1st Gear Too High

[the evil twin]

If a TD42 is hard to get off the line don't ever try it in a ZD30.

I'd try and get a decent tuner to give it the once over as suggested

[happygu]

If a TD42 is hard to get off the line don't ever try it in a ZD30.

I'd try and get a decent tuner to give it the once over as suggested

Depending on the the load and temperature, the 4.2 can bog down and be hard to get off the line - just like the 3 Litre. I know as there were a few times in tricky spots I thought the 4.2 would never get moving, and I had to feather the clutch to try and get some flywheel momentum....

[BarnesBuilt]

Sorry for not getting back to everyone a little earlier and thank you all for responding to my query.
I have considered changing the diiff centers but am concerned about losing the top end as once the vehicle is under way it tows quite well as I had it put on a dyno to advance the timing and that alone did make a difference in overall performance but still have this problem taking off on a gradient under load.
Would be interested in hearing more about Robo's truck with the DC3 injection pump conversion and costings. Why does this pump offer greater power and approx costings?
Thanks again to everyone for their replies.

P.S. Wheels are the original 17" with BFG All-terrains that were the closest match in size to the original Bridgestones.

[MudRunnerTD]

changing the diff ratios won't have much top end loss mate, not the top end you are using anyway. It will increase your revs through out the gears and maybe add 200rpm at cruising why speed. This will mean that instead of sitting at 2100 rpm at 100km or so (just on boost) (The TD42T hates it here) you will be cruising down the road at maybe 2300rpm with solid boost.

The torque off the mark will be increased and the hill climbing will be well improved. I rate this upgrade for your money.

The type of upgrades that Robo has described start and $5000 but much closer to $10,000. It will be a Beast but it costs money.

[BarnesBuilt]

Thanks Mud Runner, you have obviously done your homework on this matter and will give this option some real consideration, do you have any idea of costings to change diff centers?
Stephen

[MudRunnerTD]

If you can find some second hand centres which should be fairly easy then you will probably be a Drive in Drive out fitting you might spend less than $1500. You could spend much less than that even to be honest. $1500 should be worst case.

[mudski]

If you can find some second hand centres which should be fairly easy then you will probably be a Drive in Drive out fitting you might spend less than $1500. You could spend much less than that even to be honest. $1500 should be worst case.

Yeah i paid $650 for two centres at 4.11 and then it was $800 i think for the fitment. I could have done this myself, as i have before, but laziness got the better of me back then.
So to the op, many would recommend 4.3 ratio. I had this and like i said, 1st was almost non existant. With 4.11s i can still take off quick in first im sitting on 2450rpm at 100clicks, give or take. Its right in the rev range so if i need to over take power is on tap straight away.
4.3s are dearer to buy too as everyone seems to prefer this ratio. Or even 4.6s. I love the 4.11s.

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[BarnesBuilt]

OK, MudRunner TD and Mudski have put up pretty convincing advice to change the diff ratios to 4.11, what part of the differential requires changing, is it the pinon and crown wheel?
Stephen

[MudRunnerTD]

OK, MudRunner TD and Mudski have put up pretty convincing advice to change the diff ratios to 4.11, what part of the differential requires changing, is it the pinon and crown wheel?
Stephen

Yes but just chase up a pair of complete centres, they will bolt straight in. Make sure you don't buy a H260 rear though as its too big for you and some Gus ran them.