GEAR questions?

jrh_1980 · April 24th, 2008, 02:02 AM

I currently have a 4.10 gear in the rear and i feel like im not utilizing the torque of the motor. I think that if i went to like a 3.73 i might notice an improvement. don't get me wrong it launches hard but i spend more time shifting than anything else. I had a thought, please chime in if i am way off course here. if i buy a 3.55 gear set and did some mis matching i could end up with 4 possible variations. 3.55, 3.73, 3.90, 4.10. does the tooth pitch change with the different ratios?

Hunt_chevs · April 24th, 2008, 04:09 AM

i can only agree more. i went with 3.73s

e3sean · April 24th, 2008, 04:30 AM

i would love to find a set of 3.90 for mine

e3sean · April 24th, 2008, 04:31 AM

have you ran the quarter mile where were you at the end of it? like the end of forth the beginning of fifth?

8t6gt · April 24th, 2008, 04:32 AM

I got 3.73's and I wouldnt go any lower

Like numericaly higher

jrh_1980 · April 24th, 2008, 09:06 AM

I haven't run the quarter yet. I am going to wait to do any gear changes til after I see how i do.

86_Notch · April 24th, 2008, 07:26 PM

run a taller tire an see if your car likes it better, if so then get the 373s , if not keep the 410

90 lx notch · April 25th, 2008, 12:26 AM

+1 good idea

ryans88gt · April 25th, 2008, 12:31 AM

you cannot mismatch gear parts. The ring gears and pinion heads are different thicknesses. I personally would want 4.10 gears unless I was running the 1/8th mile and then I would go for 4.56 or higher. You will not notice that much of a difference with 3.73s vs 4.10s. it is only like 100-200 rpm difference.

jrh_1980 · April 25th, 2008, 01:28 AM

thanks ryans88. I was wondering if the pitch and stuff was the same or not. my current tires are 275/50/15 BFG drag radials. I was thinking about going with a 275/60/ 15 MT drag radial. it should be almost 2 inches taller will that make much difference.

nba1341 · April 25th, 2008, 02:01 AM

then your gear ratio will be closer to 3.73 just do that

April 24th, 2008, 02:02 AM	#1
jrh_1980 Regular 89 Mustang LX Join Date: Feb 2008 Location: Macomb, Illinois Posts: 151	GEAR questions? I currently have a 4.10 gear in the rear and i feel like im not utilizing the torque of the motor. I think that if i went to like a 3.73 i might notice an improvement. don't get me wrong it launches hard but i spend more time shifting than anything else. I had a thought, please chime in if i am way off course here. if i buy a 3.55 gear set and did some mis matching i could end up with 4 possible variations. 3.55, 3.73, 3.90, 4.10. does the tooth pitch change with the different ratios?

April 24th, 2008, 04:30 AM	#3
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,575	i would love to find a set of 3.90 for mine __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

April 24th, 2008, 04:31 AM	#4
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,575	have you ran the quarter mile where were you at the end of it? like the end of forth the beginning of fifth? __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

April 25th, 2008, 12:26 AM	#8
90 lx notch Newbie 1990 mustang lx notch no track time Join Date: Apr 2008 Location: baltimore md Posts: 44	+1 good idea __________________ 90 LX NOTCH elec. fan, fenderwell intake, adjustable fuel reg w/ gauge, 75mm pro-m meter, 75mm ford racing tb and egr spacer, bbk pulleys & headers & offroad x-pipe, slp catback, 5 lug conversion, bullitt rims, 3.73 gears, battery relocation

April 25th, 2008, 12:31 AM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	you cannot mismatch gear parts. The ring gears and pinion heads are different thicknesses. I personally would want 4.10 gears unless I was running the 1/8th mile and then I would go for 4.56 or higher. You will not notice that much of a difference with 3.73s vs 4.10s. it is only like 100-200 rpm difference. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

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April 24th, 2008, 04:09 AM	#2
Hunt_chevs Hardcore Enthusiast 88 Gt Not Slow Join Date: Aug 2007 Location: SJ-CA, 50-ft elev. Posts: 1,580	i can only agree more. i went with 3.73s

April 24th, 2008, 09:06 AM	#6
jrh_1980 Regular 89 Mustang LX Join Date: Feb 2008 Location: Macomb, Illinois Posts: 151	I haven't run the quarter yet. I am going to wait to do any gear changes til after I see how i do.

April 24th, 2008, 07:26 PM	#7
86_Notch Enthusiast 1986 lx notch 10.78 @ 124.96 Join Date: Mar 2007 Location: Delaware Posts: 772	run a taller tire an see if your car likes it better, if so then get the 373s , if not keep the 410

April 25th, 2008, 01:28 AM	#10
jrh_1980 Regular 89 Mustang LX Join Date: Feb 2008 Location: Macomb, Illinois Posts: 151	thanks ryans88. I was wondering if the pitch and stuff was the same or not. my current tires are 275/50/15 BFG drag radials. I was thinking about going with a 275/60/ 15 MT drag radial. it should be almost 2 inches taller will that make much difference.

April 25th, 2008, 02:01 AM	#11
nba1341 Banned 1965 Mustang Fastback Join Date: Apr 2007 Location: Los Angeles, Cal Posts: 24,982 Posts: 2,195	then your gear ratio will be closer to 3.73 just do that

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