Fuel mileage

[4x4manonbroke]

OK, SO i just read the whole thread ... WOW..

Get a 4 spd , that will fix it .. If you need one PM me and i can get ya hooled up with everything you need .. I have 4 of them in the JY down the street and I'm in with the owners ..

Second myth = 12.5" wide tires =bad MPG ... I have 315/75/16's Cooper AT/3's , getting 20 on the freeway , with leaking HG's and leaking oil ... lol ... Good fuel pressure to the IP is important, and running good diesel supplement helps ( I personally swear by DEX atf ... My personal faveriot ) ..

and yes if you have turned up your pump, its pushing dollar bills out the pipe if you can see black smoke .... I race PSD's all the time before the HG's went ( after 30 years of abuse of course ) ... and i frequently won .. LMAO TOO !!!!

Big open exhaust will help a ton , and big Air cleaners will make HUGE differences .. I started off @ 15 mpg , tuned it up and big air cleaner and some Royal purple 15/40 oil and Z-max ... boom .. 17 mpg , I was happy with that for a while ( all this with 35's 12.5" wide ) .. then i did the exhaust and then went to At's form Mt tires ( saved nearly 24 pounds per tire ) .. all that rolling weight was the killer .. now just before the HG went 20 mpg all day 65 ( with the 3.55's ) ... going about 2200 rpm's ..

OK so with 4.10's and 33's you will be going about 2505 rpm's @ 60 mph
with 3.73 2279 rpm's
with 3.55's 2169


With 4.10's with 35's = 2389 @ 60 mph
with 3.73 with 35's = 2173
with 3.55's with 35's = 2068

Hope all this help ya all out ... Glad to be back here agian

 

[FORDF250HDXLT]

OK, SO i just read the whole thread ... WOW..

Get a 4 spd , that will fix it .

how would a trans with no over drive outperform the E40D in fuel economy?

i can nail 17 mpg with my 8k lb dually box truck on the interstate @ 55 mph with the E40D.

see fuel entry log dated: 2014-05-01
http://ecomodder.com/forum/em-fuel-log.php?vehicleid=5088

 

[prepowerstroke]

Right now it prob would out preform my e4od because mine is junk lol but a 5speed would be the best route


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[FORDF250HDXLT]

oh ok.i just checked the thread out.i see you two biggest issues right here;

1. not having properly tracked fuel economy.- it's all horse shoes and hand grenades,brother.
properly track it,rather than a single estimate and see what you really get.

2.the converter isn't remaining locked. - well you can't have that.that's kinda like driving around with a slipping clutch.
start here at the most likely/free stuff:
http://www.oilburners.net/forums/sh...nce-Of-A-Clean-Trans-Harness-Code-62-amp-More

 

[89Laredo]

15.83 last fill.
6.9/ats 093/c6/3.55

 

[crashnzuk]

Just checked my first tank in the 86 last week. 13.3 driving empty around town and back n forth to work a couple times. That was driving like a milk man. I turned down the fuel about 1 flat to alleviate some of the smoke hoping for better mpg's too), and repaired a leaking return line. She's still a little smokey so I may go down a bit more, time will tell.
Travis..

 

[BDOGONE]

Originally Posted by BDOGONE

I pulled 33x12.50s and went to a 30 1:2" 17 and guess what? Much better ride. No improved MPG with 4:10s. It prob pulls better, but still! 16-17 MPG for me.



Is yours turned up?

No sir! Slow lane E350 with 4x4. She's a chunky girl too!

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[4x4manonbroke]

Lol.. I made the comment as to the fuel eco.. it was awnsered ..

I have had 2 e40'd and they both chit out on me .. so i replaced them with the T-19's .. Much better and more fun to drive too ..

If you have stock tires ( 285/75/16's ) .. then yeah a 5 spd. is king .. but I like my 35's and the 4 spd ...

Its personal when it comes to an auto trans ... like my dodge ... its still a slush box, but i installed a new VB, and presto Fixed

 

[prepowerstroke]

I believe stock tire size is 235/85/16 correct me if I'm wrong lol and yeah we did the 4speed swap into cousins 86 6.9 and it ran slot better lol


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[prepowerstroke]

Alot* and I found a complete 5speed swap on Craig's list for 1,200 bucks is that a good deal?


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[Greg5OH]

4x4 trans? I duno pretty pricey IMO.
i got a compelte 2wd zf5 swap (minus rear DS) for 280.

 

[prepowerstroke]

It's two wheel drive but came out of a f450 with the parking break and he said the parking breaking can come off and a transfer case will bolt right up. And it's fly wheel, clutch, trans, crossmember, drive shaft, clutch pedals, slave cylinder


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[madpogue]

You'll also need the shifter, boot(s), tunnel floor pan, column cover, "fig leaf" for the gear display (however that's done on a brick). Get the master/line/slave as a unit, keep together, keep the master above the slave, _may_ avoid bleeding. T-case linkage may need to be shortened. Frame cross-member probably won't work, since it's from the narrower C&C frame.

Yes, tranny from an F-SD/450 with the driveline parking brAKE is the same bolt-up as a 4x4 tranny. You might still need a different rear driveshaft, as the parking brake may not occupy the same length as the t-case.

And I sure wouldn't call it pricey. $1200 for a working ZF5 with the trimmings is a sweet deal.

 

[4x4manonbroke]

YEah, thats a sweet deal, for sure ...

 

[prepowerstroke]

Yeah hopefully I can get the money together to get it lol


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