3.73s or 3.90s?

DILO2001GT · October 12th, 2005, 11:59 PM

iight im barely getting there but right before i finish maybe a couple car lengths im hitting the rev limiter in the 1320'. i wonder if i should look into 3.73s or if 3.90s will do it. though if i do 3.90s those gears cost more and i don't know if thats a big enough difference from the 4.10s to make me finish right where i want to be. what do you guys think.

also mind you that over the winter im adding stage 2 cams, stall converter, P&P my heads, headers and i'll be hooking up better with some suspension mods. thanks!!

mdvaldosta · October 13th, 2005, 09:58 AM

Im assuming you've got 4.10's now?

Don't go lower. I did it, and ended up switching back. Get a taller tire for the track instead, or raise your rev limiter.

fallstar01 · October 13th, 2005, 03:32 PM

You've got me thinking now. Do I stick 4.10s in my daily driver boosted mustang? Since I'm trapping at 110 now, I think I could probably do really well with them at the strip. I'd really like to test drive a mustang with 4.10s though.

mdvaldosta · October 13th, 2005, 04:35 PM

I trapped at 115 with 4.10's hitting the rev limiter for 150 feet and 122mph with 3.73's right at the rev limiter, this is with street tires. Even though I trapped much faster with the 3.73's and hit the limiter with 4.10's, my 1/4 times were identical (11.90's).

Once I started running slicks, I ran a best of 11.80 @ 116mph (1.7x 60's) with the 3.73's. Dumbfounded as to why I only could gain .1 off my times with slicks, even though i was coming off the line at 6000 rpm, I realized I was pulling the car down out of the powerband after launching - and slowing down until the revs picked up. I put the 4.10's back in, and the car launched HARD w/ 1.5x 60's and an 11.47 @ 120.51 mph. The car picked up .4 by going back to 4.10's and 4mph. The gears helped keep the car in the powerband, attributing to the extra speed.

PS - even with all my mods I got 22mph on the highway a few months ago, cruising at 70mph.

fallstar01 · October 13th, 2005, 05:16 PM

How's the drone?

mdvaldosta · October 13th, 2005, 05:48 PM

I've got alittle, then gears are setup tight though. You should have any noise if setup properly and using FMS.

DILO2001GT · October 14th, 2005, 02:23 AM

yeah i have 4.10s and im trapping at 110 now...

i have a few things i plan on doing like stall converter, cams+P&P my heads,suspension work and possible headers. That was making me thing with better traction and more power I would be hitting the rev limiter alot sooner. I do have a diablosport and will raise it for now and then see what happens after this winter. i mean i love the 4.10s and the way they accelerate the car hard but i didn't want to be spraying into the rev limit. i really need a dyno tune but i might as well wait for that when i get the cams and head work done.

Twist 2 Go · October 14th, 2005, 09:21 AM

I'd get the other mods first and then re-evaluate what gear is needed. In the meantime, just bump the rev limiter by about 200

DILO2001GT · October 14th, 2005, 06:41 PM

yeah thats what im gonna do for now. i haven't driven the car in a week too crappy around here so im waiting til this weekend to take it to the vetter-viper shootout to watch and then maybe away til the spring

Scott2001GT · October 1st, 2008, 11:59 PM

i am doing 4:30's in my auto. N/A though

SWEET2KSTANG · October 2nd, 2008, 01:08 AM

i went from 4.10's to 3.73's. i picked up 2mph and dropped .2 in the 1/4. i was running out of usable power with the 4.10's and i am glad i went to the 3.73.

i just noticed you were an auto, i would personally stay with the 4.10 if i had a set up like yours.

03FstStngKB · October 2nd, 2008, 02:27 AM

*cough cough...blow(ing) off the dust on this thread...lol.

SWEET2KSTANG · October 2nd, 2008, 03:03 AM

damn, i just noticed the date

03FstStngKB · October 2nd, 2008, 03:04 AM

^^^Just think how many gear threads have been made since that date...mods you got a clue...lol?

rwboring · October 2nd, 2008, 09:38 AM

attached is a spread sheet i made... comparing two sets of gears... you can look at the difference in MPH that youll have then at the bottom if you know your torque (or just guess to see the trend) you can see what the torque difference at the wheels will be... i made this when i was getting the gearing for my rear end behind my c-4 but it was easily updated for the 3650 (if you have anything different just change the ratios about 25 cells down)

October 12th, 2005, 11:59 PM	#1
DILO2001GT Regular 2001 GT 11.9 @116 Join Date: Oct 2005 Location: waltham, mass Posts: 357 iTrader: 0 reviews	3.73s or 3.90s? iight im barely getting there but right before i finish maybe a couple car lengths im hitting the rev limiter in the 1320'. i wonder if i should look into 3.73s or if 3.90s will do it. though if i do 3.90s those gears cost more and i don't know if thats a big enough difference from the 4.10s to make me finish right where i want to be. what do you guys think. also mind you that over the winter im adding stage 2 cams, stall converter, P&P my heads, headers and i'll be hooking up better with some suspension mods. thanks!! __________________ 12.04 at 115mph with a 1.9 60'

