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Author Topic: gear selection help.  (Read 4409 times)
angry5.0
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Location: Mooresville,IN

« on: January 25, 2012, 08:28:18 pm »

Hey guys
I have an 89 mustang. It has a 306 stage 1 cam and alot of motor mods...N/A motor and  an AOD trans with 3,000 stall. I do alot of city driving. Would 3.73's be better or maybe 3.55's or 4.10's... And how hard is it to do a gear swap? Im running stock tires..It has stock gears now.I want a gear that will really wake the car up.I don't drag race I do like to get on the car and punch the shit out of it and hammer down sometimes. LOL but seriously what would be suggested?
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James93
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« Reply #1 on: January 25, 2012, 09:31:39 pm »

My first engine(MAC headers, 2800 RPM stalled converter, 70 mm t.b., K&N filter...)absolutely woke up with a 4.30:1 ring and pinion. I drove on the interstate all of the time and used a 27" tall rear tire.

Not a hard installation if you have some experience working on mechanical things. A few tools can usually be rented at the local parts store, minus the press to remove the pinion bearing.
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69 Merc
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« Reply #2 on: January 26, 2012, 09:28:52 am »

While doing gear swaps IIRC there are a few after-measurements that are very important.  Gear lash depth is a biggie.

If you don't mind losing some mpg a high stalling T/C woke my Merc up more so than anything that I ever did to the Merc in the past.  (The 408W monster that it has now would wake up the dead!)
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
85_GT
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« Reply #3 on: January 26, 2012, 10:15:19 am »

after-measurements
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85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
69 Merc
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« Reply #4 on: January 26, 2012, 10:47:13 am »



I guess not the best choice of words -- how about "mesh measurements"?  LOL.
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
95GTspeeddemon
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« Reply #5 on: January 26, 2012, 01:24:38 pm »

i have 4.30's, 70mph / 25in tire / .64 OD im at 2500rpm.
more gear helps with city mpg from what i hear; less load to get going.
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95gt, 302, canfield 195's, canfield efi intake; efi sheetmetal elbow, 331 custom cam, 90mm accufab TB, 1 3/4 accufab LT's, 3in accufab h pipe, 3in magnapacks, 4.30's, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600. 12.9 @ 115 2.0 60' 1300DA
69 Merc
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Location: OC, CA

« Reply #6 on: January 26, 2012, 01:29:30 pm »

With more gear your engine is spinning higher which I've found equates to less mpg.
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
69 Merc
The Ricer King
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Location: OC, CA

« Reply #7 on: January 26, 2012, 01:33:43 pm »

IOW your launch is easier on your engine true because better gears offer more of a torque advantage but when cruising your engine will be turning faster ...
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
95GTspeeddemon
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« Reply #8 on: January 26, 2012, 01:35:21 pm »

With more gear your engine is spinning higher which I've found equates to less mpg.
its about load.
more to get going, but less rpm = best highway
less to get going, but more rpm= better city
55mph is only 2k for me, thats not much at all. 3.27's were like 1500rpm or so.
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95gt, 302, canfield 195's, canfield efi intake; efi sheetmetal elbow, 331 custom cam, 90mm accufab TB, 1 3/4 accufab LT's, 3in accufab h pipe, 3in magnapacks, 4.30's, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600. 12.9 @ 115 2.0 60' 1300DA
juiced coupe
Six figures worth of don't give a f*ck
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The land mass between New Orleans and Mobile


« Reply #9 on: January 26, 2012, 01:36:55 pm »

more gear helps with city mpg from what i hear; less load to get going.

Thats been my experience with trucks. Never paid much attention with cars, because I wasn't worried about mileage.
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Just a 12 second car with a 11 second engine.....that runs 10s
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor
85_GT
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« Reply #10 on: January 26, 2012, 01:40:14 pm »

With more gear your engine is spinning higher which I've found equates to less mpg.
its about load.
more to get going, but less rpm = best highway
less to get going, but more rpm= better city
55mph is only 2k for me, thats not much at all. 3.27's were like 1500rpm or so.
^^ +1
That's the same case for us in the heavy cars in the caprice/impala world.  Not the light weights like Roberts Wink
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85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
69 Merc
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Big Block
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Location: OC, CA

« Reply #11 on: January 26, 2012, 01:44:05 pm »

I guess that after switching from 3.00 to 4.56 with a 3 speed you might see it my way -- driving in the city and heaven forbid if you flew down the highway as far as which eats gas more ...

Overkill?      Spt at PC
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
85_GT
Big Block
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« Reply #12 on: January 26, 2012, 01:57:20 pm »

It's that inefficient 5000 TC doing it to you...
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85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
69 Merc
The Ricer King
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 13370


Location: OC, CA

« Reply #13 on: January 26, 2012, 02:09:00 pm »

With more gear your engine is spinning higher which I've found equates to less mpg.
its about load.
more to get going, but less rpm = best highway
less to get going, but more rpm= better city
55mph is only 2k for me, thats not much at all. 3.27's were like 1500rpm or so.


I guess it depends on how far you cruise when you are doing your city driving?

I was just saying that 500rpm more so than before will eat gas faster, right?
Logged

Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
69 Merc
The Ricer King
Adv_SBFTechie
Big Block
****
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Posts: 13370


Location: OC, CA

« Reply #14 on: January 26, 2012, 02:15:32 pm »

So you are saying that the city red lights launch hurts the mpg that badly compared to a higher cruise rpm mpg killer?
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
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