Hzj79 gearbox

[Koens90]

Hi there, I still have my 2002 hzj79. It has 560000 km's on it but runs fine. It still has the original gearbox but it starts making noise a bit. I regularly tow trailers, and with the 1HZ that needs some patience as you probably know ... I don't need a high top speed since driving trailers has a restriction to 80 km/h in the Netherlands. So lower gears are better.
There is a H55 for sale nearby from a HZJ75. Is that a good choice, and is it a direct bolt on to a 79? I know the problems of 5th gears but I can barely use 5th gear with trailers anyway. And I know allot of contractors around here that did >500 000 km's with 75's and old troopy's around here in combination with trailers.

 

[AirheadNut]

It won't be a direct swap, you'll have the R151f transmission so putting in an H55f will require a bunch of changes. If you're planning on putting in the work to swap a transmission you're probably better off going with an H151f or H150f. Lots of details on the conversion here: Pulled the trigger on a H150 box for my HzJ76 - https://forum.ih8mud.com/threads/pulled-the-trigger-on-a-h150-box-for-my-hzj76.1100214/

 

[Gun Runner 5]

Is a new (or newer) R151F not available? 560,000 KM’s is quite impressive.

 

[Koens90]

Is a new (or newer) R151F not available? 560,000 KM’s is quite impressive.

That might be a better option if the h55f isn't a direct swap. Found a used r151f from a guy that changed it for a 1HD and h151 in his 78 troopy. He says it runned 110k km's so hopefully I can reach the million km's with it

Would it be best to change seals etc before installing? My experience is that stuff that's put together by Toyota lasts longer than reparations you did yourself...