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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

4wd thought...

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Old Mar 14, 2009 | 05:06 PM
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From: Blue Eye, mo. hwy 86 & JJ
4wd thought...

well i've been looking at a 4wd conversion and i know i need a front diff to match the back diff, well if i have different size tires on the back than i do the front that changes the gear ratio, so do i need a set of tires that completely match?
i probably butchered all gramatical rules in that paragraph but please forgive me... after all you cant spell slaughter without laughter!
 
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Old Mar 14, 2009 | 06:36 PM
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If I was going to run 4x4, I'd want to have the same size tires all the way around. I mean, sure, it probably wouldn't hurt anything out in some mud, but if I wanted to use it a lot, I'd definitely have matched tires.
 
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Old Mar 14, 2009 | 06:58 PM
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You do need tires that completely match.
 
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Old Mar 15, 2009 | 12:40 PM
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Not to step on your toes, but I think it would look retarded without them matching.
 
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Old Mar 15, 2009 | 07:48 PM
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From: Blue Eye, mo. hwy 86 & JJ
you'd have to see it.... see my thread, re: really deep rims
put some 15x12 wheels on the back runnin 295's, have a different tire heigth on the front ( and obiviously different width too) looks great on the stepside bed. perhaps you wouldent like it but me and people around here tend to.
FYI; i'd like to see real picture of that 85 lariat, sounds like somthing to see
EDIT: diddent think to check your gallery, feel dumb now..... sharp lookin truck anyways
 
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Old Mar 15, 2009 | 09:21 PM
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Run the same size tires if you are gonna use 4WD at all on the street. Unless you like rebuilding transfer cases and replacing u-joints all the time.

Now I've heard of guys running different tire sizes and even gear ratios front to rear in mud drags, but that's sort of a different application than a street truck.
 
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Old Mar 15, 2009 | 11:30 PM
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From: Blue Eye, mo. hwy 86 & JJ
only time i'd be using it would be in the snow occasionally and to play in fields with..... also do they need to be identical or is there a close enough? will use the same gear ratio, heard way to many horror stories about that.... also is there a quick and easy way to uncover my ratio?
and no my speedometer dosent work but my tach does
 
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Old Mar 18, 2009 | 01:00 PM
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Originally Posted by hittman1422
only time i'd be using it would be in the snow occasionally and to play in fields with..... also do they need to be identical or is there a close enough? will use the same gear ratio, heard way to many horror stories about that.... also is there a quick and easy way to uncover my ratio?
and no my speedometer dosent work but my tach does
Jack up the rear and spin the rear wheels around one time and count how many times the driveshaft turns. That's your axle ratio. Make sure you spin both rear wheels together if you don't have a limited slip or the driveshaft will turn double your gear ratio.
 
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Old Mar 18, 2009 | 02:21 PM
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As close as you can get. They should be the same brand tire front and rear as well as the same size.
 
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