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1971 Bronco running on a 4.9/300 with a NP435/205
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Discussion Starter #1 (Edited)
I have a 71 Bronco with 38" tires, 4.9L/300 and an NP435, and I need to change the gears to make it highway-friendly, but still keep it offroad capable. As it is right, it way too low, it's set up for crawling and it doesn't pass 40 mph. I don't know what's in it. I was thinking about putting 456s.

I changed the tires to 38x13 (the ones in the pics 39x18.5)

Any thoughts? Thank you.

Does anyone know a good and honest off-road mechanic in the Catskills area?












 

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It doesn't pass 40mph? Whats happening at 40 that makes you think it wont go any faster?
 

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1971 Bronco running on a 4.9/300 with a NP435/205
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58 Posts
Discussion Starter #3
It doesn't pass 40mph? Whats happening at 40 that makes you think it wont go any faster?
It's on top of the 4th gear with revs are out of the roof and engine screaming. It was set up for hardcore crawling.
 

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Sounds perfect to me as is!
My f250 is on 40s but i am getting ready to bob the back end to make it shorte! I bet we meet in the middle.
WTF is this :homer: Guy asks about his gears in his Bronco and you start posting pictures of your truck talking about bobbing it.



Anyway, your Bronco sounds like it has a great combo as is for off-road. Why is it you need to drive on the highway again? 4:88 is a good ratio for the mix.
 

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Take the transfer case out of low range

With 5.38s, youd be 2k rpm at 40mph.
This.
Also, are you sure it's a 4.9?
That is not a commonly (like ever) swapped motor into an EB.
 

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1971 Bronco running on a 4.9/300 with a NP435/205
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58 Posts
Discussion Starter #15
This.
Also, are you sure it's a 4.9?
That is not a commonly (like ever) swapped motor into an EB.

Hi, I know. But the previous owner put a 4.9L/300 long block and moved the radiator to the back.
 

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1971 Bronco running on a 4.9/300 with a NP435/205
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58 Posts
Discussion Starter #17
maybe he has d60/70s with 7.17 gears

probably not though :flipoff2:
It sure feels like it, if not even more. I have no idea what's in there. This is my first offroad vehicle. 1st gear screams to change at 7mph.
 

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1971 Bronco running on a 4.9/300 with a NP435/205
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Discussion Starter #20 (Edited)
But "hardcore rockcrawler" :laughing:

That's what I was told, ahahahahah. I don't know, this is my first offroad vehicle.

Does anyone know a good and honest off-road mechanic in the Catskills area? I'm in Kingston/Woodstock area.
 
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