Why no 4.27 gears in ford 9"? - Pirate4x4.Com : 4x4 and Off-Road Forum

StuartTX · 07-09-2009, 12:59 PM

I am deciding on gears for my Scout. I have a 9" Ford in the rear and a D44 (not HP) in the front. For the front, 4.27 : 1 gears are common and available. For the rear, only 4.30 : 1 are available. Does it matter? Is there some engineering reason why nobody offers 4.27 for the ford 9" diff?

flatblack92xj · 07-09-2009, 02:47 PM

i personally wouldnt do a 4:27 on the fron and a 4:30 on the rear, i know you can get a with a .01 difference, but .03 might be too much

Black Dog · 07-09-2009, 02:50 PM

4.27 and 4.30 are fine together. No problem whatsoever. Run them.

dane · 07-09-2009, 03:48 PM

2% difference is totally okay, you will be fine with the 4.27 and 4.30.

Dane

flatblack92xj · 07-09-2009, 06:15 PM

wouldnt that be 3%

jenks21 · 07-09-2009, 07:24 PM

You could also jump to a 4.56 if you want them the same and will be about 180 rpm difference. Or like the other guys said.

later
jenks

trkklr77 · 07-09-2009, 07:33 PM

Quote:

Originally Posted by flatblack92xj

wouldnt that be 3%

.03 is 3% 0f 1.

.03 is not 3% of 4.30.

trkklr77 · 07-09-2009, 07:34 PM

run it, you would want a slightly faster gear in the front anyhow. ei chevy's ran 4.09 front 4.11 rear.

82FB · 07-12-2009, 01:47 PM

Lots of Toyota guys run 5.38's and 5.29's with no problems. The difference is less than having worn tires on one end and newer tires on the other end.

Black Dog · 07-13-2009, 03:27 AM

Quote:

Originally Posted by 82FB

Lots of Toyota guys run 5.38's and 5.29's with no problems. The difference is less than having worn tires on one end and newer tires on the other end.

And way less than when you turn a corner.

07-09-2009, 12:59 PM	#1 (permalink)
StuartTX Registered User Join Date: Feb 2008 Member # 109276 Location: San Antonio, TX Posts: 264	Why no 4.27 gears in ford 9"? I am deciding on gears for my Scout. I have a 9" Ford in the rear and a D44 (not HP) in the front. For the front, 4.27 : 1 gears are common and available. For the rear, only 4.30 : 1 are available. Does it matter? Is there some engineering reason why nobody offers 4.27 for the ford 9" diff? __________________ '73 Scout II on 14" jackstands. Last edited by StuartTX; 07-09-2009 at 02:58 PM.

07-09-2009, 02:50 PM	#3 (permalink)
Black Dog Registered User Join Date: Apr 2001 Member # 4140 Location: is everything Posts: 1,010	4.27 and 4.30 are fine together. No problem whatsoever. Run them. __________________ Tim There is no accounting for taste 1936, 1937, 1943, 1950, 1952, 1954, 1955, 1997, 1998, 2002, [B][COLOR="Red"]2008[/COLOR][/B].

07-09-2009, 03:48 PM	#4 (permalink)
dane THIS SPACE FOR RENT Join Date: Aug 2003 Member # 21948 Location: Elk Grove, CA Posts: 3,933	2% difference is totally okay, you will be fine with the 4.27 and 4.30. Dane __________________ HOOLIGAN ROCK CREW SEE WHAT THE HYPE IS ALL ABOUT: http://www.facebook.com/hooliganrockcrew I WILL TRY BEING NICER IF YOU TRY BEING SMARTER. FU JS FU KS FU RTF FU FOTR FU DA FU RMK

07-09-2009, 07:34 PM	#8 (permalink)
trkklr77 skullfuckery Join Date: Apr 2004 Member # 29016 Location: galt ca, because i wanted my own backyard Posts: 15,206	run it, you would want a slightly faster gear in the front anyhow. ei chevy's ran 4.09 front 4.11 rear. __________________ Impeach or revolt, which will it be? buy my quad http://www.pirate4x4.com/forum/vehic...00-2500-a.html I WILL TRADE FOR A ROAD WORTHY 55-57 or 71-87 CHEVY 2WD PICK UP

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07-09-2009, 02:47 PM	#2 (permalink)
flatblack92xj Registered User Join Date: Feb 2009 Member # 130324 Location: Des moines, Iowa Posts: 219	i personally wouldnt do a 4:27 on the fron and a 4:30 on the rear, i know you can get a with a .01 difference, but .03 might be too much

07-09-2009, 06:15 PM	#5 (permalink)
flatblack92xj Registered User Join Date: Feb 2009 Member # 130324 Location: Des moines, Iowa Posts: 219	wouldnt that be 3%

07-09-2009, 07:24 PM	#6 (permalink)
jenks21 Registered User Join Date: Jan 2008 Member # 106427 Location: Central Illinois Posts: 386	You could also jump to a 4.56 if you want them the same and will be about 180 rpm difference. Or like the other guys said. later jenks

07-12-2009, 01:47 PM	#9 (permalink)
82FB Registered User Join Date: Feb 2000 Member # 41 Location: Ventura County, CA Posts: 3,238	Lots of Toyota guys run 5.38's and 5.29's with no problems. The difference is less than having worn tires on one end and newer tires on the other end.