Overdrive

[J20jeepster]

Has any one ever found an after-market overdrive for their FSJ?
I am probably just dreaming.

[jMedia]

I don't believe there is an overdrive application that will fit to a stock jeep setup. Most who want OD end up changing transmissions altogether

search is your friend :D (tho I can't talk cause I've probably asked the same)

[Cecil14]

Been covered a LOT of different times. Every type or solution for OD has been covered here at some point. Searching is going to be rough as there are so many threads out there. You'll have better luck if you know the exact specs for the application you're trying to put OD into. ie: 360/T-18/D20 rig, or 258/TF727/NP229. Lots of different options depending on what you're looking for. :)


aa

[mdill]

Lot's of options, nothing cheap.

[J20jeepster]

Lot's of options, nothing cheap.
I was afraid of that. Oh well scratch that plan.
Has anyone found the best way to get better gas mileage out of their FSJ 258 or 360? From what I hear there just is no way. I do remember one thread I read about someone putting a fuel injector on their 360 and getting 16-18 mpgs. I don't know if I believe it though.

[jMedia]

I know efi can help, not that much tho. I've driven 8hrs back and forth a couple times in my wag and driving habits is what improved my mpg the most. Drove pretty slow last time and I got bout 14mpg versus about 11 driving faster.

That shifting into final gear with no OD at about 40 doesn't help haha

[Dirt Wag]

lock up torque converter?

[Chris P.]

I vote TBI as the next option for mileage if you don't want to go with an overdrive tranny. With my junkyard built system I have gotten oven 17mpg with a 360 in a J10. A few others here have had the same results.

[ralf]

I am toying with the idea of A FAST EZ-EFI TBI set up for my 360.

[J20jeepster]

I've driven 8hrs back and forth a couple times in my wag and driving habits is what improved my mpg the most. Drove pretty slow last time and I got bout 14mpg versus about 11 driving faster
I do that when I can, but when I hop on to 97 when I am late for work along with every one else, people kind of try to start road rage! (-: Bad idea against a j20 even though I never retaliate!:drivin:

From what I have seen TBIs are running about 1,000 bucks. You guys find something I didn't?

[TatankaJ20]

I'm nearlly finished putting a gear vendors on mine.I'll post info when done. Your only other option is a Ristow custom case, or tranny change.

[will e]

I'm nearlly finished putting a gear vendors on mine.I'll post info when done. Your only other option is a Ristow custom case, or tranny change.

The GV should be interesting. Last I checked they didn't have a bolt in option for our jeeps. How'd ya do it? I would love this option.

[CHICOWAGGY]

I do that when I can, but when I hop on to 97 when I am late for work along with every one else, people kind of try to start road rage! (-: Bad idea against a j20 even though I never retaliate!:drivin:

From what I have seen TBIs are running about 1,000 bucks. You guys find something I didn't?.

Yes, a good wrecking yard:p . Building one from wrecking yard parts is cheapest. Usually you can get everything you need for around $200. If you include fuel pump, adapters, and all the little things you need you can do it yourself for less than $500.

[shackwrrr]

http://www.bjsoffroad.com/CartGenie/prod-506.htm

that i think is the cheapest and easiest way to do it. You can pick up 700r4s up for cheap and build them for longevity/power. they also have both drivers side and passenger side drop transfer cases

http://www.bjsoffroad.com/cartgenie/images/large/24-6252.jpg

[WHSII]

In the early 80's, I had a 1970 Jeep Gladiator, 6 cyl, (232 I think) three speed standard. It got 12 MPG, empty, loaded, overloaded, in four wheel drive, low range, it just got 12MPG...

I friend drew on an envelope, a gas saving device that he said I could make for ten dollars or less.

I took 2 3/4" copper Tee's, and a piece of 3", 3/4" copper tubing and soldered them together. I turned the 90 of each tee in opposite directions...

I soldered in a cap on each end of the long tube, drilled a 3/8" hole in the caps, and soldered in a foot of 3/8" copper tube. While I was at it, I took a piece of #14 copper wire, and soldered it around the open end of the Tees, so I could have a seal to clamp the supply heater hose, (I cannot remember, I might have soldered in a 1" nipple to keep the dia to 3/4")

Running the supply of hot water to one end of the device, and clamped the other end of the cut radiator hose that supplied the heater core, to the other end of the copper device. Once I found that my solder joints held the water pressure, I ran my gas line through the 3/8" copper.

I gained three MPG by doing this...

I added the same device on a 1979 Grand Wagoner, 360 engine, with Quadratic, and went from 9 or 10 MPG to 12 to 13 MPG.

My project truck now is a 1980 Jeep J10 Honcho, I will add it to this truck once I have it back on the road.

The theory is that we are heating the fuel, so that it atomizes quicker once it enters the manifold. If you have the tubing length for the device too long, on hot summer days, you could vapor lock... Shorten it, or use clothes pens, or tin foil as they did back in the day... (anyone remember that?)

I do not know if it will work with fuel injection, but I will try it some day...


Hope this helps or at least starts people thinking...

WH