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Discussion Starter #1
I really like my automatic Spider but it does cry out for a 4th, overdrive ratio, gear on major roads.

Has anybody done a conversion from the zf 3hp22 box to, say, the zf 4hp22 box?

Any ideas on what would be needed?

I'm guessing at;
- bellhousing change
- propshaft length change
- gearbox mount position change (I think, but not sure, the 4hp is longer than the 3hp)
- interior trim change.
 
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