35s help mpg?
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Joined: Nov 2013
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35s help mpg?
I got a 89 7.3 with c6 3 speed tranny, I get ****ty mileage and at 45mph I'm at 2k rpms I got a set of 35x12.5. Do u think if I put those on it will stretch my gears out more helping mpgs at all?
Fleet Owner
Joined: Jul 2006
Posts: 20,382
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From: Mi'kma'ki
lol no.lifting a truck hurts economy,as does adding 12.5 wide rubber.an OD trans swap is the only real way to gain economy from the old school c6 trans.sounds like you have 4.10 gears too which doesn't help.swapping a 3.55 rear will help a bit.not like adding an od trans of course but something.
Logistics Pro
Joined: Mar 2012
Posts: 3,507
Likes: 121
From: Oregon
Bigger tires kill MPG. End of story. I had 35's and HATED them in every way. I have 33's now and they are still on the big side. But they don't make the Duratracs in 31's or 32's so 33's are my only choice.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
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From: Caracas, Venezuela
They do make the Duratracs in 31x10.5 size, I researched this when I bought my tires because I considered importing them. Amazon carried them.
See?:
See?:
Logistics Pro
Joined: Mar 2012
Posts: 3,507
Likes: 121
From: Oregon
They do make the Duratracs in 31x10.5 size, I researched this when I bought my tires because I considered importing them. Amazon carried them.
See?: Amazon.com: Goodyear Wrangler DuraTrac Radial Tire - 31/1050R15 109Q: Automotive
See?: Amazon.com: Goodyear Wrangler DuraTrac Radial Tire - 31/1050R15 109Q: Automotive
i ain't rite
Joined: Mar 2005
Posts: 65,569
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From: Marlboro Mental Hospital.
7.3 with 4.10 gears C6 trans and 35X12.5X16.5 radials should give you around 14 mpg.
the 35's will raise mpg on the highway, but lower mpg around town.
the 35's will raise mpg on the highway, but lower mpg around town.
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Posting Guru
Joined: Dec 2011
Posts: 1,247
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From: monroe ct
My mpg went up when I switched to 35s. I have 3.73 gears and was averaging 10 mpg, now after adding the tires I average 11. I say go for it.
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Tuned
Joined: Sep 2010
Posts: 473
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From: Farmington, MO
Hands down, change the C6 out to an overdrive trans. The only thing I use a C6 in is a trail rig or drag truck. C6 for normal use is just no good on the fuel mileage. I had a Bronco for my daily commute, when I first got it it had the C6, I swapped it out with an E4OD trans and gained about 6mpg just from that.
Fleet Owner
Joined: Jul 2006
Posts: 20,382
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From: Mi'kma'ki
you heard correctly.you can find an idi truck that came with an e40d and get it's stand alone computer for the trans along with the wiring harness at a salvage yard or buy an aftermarket controller.you'd have to love your truck though as it would be much easier and perhaps just cheaper to just sell your truck and buy an all running idi truck with a e40d trans already.
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