Oversized tires
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Senior User
Joined: May 2011
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From: Morgantown, WV
Oversized tires
1988 f150 300 np435 4x4 with 3.08 gears.
I'm looking into buying some off road tires. Looking at the Goodyear MTRS 33-12.50x15. Also putting a 4" lift on the truck.
I'm curious to whether or not my current driveline will be good to turn these tires. I'm worried about the 3.08 gears. It's not a highway truck, pretty much just around town and offloading beater truck.
Will the 3.08 turn them knobby 33s ok or will have have to regear it?
I'm looking into buying some off road tires. Looking at the Goodyear MTRS 33-12.50x15. Also putting a 4" lift on the truck.
I'm curious to whether or not my current driveline will be good to turn these tires. I'm worried about the 3.08 gears. It's not a highway truck, pretty much just around town and offloading beater truck.
Will the 3.08 turn them knobby 33s ok or will have have to regear it?
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Senior User
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From: Morgantown, WV
It's the new process 4 speed with granny so I'm used to it being slow lol
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Senior User
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From: Morgantown, WV
I figured as much. Probably the only way I would regear it is if I found a donor truck with complete axles and swap everything. This truck however is pretty much going to turn into a woods/mud/beater truck that I also drive to work across town. I have my 89 f250 7.3l for highways trips or hauling.
Fleet Owner
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From: Kentucky
Even more reasons why you need the proper gears.
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Fleet Owner
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From: Gilbert, PA
Agreed. Unless it never left the dirt and you just always ran 4low
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From: Laramie, WY
NothingSpecial has a good point. If you're set on 33s, do it, try it out, and if it's a $1000 problem to you, regear. I have 33x10.5 with 3.55:1 and a 5.8L/E4OD, don't think I'd be ok with any less gear myself, but you might find it tolerable.
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From: Morgantown, WV
Well I bought the truck off my friend for $200, used lift kit for $165, another $200+ in parts to get it running. It's a very cheap build/beater truck. Tires I figure I can put on something else when this one dies. Frame has been patched before and it has 175K miles. Not trying to spend $1000+ on regearing it if I can help it lol.
Laughing Gas
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Did most of you that replied forget that the 435 doesn't have OD and has a 6.69:1 1st or are you all running 302s with no compression and a 500lb toolbox in the bed?
HE WILL HAVE A DEEPER EFFECTIVE 1ST GEAR RATIO THAN A TRUCK ON 29" TIRES WITH 4.10s AND AN M5OD.
He'll also have a slightly deeper 4th gear than 5th on an M5OD or ZF with 3.08s and 29" tires.
Yes he'll find himself wanting to downshift into 1st more often with 33s than 29s. Off road he can probably suck it up and just stay in 1st more.
On road performance will be fine. There will still be a big split between 3rd and 4th because it's still an NP435, it might actually move 3rd and 4th up to more useful speeds. 2nd with the 435, 33s and 3.08 is going to be only slightly taller than 1st in an M5OD with 4.10s and 29" tires he should have no problem.
I can't see why everyone thinks 33s will be too much tire for OP's truck. It should be right in the middle of what trans + tire + axle ratios are good for general use and probably a little on the deep side fuel economy.
Run the numbers before you run your mouth:
Calulators from www.4Lo.com
https://www.ford-trucks.com/forums/8...tml#post544558
The Novak Guide to the New Process 435 Transmission
HE WILL HAVE A DEEPER EFFECTIVE 1ST GEAR RATIO THAN A TRUCK ON 29" TIRES WITH 4.10s AND AN M5OD.
He'll also have a slightly deeper 4th gear than 5th on an M5OD or ZF with 3.08s and 29" tires.
Yes he'll find himself wanting to downshift into 1st more often with 33s than 29s. Off road he can probably suck it up and just stay in 1st more.
On road performance will be fine. There will still be a big split between 3rd and 4th because it's still an NP435, it might actually move 3rd and 4th up to more useful speeds. 2nd with the 435, 33s and 3.08 is going to be only slightly taller than 1st in an M5OD with 4.10s and 29" tires he should have no problem.
I can't see why everyone thinks 33s will be too much tire for OP's truck. It should be right in the middle of what trans + tire + axle ratios are good for general use and probably a little on the deep side fuel economy.
Run the numbers before you run your mouth:
Calulators from www.4Lo.com
https://www.ford-trucks.com/forums/8...tml#post544558
The Novak Guide to the New Process 435 Transmission
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