In my quest for comfort in the 10 years since our 2014 4/4 was new, I have done the following:
1) 2016 - Replaced OE shock-absorbers with AVO adjustables supplied by John Worrall, Heart of England Morgans. The OE items had worked OK when new but wore out very quickly - especially on the front.
2) 2017 - changed the weak OE rear springs and used MulFab 4-seater, 4 leaf springs - made a big difference but did not eliminate the crashing at full deflection
3) 2021 - Fitted Roger’s Spring Assisters - and finally eliminated the crashing at the rear
4) 2024 - Fitted SSL front suspension kit (together with 4 x SPAX adjustable shock absorbers - the rear AVO’s in particular were well past their best). This seems to have eliminated the crashing bottoming out at the front whilst retaining the compliance.
Shortened rebound springs would not have helped on my car as there has always been a free clearance between the rebound springs and the stub axles.
I believe that my era of 4/4 was fitted with front springs that were too light for the task but don’t have anything to substantiate this. I aware of at least one 4/4 of a similar vintage that has been fitted with slightly heavier duty front springs with good results.
