Driveshaft slip rings

[Daniel R Burk]

Tom:  Actually, a company introduced such a system this year at the 1996 
SAE congress for street use.  They called it an on-car dyno.  I have a 
slip ring very similar to it that did something like 30,000 miles on 
Milford Proving grounds testing.  It is mounted on a modified output 
shaft from the transmission.  The very same torque passes through the 
output shaft as the driveshaft and you can mount the stationary part of 
the slip ring on the transmission.  

MSC slip rings have gone 100,000 miles on test cars with virtually no 
wear.  You are right however on the fact that these devices are for 
testing only.  Most of us could not justify the $1500 - 3500.00 cost of 
the slip ring.