Gearbox upgrade

wammers said:

You would have to ask why, if that is so, Land rover used the HP22 on H/C 4.0 litre petrol engines giving 320 Nm of torque as standard and with 20 or so more BHP than you would get by chipping a diesel. From 99 the 4.0 litre had it's BHP reduced from 187 BHP to 177 BHP. Maybe the torque went down also, but that is more likely to be due to emission fitments than any other reason. I don't have torque values for that derivative. But it is an interesting scenario. Why did they produce thousands of vehicles fitted with a gearbox that they knew would not cope? But i still maintain that driven normally a chipped diesel, if the box has been serviced properly, would be ok. Towing would maybe give problems if you chipped one with a tired box that had been neglected, that point is pretty obvious.

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Datatek said:

From what I found when I investigated, the box survives because of the torque reduction request on shifts, a power box negates this function to a large extent., chipping it would I imagine do much the same.
LR under specify eveything, including track rod ends, UJ's and diffs, no reason why the box would be any different.
I'm still going to fit an HP24 to mine in due course.

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JotaPê;2592032 said:

Didn't they do the samething withe L322 3.0Td6? I believe that the GM gearbox also has a torque limit lower than the torque produced by the engine.

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