Milemarker Select Drive

[bd450]

Hey gang,

Anyone out there ever try one of the Milemarker Select Drive viscous couple gizmos?

I am thinking about one for snow & ice & mud & dry on pavement and dirt roads. I run into a lot of mixed conditions here in CO. The wifes Jeep GC has full time 4wd with viscous coupler and it works pretty good.

My ext. cab long bed CTD is way too big for any serious off roading (got an 85 4runner for that) so rock crawling isn't an issue.

With all that cummins weight up front and mega torque going to the rears only it would be nice to be able to use 4wd more often.

Thanks,
Brian

 

[Loren]

I have a Select Drive installed on my Y2K Quad-Cab. I like it even more than I thought I would. I was afraid that it would slip too much and not provide very good 4WD, but that was unfounded. In 4WD, the truck will leave black marks on dry pavement, indicating good traction at front and rear.

I installed my Select Drive with the hope that it would act as a drivetrain "fuse", enabling me to use 4WD without fear of breaking anything. It seems to do that job perfectly.

The MileMarker people told me that it is not meant for serious off-road four-wheeling.

For what it's worth, prior to installing the Select Drive, I would use 4WD in rain, snow, or any other time I thought that it was a bit slippery. I never had any trouble with that usage, but it's nice to know I'm less likely to break something now.

I recently sent Robert an article on my installation. Maybe he'll publish it.

Loren

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2000 Quad Cab, 4x4, short bed, six-speed: U. S. Gear exhaust brake, MileMarker Select Drive viscous coupling, Velvet-Ride spring shackles, Painless Wiring circuit box, Optima yellow-top batteries, Super-Glide 5th wheel hitch, Reese folding ball gooseneck hitch, Drawtite front hitch receiver, Tekonsha Sentinel brake controller, Westin nerf bars, Clarion sound system
1995 Standard Cab, 4x4, long bed, automatic: Firestone Ride-Rite air springs, torque converter lock-up switch, 4" cat-back exhaust, Reese 20K 5th wheel hitch, Reese gooseneck hitch, Hayes Micro Control trailer brake controller, 100 gallon bed-mounted fuel tank with 12 volt electric pump & fill nozzle, Swiss Cap fiberglass cap

 

[Cooker]

Sorry for the ignorance, but what exactly does this do? Is it like the full time 4wd on the Jeeps?

 

[rich m]

Originally posted by Cooker:
Sorry for the ignorance, but what exactly does this do? Is it like the full time 4wd on the Jeeps?

seen it advertised in Jeep magazines: For "mental picture" purposes, imagine a cylindrical (flattish like a tuna can) clutch plate-bolted between the front output of the T-case and the front-drive shaft. Now, imagine that this object is a two-piece affair (inner and outer, or front/back) with the two pieces NOT in solid contact. Between their surfaces is a superviscous fluid ( viscosity in excess of 40-50K, as I recall) that allows enough slippage to prevent torque bind, while still transferring lotsa
torque to the front end... .
maybe they've got a better ad on their website www.milemarker.com ---happy clattering... rm