I'm going to monitor drive shaft RPM using the MSD Grid. Trouble is I don't appear to have any room to fit an 8 magnet collar on the pinion. I'm running a Dana 60 and there appears to be a metal dust plate there, and anyway, it's way to thin @ .200".
Has any used the slip yoke instead? I know it's gonna move but how far?
TIA up

'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03