Found electric two speed speedo adapter that goes with a two speed rear axle last weekend at the Tri State Swap Meet in Denver for ‘55 to ‘59 GM product, unlike the mechanical one we saw a few weeks ago. Going to put it on my GMC 630 I put a two speed axle in. Haven’t tested it out yet. It appears it could fit on any speedo,just bolts on existing threads.
Ed
Last edited by EdPruss; 02/13/20237:17 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
