GV-OD, DC-OD & A/T

[Rambling]

Some combined GV & standard A/T with a 4:10 rearend operating information that I noted on my last trip that might be useful to some of you.

1. When towing, until you get up to at least 70mph the rpms are too low to use OD-OD on anything but flat ground and down hill.

2. As has been stated by others, DC-OD works well (lower rpm than GV and DC-OD locked out) on flat ground and slight hills or short steeper hills.

2. Best pulling combination for hilly areas seems to be DC-OD locked out with GV active. RPM is about 2200 at 60mph. This pulls better than DC-OD alone(1900rpm at 60).

3. When using OD-OD and DC- OD lock out is activated, the TC will not go into lockup until the speed drops below about 53 mph. This is a no fun if you're trying to maintain momentum on a really long climb. You'll get a lot of TC slippage(bad thing I know)if you keep your foot in it.

This last item was surprising. It caused more smoke in the cab than an under-boosted-over-fueled diesel on several occasisions #ad
during the last trip. (no comments from the stick community #ad
)

I hope the above makes sense.

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<font color=#990000>~<font color=#990000> '99 2500 SLT <font color=#990000> ~ QC ~ 4X4 ~ LB ~ Auto ~ 4:10 LSD ~
<font color=#000000>*<font color=#990000> BD E-brake<font color=#000000>*<font color=#990000> BD Autolock<font color=#00000>*<font color=#990000> Gear Vendor OD<font color=#000000>*<font color=#990000> Bullhide spray-in Line <font color=#000000>*
<font color=#000000>*<font color=#990000> 2k Komfort 5'er - 9,700 lbs <font color=#000000> *<font color=#990000> Jordan Research 2020 T-brake <font color=#000000>*<font color=#990000> Garmin III+ & Laptop software <font color=#000000>*
<font size=-2>... Keep on Rammin'! You'll love the way it feels!! #ad
... <font size=-1>

[This message has been edited by Rattlin (edited 05-01-2001). ]

 

[Rambling]

J,
Locks up but only under 53 mph. Good idea on contacting GV.

Seems the 3. 54, OD-locked out and GV is good combo. Like the 2200 and 75 mph. Gives you a good range of speed before you the rpm drops too low.



[This message has been edited by Rattlin (edited 05-02-2001). ]

 

[Guest00]

GV od, auto (DTT), 3:54

best towing is GV od in direct ( od locked out). 2200 rpm@75.
Od unlocked, GV off 2200@ 75, od locked up 2000@ 75. IN direct ( unlocked ) + GV od
2400 @ 75. Never had transmission temps over 230 unlocked pullin any grades out here in the frontier( ambients to 110*F ). Have hit 250 backing up though. Thinking of a electric fan for transmission cooling when not moving ( stuck in traffic on interstate in Las Vegas for an hour to go 1/2 mi to exit hit 280 idleing in and out of gear would not cool as no air moving through heat exchangers )or backing.

Have you contacted GV about your lock up no happening when you down shift from od to direct with GV on ??? should lock back up.


[This message has been edited by JNutter (edited 05-02-2001). ]