Re[2]: ABS 'bugs'

["Dahl, Dave" <dad@roadnet.ups.com>]

>>  Eliot,
>>  Into which category would you put something like a 1975 K5 Blazer with 
>>  the full-time 4WD?
>>  It's a 350 V8, 350 Turbo-hydramatic, the transfer case has low-locked, 
>>  low, neutral, high and
>>  high locked and has no locking hubs? Does this puppy have a center diff 
>>  or some kind of VC?
     
>sounds like it does have a center diff with manual locking a la 
>the first generation quattros.  the clue is the "low-locked" and 
>"high locked" settings.  "neutral" sounds like front drive 
>disengaged. this is probably a hybrid full time/part time system.
     
Yes, the transfer case does incorporate a center differential.  However,  
"neutral" on the transfer case means neither end is driven; even the part-time 
4WD transfer cases have a neutral position.  My best guess on the reason for 
this is to run a PTO from the transfer case with the vehicle stationary, such as
for a wrecker or dump truck.  Granted, a Blazer isn't used for either of these, 
but it shares its drivetrain with all the GM light-duty (and some medium-duty) 
trucks.

Probably the biggest difference between this drivetrain and the original Quattro
is this:  In the Quattro, you didn't have to plant both feet on the dash and 
yank on a short lever to get the *&%$ thing out of low range!  :)

- Dave Dahl  (dad@roadnet.ups.com)
- '87 VW Quantum Syncro
- '93 Volvo 850 GLT