Achei isso em um forum gringo:

So I had some time the other night and pulled the wheels to see if my idea will work. I had found that struts for the rear of a Chev sedan - Monroe part # 801831. Charts showed that it has 1.5" more travel than a stock strut. I removed the strut and compared the travel of the two struts. When the struts are extended they are the same length. When compressing the struts the stock one stops at the extension and the new one goes down 1.5" more. So if I installed the new struts and didn't change anything else I would only gain more up travel and no more down travel. The only problem is the coil spring won't compress much more past where it does now before it hits the bump stop.

Fica uma folga na fixação dele, mas dá para resolver, e ganha 1,5" de curso na dianteira.

IFS long travel - it can be done

Só falta descobrir de que carro é.
Abraços.