View Full Version : pull driveshaft for 4000+ mile trip?
07-22-2010, 09:08 AM
If you read my "strange noise" thread, you see that Amber is taking the girls to the east coast for a few weeks, and is road tripping out there in her 80. My question is do you think it is worth it to pull the front drive shaft for the trip? I know some MUD experts say it makes no difference, but it would seem to me that even a 2 mpg improvement would make a significant difference over 4000+ miles. (hmm...quick estimate is just a few tankfuls, under $200). I know the resident expert who does the major work on our 80's does take his driveshaft off to go to Moab, but Robbie's truck is definitely setup differently than her stock 80. What say you?
would it make any difference without locking hubs? Everything will still be spinning.
07-22-2010, 09:43 AM
hmm...no ABS? I can't remember....
No ABS with the Center Diff locked.
07-22-2010, 10:04 AM
I'm not sure I'd mess with the drive shaft. I'd be a little surprised if you got a solid 2 mpg gain anyway.
Probably driving 70 or 72, rather than 78-9 mph, would give you a nice payback in the MPG department, on this or any other vehicle. I realize that with 4000 miles to go, you generally want to go faster, not slower.
07-22-2010, 10:18 AM
I would leave it on. I personally don't like how it handles with just RWD, and if she had to do any kind of evasive maneuver, or ran into any serious rain, she'd be psyched to still have AWD, well worth the $200, IMO.
07-22-2010, 10:27 AM
jack up all 4 corners of the truck and have her drive 5-15 mph were the noise is herd and crawl under the car and listen for the noise befor pulling off parts of the truck that are most likely not even close to the noise. !!!! its like a blind man trying to hit the side of a barn from 200 yards away. first rule of a mechanic
duplicate the consirn !!!! you cant fix it if you dont know were its comming from !! your just throwing parts and labor and time at the truck and NOT fixing it..
I wouldn't have any concern pulling the front shaft for such a long drive. People have driven rear wheel drive cars in the summer on long road trips for years. This will be no different. My guess is that it will save you a bit of gasoline, since you won't be sending power to turn all 4 wheels. You may also find it a bit more pleasant to drive with fewer vibrations. I say pull the front driveshaft, drive it on the hwy around here, and see what you think.
07-22-2010, 10:54 AM
thanks all...I did drive my 80 for a couple of weeks last year with no front driveshaft while it was getting rebuilt. did not notice much difference, even ran Slaughterhouse Gulch in one wheel drive. :)
07-22-2010, 11:48 AM
I would pull it. The crude early-generation ABS could get some into trouble, anyway.
AWD rigs gain nothing by pulling the driveshaft. Personally, I think all it does is lighten up the steering.
I have to tell you that about the last thing I would do in sending :Princess: on a 4K roadtrip is pull part of the driveline where it is not available if for some reason she needs it.
There is nothing you can do to gain 2 mpg on an 80 that does not have a current service issue. If pulling the driveshaft saved 10 gallons of gas on that entire trip I would be surprised.
Take the driveshaft to a good drlveline shop and get it fixed. If it isn't the driveshaft, leave it alone.
07-25-2010, 02:49 PM
Gonna have to side with the boys at the Ih8mush on this one,
I would leave the drive line in,
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