Gears Gears Gears

Skyman · 03-10-2001, 06:34 AM

Well I used the calculator on here to discover that I have 4.10 gears! The guy that sold it to me said I had 3.73. But at 70mph I tacked 2850rpm with a 23.5" tire so that comes out to 4.10's.

All this time I thought I had 3.73's.. Wow I'm never going to recommend to anyone anything less than 3.73 now. My 4.10's aren't that bad at all. If I was to do it myself I think I'd go with 4.30's.

Sky

------------------
-1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's.
0-110MPH In car view (963k)
All Throttle through 3 gears! (497k)
<A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

Rick 91GT · 03-10-2001, 09:29 AM

Hey Sky, the best way to tell what gears you have is to jack the rear of the car up, put a mark on the drive shaft and a mark on the tire, turn the tire 1 revolution and count how many times the drive shaft goes around. That is more accurate then the calculators. The smaller diameter tire will make the 3:73's act like a 4:10 gear, hate to burst your bubble. The gear ratio is based on a 26" tall tire I beleive.

Rick

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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

Skyman · 03-10-2001, 04:16 PM

Yeah, I know I figure I'm going to do that just to make sure, but I figured in a 23.5" tire when I calculated it.

Skyler

------------------
-1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's.
0-110MPH In car view (963k)
All Throttle through 3 gears! (497k)
<A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

cojonepony · 03-11-2001, 12:32 PM

If they're FMS gears the ratio is marked on the head of the pinion. Of course this would involve taking the cover off the diff and draining and re-filling, but its worth a try!

BTW: Another method is to count the ring gear teeth and divide this number by the number of pinion gear teeth. This is the most cut-and-dry foolproof method I can think of.

NO SLO PK · 03-11-2001, 01:49 PM

Hey Sky, if you're going off the factory tach, I believe they usually read a little high.

See you on the 24th???

------------------
'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

Skyman · 03-11-2001, 09:10 PM

Well I have a 10k Monster tach. So thats not it. I think I just have 4.10's. Ill check it for sure soon.

24th...

Sky

------------------
-1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's.
0-110MPH In car view (963k)
All Throttle through 3 gears! (497k)
<A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

BowTie Eater 5 Liter · 03-11-2001, 11:39 PM

Sky, U still gona build a 351?
Im Gona, If U want a 400hp 450ft.-lbs torque motor 351, e-ail Me & ill send you the article. the whole motor costs 4000
botieeater5liter@yahoo.ca

------------------
1988 Mustang GT, T-5
No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe (Sounds Mean), K&N Air Filter (Stock Air Box, Removed air silendcer), 198.9 rwhp @4200 (235 Motor!!), 285 lbs-ft @2900 (336 Motor!!!).
My Stang This Is What Dynomax Ultra-Flo's Do

03-10-2001, 06:34 AM	#1
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Gears Gears Gears Well I used the calculator on here to discover that I have 4.10 gears! The guy that sold it to me said I had 3.73. But at 70mph I tacked 2850rpm with a 23.5" tire so that comes out to 4.10's. All this time I thought I had 3.73's.. Wow I'm never going to recommend to anyone anything less than 3.73 now. My 4.10's aren't that bad at all. If I was to do it myself I think I'd go with 4.30's. Sky ------------------ -1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's. 0-110MPH In car view (963k) All Throttle through 3 gears! (497k) <A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

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03-10-2001, 09:29 AM	#2
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	Hey Sky, the best way to tell what gears you have is to jack the rear of the car up, put a mark on the drive shaft and a mark on the tire, turn the tire 1 revolution and count how many times the drive shaft goes around. That is more accurate then the calculators. The smaller diameter tire will make the 3:73's act like a 4:10 gear, hate to burst your bubble. The gear ratio is based on a 26" tall tire I beleive. Rick ------------------ My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

03-10-2001, 04:16 PM	#3
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Yeah, I know I figure I'm going to do that just to make sure, but I figured in a 23.5" tire when I calculated it. Skyler ------------------ -1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's. 0-110MPH In car view (963k) All Throttle through 3 gears! (497k) <A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

03-11-2001, 12:32 PM	#4
cojonepony Registered Member Join Date: Feb 2000 Posts: 132	If they're FMS gears the ratio is marked on the head of the pinion. Of course this would involve taking the cover off the diff and draining and re-filling, but its worth a try! BTW: Another method is to count the ring gear teeth and divide this number by the number of pinion gear teeth. This is the most cut-and-dry foolproof method I can think of.

03-11-2001, 01:49 PM	#5
NO SLO PK Registered Member Join Date: Mar 1999 Location: Arcadia, CA, USA Posts: 731	Hey Sky, if you're going off the factory tach, I believe they usually read a little high. See you on the 24th??? ------------------ '91 LX Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

03-11-2001, 09:10 PM	#6
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Well I have a 10k Monster tach. So thats not it. I think I just have 4.10's. Ill check it for sure soon. 24th... Sky ------------------ -1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more. Added Eibach drag launch springs and 70/30's w/ 50/50's. 0-110MPH In car view (963k) All Throttle through 3 gears! (497k) <A HREF="http://members.aol.com/lskymanl/burnout.mpg" TARGET=_b

03-11-2001, 11:39 PM	#7
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	Sky, U still gona build a 351? Im Gona, If U want a 400hp 450ft.-lbs torque motor 351, e-ail Me & ill send you the article. the whole motor costs 4000 botieeater5liter@yahoo.ca ------------------ 1988 Mustang GT, T-5 No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe (Sounds Mean), K&N Air Filter (Stock Air Box, Removed air silendcer), 198.9 rwhp @4200 (235 Motor!!), 285 lbs-ft @2900 (336 Motor!!!). My Stang This Is What Dynomax Ultra-Flo's Do