1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Rear end ?

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Old

Jan 31, 2015 | 09:09 PM

#1

19711969

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Rear end ?

I'm not interested in pulling a trailer. I just want to be able to take off without burning up the clutch. I'm thinking about a 3.25 or a 3.00. What do you guys think?

71 f100 300 i6

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Old

Jan 31, 2015 | 09:37 PM

#2

hillcountryflt

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Quote:

Originally Posted by 19711969

I'm not interested in pulling a trailer. I just want to be able to take off without burning up the clutch. I'm thinking about a 3.25 or a 3.00. What do you guys think?

71 f100 300 i6

Well how big of a trailer?

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Old

Jan 31, 2015 | 09:43 PM

#3

19711969

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Quote:

Originally Posted by hillcountryflt

Well how big of a trailer?

Sorry I may have been misleading but I won't be pulling a trailer

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Old

Jan 31, 2015 | 10:06 PM

#4

HIO Silver

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From: NorCal

3.25 to 3.50 is a good compromise btwn coming outta the hole and highway RPMs.

... but if it'' more long distance driving ya do then I'd opt for the 3.25.

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Old

Jan 31, 2015 | 10:11 PM

#5

19711969

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Thanks!!! HIO silver. I also forgot to mention it has a 3.70 in it now.

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Old

Jan 31, 2015 | 11:04 PM

#6

ultraranger

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From: El Dorado, Arkansas

Quote:

Originally Posted by 19711969

Thanks!!! HIO silver. I also forgot to mention it has a 3.70 in it now.

Six cylinder trucks, 240/300, often have 3.50 or 3.70 rear end gears. My '69 F100 has a 240 with 3.50 gears.

The truck is your and the choice is your but, it would be better to add an overdrive transmission than to chunk the current 'chunk.'

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Old

Feb 1, 2015 | 04:36 AM

#7

jowilker

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I suggest keeping the rear that you have and start looking for an OD tranny that would allow you to keep what you have on take off but drop the Rs on the hiway.

Out of the 2 mentioned 3.25 for a 6 banger.

John

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Old

Feb 1, 2015 | 06:08 AM

#8

elgemcdlf

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If you are burning up the clutch that problem is in the clutch not the rear.

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Old

Feb 1, 2015 | 07:23 AM

#9

gfw1985

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From: Raphine, Virginia

3.00/3.25 would be a higher gear ration than the 3.70 making takeoff harder, not easier. Either you are wrong on the ratio or you have other issues. Tire size can play a part. Can't imagine 3.70 gears being an issue unless running 35"-37" tires.

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Old

Feb 1, 2015 | 07:36 AM

#10

hillcountryflt

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Quote:

Originally Posted by 19711969

Sorry I may have been misleading but I won't be pulling a trailer

Don't know what I thinking when I wrote that response.

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Old

Feb 1, 2015 | 09:49 AM

#11

orich

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From: **** hole San Jose ca.

Don't know what your smoking, but put the pipe down and go to bed.
Orich

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Old

Feb 1, 2015 | 10:56 AM

#12

Tedster9

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From: Waterloo, Iowa

3:70 is sort of the catch-all gearing, jack of all trades? Seems to be common for pickups anyway. Is it considered acceptable for highway speeds (60-70) driven by 6 cylinders? V8?

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