached Images
    Last edited by mudnut; 4th February 2021 at 01:34 PM.

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    What about the differentials? Are there any differences between the looks of 2.8/4.2 diff, that can be easily checked during inspection?
    As for the gearbox, it is pretty obvious and easy to see the difference :-)

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    Patrol God mudnut's Avatar
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    I have a GU 4.3 diff centre in my GQ so I assume the housings must be the same. You might have to mark a tyre and the drive shaft with chalk. With the a jack under the diff, rotate the tyre and count how many times the shaft rotates or vice versa. Other than that , count how many nuts there are around the diff centre and compare them.

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    The driving differences are quite marked in the gearing.

    4.2 has all the torque lower down in the revs; at 2.5 you're just about revved out for power.
    2.8 turbo is the opposite, you don't get much power until the turbo kicks in, like about 1.8 -2K revs and above to 3 and over.

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    Danyael (3rd April 2021)

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    Thanks for all the answers, I bought that car!
    It still is in Poland and I will need to wait until sommer to drive it home to Norway (because COVID), but I am happy already. I will make a new thread as soon as I'll have it at my place.

    https://photos.app.goo.gl/4GozBX388LAdSNDZ7

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    Congratulations Dan Mate!
    A Beautiful looking GQ Silver Brumby there Bloke


    Sent from my iPhone using Tapatalk

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    Cool wheels and tires. I was assuming it was white, since you mentioned the car to be ex-UN.

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