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Ok, it looks like I need to replace the Monro Gas-Magnum 60 shocks I installed on the front of my M when I built it. I went with the Gas-Magnum 60's 66707 as I had a larger spring pack, and they worked great on the trail and RTI Ramp trials, that is until last weekend when I pulled up on a 25 degree ramp and scored a 98. It seems that the extended shock just could not take anymore, and puked oil.

So I could install some limiting straps, but would also like to get a little more shock stroke. The chart below list my (as I see them) options. The top shock (66707) is what I have now.



As my shock with the truck setting on the tires is at 19", and I have 2.5" between the bump stop pads and the frame, I could get down to a 16.5" (or slightly longer as the shock is on an angle), but believe I need a little more short travel to accommodate the axle tilt on a RTI, so I'm thinking a shock that is fully compressed at 16.375".

I like the 3rd from the bottom shock, the 66891. I should gain a good 0.875" of extra downward travel. However the shock is a little smaller in diameter.

Your thoughts?

Smaller diameter means less working fluid in the shock. For slow speed wheeling this usually isn't a problem. At higher speeds on rough roads, you might experience shock "fade" out a little sooner. For the truck its on though, I wouldn't be too worried about it...

I am running Monroe Gas magnum 60 part number 66957
so far i am happy with them.
I had too search and search so much to finally pick this model, consulting with stock standard and doing my own
research, no help available this end, as noone knows what an M37 even is.
I wrote in my notes normal ride height, compressed height,extended height, compression forces,
Hell i even learnt the mounts are known as L4 ( go Figure) learnt things called "Bore sizes".

Don't ya just love restoring old trucks--- not

Installed the new longer shocks today. HEre you can see the difference in lengths. The new shock is a Monro Gas-Magnum 60 #66891 (16.375/26.75) while the old one was a Monro Gas-Magnum 60 #66707 (16.0/25.5). The new shock is 3/8" longer when compressed and 1.25" longer when extended.