84' FJ60 - How to tell lift size

[mmyton]

I am trying to determine specs for replacements shocks for my 84' 60. The PO installed a lift. Is there a simple way to tell how big the lift is? I believe it is a shackle lift (leaf springs).

There are currenlty ProComp ES3000's on the front and rear. Part numbers 32650 (Rear), 32051 (Front). I checked the spreadsheet in the tech section, but it only lists the specs for the rear shocks (32650). Tried searching the web for specs on the fronts with no luck.

Thanks for any help.

 

[DocB]

Each rig is different. The best thing to do is to pull the shocks and do some measuring.
Use a high lift to jack up each corner until the diagonally opposite corner is compressed to the bumpstop. Measure the fully drooped corner, shock mount to shock mount. Measure the fully compressed (diagonally opposite) corner, shock mount to shock mount. Jack each corner WAY up to measure full compression and full droop on each corner. F and R will be different. I think Man a Fre and JT Outfitters have charts for some shock brands. With the exact measurments, though, you should be able to find any shock and buy the one in that length range. This is how I did it.

 

[jwest]

Doc's method for using fully compressed and extended travel is right.

But, if you're within about 2.5" of oem ride height, a good aftermarket shock manufacturers oem application should be fine. You didn't mention having lifted springs.
An extended shackle will give you half it's increase in length from oem. So for example, if the difference between the oem shackle length and that of your lifted shackle were +2", your ride height increase would only be 1".

 

[jwest]

Ah, oem shacles are 3" center to center, iirc.

 

[mmyton]

Thanks. Not really sure what size the lift is, can only tell that a shackle lift has been added. I checked the specs for the rear shocks that are on it (ProComp ES3000) and according to the spreadsheet here in the tech area, the extended length is 27.1", compressed is 11". I couldn't find my front shock listed. Is there a way to use the rear shock specs to determine the front?

Wish I had a high lift to try Doc's method.

Thanks

 

[lowtideride]

find a loading ramp (fake rti) and ramp it.....same as the high lift method...do it til ya hit bump stops.

 

[Landpimp]

how much clearence between the front axle and bump stop? most old stock suspensions don't have much more than an inch or so.