Ok so ill put up this info incase anyone else wants to go down this path, i know 3 others have done it but never put up any indepth info and have all left the site now.
I managed to get a pair of ultimas for a 60series landcruiser/ mk triton for about half the price of a 1 decent brand shock as a trial set in case i break something in my messing around. So far ive gained 60mm down travel and still have about 40mm left of shock down travel but am now either limited by my leafs or driveshaft so have 25mm spacer on its way for driveshaft and if that doesnt do anything ill muck around with my leaves.
Ultimas advertised measurements vs what they actually are-
Closed length 375mm - 393mm
Open length 630mm - 640mm
Ultimate Suspensions long travel shocks that don't need a bumpstop extension are around 378mm closed and their ultra long travels are 390mm closed so im guessing 378mm is about the limit before you have to extend the bumpstop. I cant confirm exact figures coz i cant max out my up travel no matter how bad ive tried haha, so next step ill drop a leaf pack out and measure it but i think ill end up with a 20mm extension just to be safe.
As a side note, Ultimas (ebay cheapies) are way softer and nicer on road and off versus the dobinsons, and if they last more than 30k km they'll be a far superior shock
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