3.9 auto box in a diesel?

Tom Sleigh · Nov 26, 2018

Hi,

Hopefully a quick question. Can you put a gearbox from a 3.9 petrol into a 300tdi. Specifically 4HP22 (non electronic).

Or is something different due to operating revs/rpm?

Thank you.

jamesmartin · Nov 26, 2018

Tom Sleigh said:
Hi,

Hopefully a quick question. Can you put a gearbox from a 3.9 petrol into a 300tdi. Specifically 4HP22 (non electronic).

Or is something different due to operating revs/rpm?

Thank you.

apart from bell housing which can be swapped youd need to swap the valve block as whilst it would work the gearing would be terrible ie changing up before the engine could manage

Tom Sleigh · Nov 26, 2018

jamesmartin said:
apart from bell housing which can be swapped youd need to swap the valve block as whilst it would work the gearing would be terrible ie changing up before the engine could manage

Thanks for the reply! That's really interesting! Didn't realise that's where the diesel and petrol 4HP22. I take it that the torque converter is the same?

jamesmartin · Nov 26, 2018

Tom Sleigh said:
Thanks for the reply! That's really interesting! Didn't realise that's where the diesel and petrol 4HP22. I take it that the torque converter is the same?

t/c differs too iirc,apart from those they are identical boxes

Tom Sleigh · Nov 26, 2018

jamesmartin said:
t/c differs too iirc,apart from those they are identical boxes

Thanks, I had a conversion done but the gearbox was of unknown origin. It came with the medium sized torqie converter. Everything fitted fine. Medium torque converter makes me think 3.9 or larger petrol?

You have to rev the pants off of it to get it to go up a gear. Will do the first 3 at a struggle but the 4th never happens.

Thanks for your help. I will see if I can find a 300tdi 4hp22 valve block.

Tom Sleigh · Nov 26, 2018

1 other thing. Is the lt230 transfer box different for petrol and diesel? Just thinking of how it turns down the engine RPM to road speed.

Not sure how different a petrol and diesel RPM is at cruising speed?

3.9 auto box in a diesel?

Tom Sleigh

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Tom Sleigh

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Tom Sleigh

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