P38A zfhp24 swap into 2.5

My old 2.5 autobox gave up and I've just swapped it with a hp44 065 box which I was told was a straight swap, when I tried to drive it, it made clunking noises and would only move slightly when manually selecting 1st gear.
On top of this I got a stall speed error fault

The diesel bell housing and torque converter have been swapped onto the 065 box so it is a bolt on job.

Anyone have any insight into this?

There is a risk the oil pump could not have been engaged properly?? Never done this one. Unless the replacement was faulty before hand...

Mark Piercy said:

There us a risk the oil pump could not have been engaged properly?? Never done this one. Unless the replacement was faulty before hand...

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+1. Really easy to tighten up and snap the lugs. @jamesmartin can explain it best.

I'm thinking the replacement box I've got is knackered, another 500 quid down the drain. Thought putting the hp24 would strengthen the reliability

BigAd said:

I'm thinking the replacement box I've got is knackered, another 500 quid down the drain. Thought putting the hp24 would strengthen the reliability

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Doesn't strengthen reliability, Mines been on its original hp22 sine 1999 and 220.000 miles... It's an upgrade you may never see the real benefit of unless you tow in a professional capacity. The hp24 was used in the almighty torque monster V8 and needed to stop the beast tearing butt holes in the hp22.