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 patgizz
Senior Moderator Member
Posts: 8098
Loc: Cleveland, OH
Reg: 01-30-00
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03-13-08 03:40 PM - Post#1387240
specifically i am looking for what someone with a 454 TBI dually is getting with either the 5 speed overdrive manual (91-95) or the 4L80-E.
my mileage sucks with the SM465 non overdrive manual, and i need to see what i would be comparing to for gas savings to decide if it would be worth it or not to sink the cash into a tranny swap.
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Marv D
Contributor
Posts: 218
Loc: Arizona
Reg: 05-29-07
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03-13-08 07:17 PM - Post#1387379
In response to patgizz
Pat, you want me to tell you how to 'fix' the mileage <grin>
Sorry, really have nothing for you. I know my fuel vendor runs a 70's 1-ton 454 carb'd motor with 4.10 gears ,, he is lucky to get 8-10 with a couple of drums of fuel and a liftgate on the back. He hates the truck with fuel at $3.25 here.
BTW, pulled the trigger on a new motor for my 94, anbd have it at the body shop getting prettied up. One of these days I'm going to have to get all this junk I own in one picture,,, WIDE angle lense no doubt. (I'm almost to catch up with you!)<grin>
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conquista90
Member
Posts: 103
Age: 22
Loc: Austin, TX
Reg: 05-19-06
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03-13-08 09:53 PM - Post#1387474
In response to Marv D
I know a kid who can get as good as 12-14MPG if he keeps his foot out of it. But in spirited driving, he says he can get as bad as 6-8MPG.
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Boosted 1
Member
Posts: 179
Loc: Downey,Ca.
Reg: 10-26-06
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03-13-08 10:52 PM - Post#1387492
In response to patgizz
I have a 92 3500 dually 454,TBI,4L80E,and mileage sucks about 8 mpg on a good day ! Its almost how many gallons to the mile 
92 3500 toy hauler, 63,70,Nova,83 Shovel, Blown with N2o 90 step side  |
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cdmhenry
Very Senior Member
Posts: 2248
Loc: Minden, NV.
Reg: 09-14-00
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03-14-08 05:13 PM - Post#1388118
In response to patgizz
My '91 454SS with 4L80E, 4:10 & TBI got just under 14mpg on a 1K trip through the mountains (March 3). It usually gets around 13mpg on the open road regardless of conditions, bed full of junk or empty.
It does have a Comp Cams 302 and slightly cleaned up heads & intake.
Best thing I ever did for mileage is change to a heated O2 sensor. Oh, I also changed it over to a Vette knock sensor. The original knock sensor is too sensitive.
IMO, there is nothing much you can do to justify the swap based on mileage. Although the 4L80E is a great tranny. You'll need a matching ECU for the swap - so keep an eye out. The trannys are not hard to find.
| Every Government Interference In The Economy Consists Of Giving Unearned Benefit, Extorted By Force, To Some People At The Expense Of Others - Ayn Rand |
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drtyler (4)
