It is an eaton 2 speed rear with the low ratios and dash sticker for help! I believe its 9.17-7.17.
I believe you have 7.17/9.77:1 gears.
Where could I find a replacement gasket for under the light on top? Its splitting pretty bad and i dont want water getting in the roof.
I got my gaskets from Dcaptian...http://www.dcaptain.com/beaconray_gasket_kit.htm
What kinds of radios could this truck have had? There are holes in the dash from one(or more) as well as stickers about radio use.
Ask the fire company what radio they used.
Is there a surefire and easy way to tell if i have the gm or spicer trans? I thought it was a spicer. Im working on getting a parking brake from an old international that looks like it will fit.
The standard issue trans for Spartan 100's was the New Process 540 (NP-540)...it's shift pattern was 1st is left and up, 2, 3, 4 & 5 as an H in the middle and R is to the right and up.
I'm betting that's the original transmission in your truck and believe it's the optional Spicer, either model 3152 (standard ratio) or model 3152A (close ratio). Their shift pattern is just like your gear shift knob shows with R and 1st to the left.