another gear question

JamGtStang · 04-11-2001, 09:57 AM

I have a 1990 GT and i dont plan to put a supercharge or a stroker engine its going to stay pretty much stock (to many tickets already) the question is 3:73 or 3:55 lots of people say 3:73 but i just one another opinion

thanks in advance

04-11-2001, 12:24 PM

I would say 3.73's all the way, maybe even 4.10's if youre going to leave it mostly stock other than that and you dont care much about mileage.... I cant see 3.55's making that big of a difference.

Smokedawg · 04-11-2001, 12:32 PM

Its ALL goin to depend on how much you drive the stang. Is it your daily driver? If so 3:55's will make a difference and less costly on gas. They made a great difference in my 90 stang. 3:73's If you drive it just cruising and a occasional race. But if you want this to just be your little warrior go with the 4:10's.

------------------
347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors

JamGtStang · 04-11-2001, 02:08 PM

thanks for ur replies guys i think i'm going to go with 3:73 is that true that it will consume more gas!!! if so ..... dammmnnnnnnnnnnnn!!!!!!!!

Smokedawg · 04-11-2001, 02:14 PM

Yes, Goin to a bigger gear will cause less gas milage. Because it will be running at a higher RPM. So say with your stock gears now in OD going approx 65 you will be at 1500RPM. Now with new gears going 65 in OD may cause u to be at 3000RPM

------------------
347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors

Chevyguy · 04-11-2001, 04:05 PM

I drive 45 miles each way to work, the stock 2.73's give me great gas mileage, but obviously slow me down. I have been wondering between 3.55's and 3.23's Even 3.08's would be nicer, but not worth the cost to swap over.

I'm gonna drive my buddys 89 with 3.55's to get a feel for the swap, my 74 has 3.42's but also has 28" tall 275/60-15's out back.

------------------
Frank W
90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch
88 Notch 2.3L 5 speed Parts/beater car

74 Chevy Laguna Type S-3 305 fixing soon, getting a 454 to put in garage
www.chevellepages.com/folingo

JamGtStang · 04-11-2001, 04:38 PM

I was really pleased with my 3:08's but my best friend just got a 2001 GT and We havent race yet but that they will come and I dont want to see no 2001 Xmas tree in front of me if u know what i mean

MTU 50 · 04-11-2001, 06:50 PM

Since you are planning on keeping your motor pretty much stock, go with a minimum of a 3.73! Go with at least 3.73 Especially if you if have an AOD and seriously consider 4.10's.

If you have a manual and are going to keep it relatively stock go with 3.73.

My car with the AOD and 3.73's gets 25.5 MPG on the highway at 75 MPH and about 27 MPG on the highway at about 60 MPH.

Since the 5-speed has a 5th gear(overdrive) ratio of 0.68 and the AOD's overdrive ratio is 0.67 I would expect you to get very similar MPG at constant highway speeds. Around town it would be a little different, but it shouldn't hurt you that bad.

Bottom line, it's WORTH IT to get 3.73's!

------------------
1991 GT, AOD, Moroso Cold Air, 3.73s, Pulleys, 3-chamber(the left one fell off-NO time+No Money=College), FMS c-springs, and KYBs

JamGtStang · 04-12-2001, 08:28 AM

thank u very much guys for all ur replies tomorrow i'm getting (finally) what do u guys think 3:73 u got that right they are charging me $395 with the speedo gear some people say that the speedo for the 3:73 is not 100% accurate like the 3:55 is. Is that true?

thanks

StreetStang37 · 04-12-2001, 02:42 PM

Im getting mine done next week or the week after for $420. I shopped around and they wanted $700++ at The Mustang Ranch and $1,300 at Speed Merchant!! All the ricers go there and some domestics. They really ram you on the prices there, atleast in labor. For them to put in a tach they say at the very least $200 in labor.

------------------
1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, Super Competition Hooker Headers, 2 1/2 in. mandrel bent cat back, High Flow H-Pipe, Pro 5.0 Shifter, 16* Timing Advance

04-11-2001, 09:57 AM	#1
JamGtStang Registered Member Join Date: Dec 2000 Location: Miami, Fl Posts: 58	another gear question I have a 1990 GT and i dont plan to put a supercharge or a stroker engine its going to stay pretty much stock (to many tickets already) the question is 3:73 or 3:55 lots of people say 3:73 but i just one another opinion thanks in advance

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04-11-2001, 12:24 PM	#2
Big&bad89rag Guest Posts: n/a	I would say 3.73's all the way, maybe even 4.10's if youre going to leave it mostly stock other than that and you dont care much about mileage.... I cant see 3.55's making that big of a difference.

