Rearend Gears
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Elder User
Joined: Dec 2004
Posts: 575
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From: Western Pa
Rearend Gears
1990 F150 4x4, 300 I-6, E4OD
I currently have 32x11.50 tires. I'm just wondering what gears I should throw in my rearend (a Ford 9-inch) so I can cruise at lower revs at 65.
Thanks for the help.
I currently have 32x11.50 tires. I'm just wondering what gears I should throw in my rearend (a Ford 9-inch) so I can cruise at lower revs at 65.
Thanks for the help.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by F15090300
1990 F150 4x4, 300 I-6, E4OD
I currently have 32x11.50 tires. I'm just wondering what gears I should throw in my rearend (a Ford 9-inch) so I can cruise at lower revs at 65.
Thanks for the help.
I currently have 32x11.50 tires. I'm just wondering what gears I should throw in my rearend (a Ford 9-inch) so I can cruise at lower revs at 65.
Thanks for the help.
Lead Driver
Joined: Jul 2005
Posts: 5,967
Likes: 7
From: Eccles, WV
I would say that he has 3.55. A change to 3.73 would improve drivability with the 32's. 4.10's would kill the top end, but make it a monster getting out of the hole. Fuel mileage would also suffer with the 4.10's.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Ford never made a 3.10 ratio in either the 8.8" or the 9" axle that I know of.
Since a 9" wouldn't have been factory issue in your 1990 truck, are you sure that's even what axle you have?
If better gas mileage is what you want, consider that the cost of changing out both the front and rear axle gears is going to be close to $1200. How much gas does that buy you? Remember you're driving a 5000 lb truck around regardless of what gears are in it.
Since a 9" wouldn't have been factory issue in your 1990 truck, are you sure that's even what axle you have?
If better gas mileage is what you want, consider that the cost of changing out both the front and rear axle gears is going to be close to $1200. How much gas does that buy you? Remember you're driving a 5000 lb truck around regardless of what gears are in it.
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Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
go to 35" narrower tires and rims on 16 or 17 rims, gives about 10% drop in cruise rpm, less tire wind and road rolling resistance=better fuel mileage. save the wide 32" for weekend boy toy playing in the mud. run the tires at near max pressure.
far cheaper than changing 2 r/P sets and more adaptable.
far cheaper than changing 2 r/P sets and more adaptable.
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Thread Starter
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Elder User
Joined: Dec 2004
Posts: 575
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From: Western Pa
I'll get skinny 32's or 31's before next winter. I'd probably need a lift for 35's, unless I got really skinny ones, otherwise, they'd still fit under the wheelwells, but they'd rub the frame like crazy. I'm getting a little frame rub from the wide 32's.
Thanks for the gear help guys. I probably wont throw in gears, I was just wondering what gears would help me cruise better.
Thanks for the gear help guys. I probably wont throw in gears, I was just wondering what gears would help me cruise better.
Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
Originally Posted by andym
Ford never made a 3.10 ratio in either the 8.8" or the 9" axle that I know of.
I had one in an old 65 Ford Country Squire Wagon.