October 13th, 2005, 03:32 PM	#3
fallstar01 Regular Join Date: Sep 2005 Posts: 184 iTrader: 0 reviews	You've got me thinking now. Do I stick 4.10s in my daily driver boosted mustang? Since I'm trapping at 110 now, I think I could probably do really well with them at the strip. I'd really like to test drive a mustang with 4.10s though. __________________

October 13th, 2005, 05:16 PM	#5
fallstar01 Regular Join Date: Sep 2005 Posts: 184 iTrader: 0 reviews	How's the drone? __________________

October 14th, 2005, 02:23 AM	#7
DILO2001GT Regular 2001 GT 11.9 @116 Join Date: Oct 2005 Location: waltham, mass Posts: 357 iTrader: 0 reviews	yeah i have 4.10s and im trapping at 110 now... i have a few things i plan on doing like stall converter, cams+P&P my heads,suspension work and possible headers. That was making me thing with better traction and more power I would be hitting the rev limiter alot sooner. I do have a diablosport and will raise it for now and then see what happens after this winter. i mean i love the 4.10s and the way they accelerate the car hard but i didn't want to be spraying into the rev limit. i really need a dyno tune but i might as well wait for that when i get the cams and head work done. __________________ 12.04 at 115mph with a 1.9 60'

October 14th, 2005, 09:21 AM	#8
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716 iTrader: 0 reviews	I'd get the other mods first and then re-evaluate what gear is needed. In the meantime, just bump the rev limiter by about 200 __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net

October 13th, 2005, 09:58 AM	#2
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	Im assuming you've got 4.10's now? Don't go lower. I did it, and ended up switching back. Get a taller tire for the track instead, or raise your rev limiter.

October 13th, 2005, 04:35 PM	#4
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	I trapped at 115 with 4.10's hitting the rev limiter for 150 feet and 122mph with 3.73's right at the rev limiter, this is with street tires. Even though I trapped much faster with the 3.73's and hit the limiter with 4.10's, my 1/4 times were identical (11.90's). Once I started running slicks, I ran a best of 11.80 @ 116mph (1.7x 60's) with the 3.73's. Dumbfounded as to why I only could gain .1 off my times with slicks, even though i was coming off the line at 6000 rpm, I realized I was pulling the car down out of the powerband after launching - and slowing down until the revs picked up. I put the 4.10's back in, and the car launched HARD w/ 1.5x 60's and an 11.47 @ 120.51 mph. The car picked up .4 by going back to 4.10's and 4mph. The gears helped keep the car in the powerband, attributing to the extra speed. PS - even with all my mods I got 22mph on the highway a few months ago, cruising at 70mph.

October 13th, 2005, 05:48 PM	#6
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	I've got alittle, then gears are setup tight though. You should have any noise if setup properly and using FMS.

October 14th, 2005, 06:41 PM	#9
DILO2001GT Regular 2001 GT 11.9 @116 Join Date: Oct 2005 Location: waltham, mass Posts: 357 iTrader: 0 reviews	yeah thats what im gonna do for now. i haven't driven the car in a week too crappy around here so im waiting til this weekend to take it to the vetter-viper shootout to watch and then maybe away til the spring __________________ 12.04 at 115mph with a 1.9 60'

October 1st, 2008, 11:59 PM	#10
Scott2001GT BYAHHHH! 2001 Mustang GT 13.874 Join Date: Mar 2008 Location: Missouri Posts: 14,628 Blog Entries: 1 iTrader: 3 reviews	i am doing 4:30's in my auto. N/A though

October 2nd, 2008, 01:08 AM	#11
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	i went from 4.10's to 3.73's. i picked up 2mph and dropped .2 in the 1/4. i was running out of usable power with the 4.10's and i am glad i went to the 3.73. i just noticed you were an auto, i would personally stay with the 4.10 if i had a set up like yours. __________________ project warhorse under construction being built by MP2 Performance

October 2nd, 2008, 02:27 AM	#12
03FstStngKB Regular 2003 Ford Mustang GT After Stall'd>>13.50?? Join Date: Feb 2008 Location: Peoria,IL. Posts: 280 iTrader: 0 reviews	*cough cough...blow(ing) off the dust on this thread...lol. __________________ ^^^^^^^^^My other BaBy!!!^^^^^^^^^ <---Mods List---> 4.30 Gears Installed Mac H-Pipe Installed 40 Series Flowmasters Installed Diablo Predator Tuned Coming soon>>>SCT Tuned J-mod and 3700 Stall >> ET of completion 'Spring or Summer of 09'

October 2nd, 2008, 03:03 AM	#13
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	damn, i just noticed the date __________________ project warhorse under construction being built by MP2 Performance

October 2nd, 2008, 03:04 AM	#14
03FstStngKB Regular 2003 Ford Mustang GT After Stall'd>>13.50?? Join Date: Feb 2008 Location: Peoria,IL. Posts: 280 iTrader: 0 reviews	^^^Just think how many gear threads have been made since that date...mods you got a clue...lol? __________________ ^^^^^^^^^My other BaBy!!!^^^^^^^^^ <---Mods List---> 4.30 Gears Installed Mac H-Pipe Installed 40 Series Flowmasters Installed Diablo Predator Tuned Coming soon>>>SCT Tuned J-mod and 3700 Stall >> ET of completion 'Spring or Summer of 09'

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