04-11-2001, 12:32 PM	#3
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Its ALL goin to depend on how much you drive the stang. Is it your daily driver? If so 3:55's will make a difference and less costly on gas. They made a great difference in my 90 stang. 3:73's If you drive it just cruising and a occasional race. But if you want this to just be your little warrior go with the 4:10's. ------------------ 347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors

04-11-2001, 02:08 PM	#4
JamGtStang Registered Member Join Date: Dec 2000 Location: Miami, Fl Posts: 58	thanks for ur replies guys i think i'm going to go with 3:73 is that true that it will consume more gas!!! if so ..... dammmnnnnnnnnnnnn!!!!!!!!

04-11-2001, 02:14 PM	#5
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Yes, Goin to a bigger gear will cause less gas milage. Because it will be running at a higher RPM. So say with your stock gears now in OD going approx 65 you will be at 1500RPM. Now with new gears going 65 in OD may cause u to be at 3000RPM ------------------ 347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors

04-11-2001, 04:05 PM	#6
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	I drive 45 miles each way to work, the stock 2.73's give me great gas mileage, but obviously slow me down. I have been wondering between 3.55's and 3.23's Even 3.08's would be nicer, but not worth the cost to swap over. I'm gonna drive my buddys 89 with 3.55's to get a feel for the swap, my 74 has 3.42's but also has 28" tall 275/60-15's out back. ------------------ Frank W 90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch 88 Notch 2.3L 5 speed Parts/beater car 74 Chevy Laguna Type S-3 305 fixing soon, getting a 454 to put in garage www.chevellepages.com/folingo

04-11-2001, 04:38 PM	#7
JamGtStang Registered Member Join Date: Dec 2000 Location: Miami, Fl Posts: 58	I was really pleased with my 3:08's but my best friend just got a 2001 GT and We havent race yet but that they will come and I dont want to see no 2001 Xmas tree in front of me if u know what i mean

04-11-2001, 06:50 PM	#8
MTU 50 GOT TORQUE ???? Join Date: Aug 1999 Location: New Hudson, Michigan, USA Posts: 689	Since you are planning on keeping your motor pretty much stock, go with a minimum of a 3.73! Go with at least 3.73 Especially if you if have an AOD and seriously consider 4.10's. If you have a manual and are going to keep it relatively stock go with 3.73. My car with the AOD and 3.73's gets 25.5 MPG on the highway at 75 MPH and about 27 MPG on the highway at about 60 MPH. Since the 5-speed has a 5th gear(overdrive) ratio of 0.68 and the AOD's overdrive ratio is 0.67 I would expect you to get very similar MPG at constant highway speeds. Around town it would be a little different, but it shouldn't hurt you that bad. Bottom line, it's WORTH IT to get 3.73's! ------------------ 1991 GT, AOD, Moroso Cold Air, 3.73s, Pulleys, 3-chamber(the left one fell off-NO time+No Money=College), FMS c-springs, and KYBs

04-12-2001, 08:28 AM	#9
JamGtStang Registered Member Join Date: Dec 2000 Location: Miami, Fl Posts: 58	thank u very much guys for all ur replies tomorrow i'm getting (finally) what do u guys think 3:73 u got that right they are charging me $395 with the speedo gear some people say that the speedo for the 3:73 is not 100% accurate like the 3:55 is. Is that true? thanks

04-12-2001, 02:42 PM	#10
StreetStang37 Registered Member Join Date: Dec 2000 Location: San Jose, California USA Posts: 275	Im getting mine done next week or the week after for $420. I shopped around and they wanted $700++ at The Mustang Ranch and $1,300 at Speed Merchant!! All the ricers go there and some domestics. They really ram you on the prices there, atleast in labor. For them to put in a tach they say at the very least $200 in labor. ------------------ 1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, Super Competition Hooker Headers, 2 1/2 in. mandrel bent cat back, High Flow H-Pipe, Pro 5.0 Shifter, 16* Timing Advance