Gas milage increase!

[nfpgasmask]

Well, I changed my fuel filter, and switched to a regular K&N box filter, and I noticed an increase in gas mileage. I also change my oil and PCV every 3000 and have been doing so for a long time. Keeping things clean definitely helps. I don't know about the tranny juice, but it may also increase efficiency, which may in turn help the VX use less power to shift, etc, which may have helped, but now I am talking out of my @$$.

I am about 10k miles away from doing my tranny fluid/filter and diffs again.

Bart

Hey folks -

This may seem obvious to some but I just wanted to point out that I have been seeing better gas mileage from my VX after performing the following maintenance:

• Flushed and filled tranny fluid
• Changed out the PCV valve
• Flushed and filled front and rear diff fluid

I was previously getting about 270 miles before the light came on. Yesterday I managed to get 330. When I filled up at the gas station, I put in about 20.xx gallons (cost me friggin $65.46!!!). My driving style has not changed, so I can only guess this basic maintenance helped me to achieve the better mileage

Anyone have opinions on this?

Current power mods:

PV 1 exhaust
Basic cone air filter

[Dino]

That little PCV does a lot to increase mileage. That valve lets unburned fuel vapors, which are prsent in the crankcase, into the intake where it can be drawn into the cumbustion chamber and burned. The tranny juice helps too. Less slip and better grip in the clutch packs.

[JHarris1385]

I have NEVER changed my transmission and diff fluids before. I need to do this and dont want to pay a shop. how difficult is it and is there a how-to on here? with pics?

[Dino]

This helped get me pointed in the right direction...

http://www.antiquecaterpillar.org/vx...l/4L30E_01.asp


I topped mine off the other day using this setup.

[JHarris1385]

Is it just a myth when people say. You dont want to mess with your tranny much. The more the mess with it the more likely it is going to die quicker?

Not to hi jack.

But I plan to do this as well since I am getting 13.4 mpg. I plan to consider de-lifting as well.

[nfpgasmask]

The tranny is not really that hard, but it does take some work, and its pretty messy and a little tedious. If you do it yourself, plan on starting it on a Saturday morning when you have all day to do it.

I used a little hand pump I picked up at Pep Boys to pump in the new trans fluid. I also changed my tranny filter at the same time.

I don't understand that myth, because not servicing your tranny would be more likely to cause it to croak then ignoring it. My VX was shifting like cr@p until I changed my fluid and filter and now she is smooth.

I bought my replacement OEM filter from AutoZone for like $35. It came with a cork gasket that I flattened in between 2 heavy books for 48 hours before I did the change. I would recommend doing the same if your gasket is folded, as it makes it a lot easier when it is flat.

The worse part of the tranny service is filling it up with clean fluid. Our beloved VXes have a difficult tranny to fill, to say the least, and no dipstick, so you need to follow the manuals instructions for filling, which sucks. I used Mobile-1 Synthetic Transmission Fluid. I think you need something like 4-6 quarts if I remember correctly.

Bart

Is it just a myth when people say. You dont want to mess with your tranny much. The more the mess with it the more likely it is going to die quicker?

Not to hi jack.

But I plan to do this as well since I am getting 13.4 mpg. I plan to consider de-lifting as well.

[etlsport]

taking your VX back to stock height wont do much for your gas mileage.. switching back to stock sized tires and lightweight rims will... if your tranny is starting to go anyway, new fluid may speed up the process, new fluid may also show leaks that were already there since the new fluid will be thinner and easier to flow out small gaps