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  #1  
Old 04-04-2005, 03:28 AM
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paddyp paddyp is offline
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I don't drive my Wag much on the streets except for to and from trails, which can include highway trips occasionally. I am about to re-gear, and was wondering if 4.09s are too low for 31" tires. I am eventually going bigger on tire size, but have to live with the 31s for now. Will I be able to drive over 50MPH on the highway, or should I just stick with 3.73s?
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78 Wagoneer "Trusty Rusty"
360/TH400/Part-Time QT/ D44 Locked Front/Welded Rear/31x10.50x15 BFG M/T
Soon to come: 4.09 gears, SOA/shackle flip, 33x12.50x15 Swamper TSLs
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  #2  
Old 04-04-2005, 03:45 AM
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Amc71601 Amc71601 is offline
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Mine does ok with 4.09's and 33's.It will do at least 70mph, and that's with a little 258.It didn't do too bad when I had 31's on it,just a little more rpm's on the hwy.
I would put the 4.09's in if you plan on stepping up tire sizes IMHO.
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Old 04-04-2005, 03:54 AM
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mechanical man mechanical man is offline
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I put 3.92s with 32's in my 87 and it is fine for highway driving-most of what it gets. The drivetrain is a little noisier but not objectionable. If I were going primarily for off-road performance I'd go up to the 4.56 range.
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87 GW, B.J.s 4" lift, 3.92s, ARBs f&r, 32-11.50-15s BFG ATs, Eldebrock Performer/Holley 4160 4bbl, Thorley headers, Z&M HEI, Flowmaster 70 Series, just about everything mechanical rebuilt.

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  #4  
Old 04-04-2005, 11:38 PM
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paddyp paddyp is offline
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Thanks for the info...I may go the 4.56 route because of a sale.
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78 Wagoneer "Trusty Rusty"
360/TH400/Part-Time QT/ D44 Locked Front/Welded Rear/31x10.50x15 BFG M/T
Soon to come: 4.09 gears, SOA/shackle flip, 33x12.50x15 Swamper TSLs
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  #5  
Old 04-05-2005, 04:13 AM
waggin'ear waggin'ear is offline
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You'll be screaming with 4.56s and 31s on the highway.

My CUCV has 4.56's and 32's. I turn about 3000 rpms at 60mph. You would be slightly higher.

Not saying not to do it, but you won't want to take long trips in it.
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  #6  
Old 04-05-2005, 05:39 AM
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paddyp paddyp is offline
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Yeah, got a case of the bigger, more syndrome for a minute. Think it will be 4.09s now.
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78 Wagoneer "Trusty Rusty"
360/TH400/Part-Time QT/ D44 Locked Front/Welded Rear/31x10.50x15 BFG M/T
Soon to come: 4.09 gears, SOA/shackle flip, 33x12.50x15 Swamper TSLs
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  #7  
Old 04-05-2005, 08:02 AM
rockcandy rockcandy is offline
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I say 4.09 would be fine. No need to go to 4.56 since that would be in the 35+" tire range. I believe that is too big for 5000lb+ rigs w/lockers running 1/2ton gear. I did it for a short time but had to tip toe everywhere.
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