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Author
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Topic: What rear axle ratio are you using with your T5 ?
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Pierre
Gearhead Posts: 541
From: Near Paris, France
Registered: Apr 2002
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posted 01-19-2004 02:05 AM
   
When moving from C4 to T5 I installed a 3.5 ratio with a "Z" type T5 (1st: 2.95 - 2nd: 1.94 - 3rd: 1.34 - 4th: 1 - 5th: 0.63)That 0.63 5th gear is sssso long that by the time I reach the bottom of the 270S camshaft confort zone, I am already above 75mph (max freeway speed here  ). So I was thinking of increasing ratio to 3.7 or 3.89 (4.11 seem a little too high !) and by the same token get better acceleration from 1st to 4th. (+ the double pumper should like that too !) What are you, street T5 owners, using for ratio ?
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V8 Thumper
Gearhead Posts: 4376
From: Arizona
Registered: Dec 2001
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posted 01-19-2004 08:42 AM
I'm not running a T-5, but with 3.89's that thing would launch  Your final 1st gear ratio as it is now: 10.325:1 (with 3.70 gears and 2.78 1st I'm at 10.286). With 3.89's you'd be at 11.45:1  No way street radials will hook up  I've got a spare 9" case that I'm going to build for dragstrip use only. Spooled and geared about 5.29-5.83
That puts my low gear final drive ratio about 16.2:1 ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html [This message has been edited by V8 Thumper (edited 01-19-2004).]
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V8 Thumper
Gearhead Posts: 4376
From: Arizona
Registered: Dec 2001
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posted 01-19-2004 08:57 AM
At the strip (1/4 mile), I could be going through the lights at over 8200 rpm ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Pierre
Gearhead Posts: 541
From: Near Paris, France
Registered: Apr 2002
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posted 01-19-2004 09:12 AM
quote:
Originally posted by V8 Thumper:
I'm not running a T-5, but with 3.89's that thing would [b]launch Your final 1st gear ratio as it is now: 10.325:1 (with 3.70 gears and 2.78 1st I'm at 10.286). With 3.89's you'd be at 11.45:1 No way street radials will hook up I've got a spare 9" case that I'm going to build for dragstrip use only. Spooled and geared about 5.29-5.83
That puts my low gear final drive ratio about 16.2:1 [/B]
I figured that my first gear would be a little on the short end  Forgive my na?ve approach, I haven't done much homework on this topic but would 3.7 still be overkill ? ....Don't forget that I don't have the same mid-range torque as you do & my engine only puts out 330-340 max HP
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SlowFord
Journeyman Posts: 31
From: So. Cal
Registered: Dec 2001
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posted 01-19-2004 01:57 PM
I have 3.70 gears in my 1963 Falcon Ranchero with a 302 and a T-5. The T-5 is from a 1988 Mustang, which has 3.35 first gear. I think the 3.70's are a great street ratio.
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kcode
Gearhead Posts: 3019
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 01-19-2004 07:20 PM
With a T-5Z, 3.89 to 1 would be a good all around gear. I have a 3.35 first gear with 3.89 rear behind a 347 in my 65. First gear is alittle short, but fun. The .68 OD makes cruising at 2300 rpm on the interstates at 65 mph.------------------
Mike Golliver
MCA Gold Card Judge-Modifieds
65 Kcode coupe 347 stroker modified 5-speed MCA Retired
66 convertible-3 dueces and a 5-speed with a 289
89 T-Bird Super coupe
01 Mustang GT Convt
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V8 Thumper
Gearhead Posts: 4376
From: Arizona
Registered: Dec 2001
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posted 01-19-2004 10:29 PM
Pierre, if you've got 3.50's in it now, 3.70's wouldn't get you much more than 150 rpm, or even less. Not much! Going to 3.89's would get you closer to a 300 rpm jump, and that's more worth the $200+ you're likely to spend. ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Pierre
Gearhead Posts: 541
From: Near Paris, France
Registered: Apr 2002
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posted 01-20-2004 04:03 AM
Thanks to all of you guys for these great inputs, I will then be going to a 3.89 I didn't find anyone here who knew how to install this thing  I got the same "don't venture on this path" from every one at the MCF (Mustang Club of France).....sounds like I'll be the first one
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bibbs68
Gearhead Posts: 1588
From: Jackson, TN
Registered: Sep 2000
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posted 01-20-2004 11:13 AM
Pierre, you are ahead of me on this question. I am now finishing my T5 (3.35 1st gear) install. Unfortunately new gears (3.50) are out of my budget right now. I have stock 2.79 rear gears so I'll be granny driving for who knows how long.  [This message has been edited by bibbs68 (edited 01-20-2004).]
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 01-20-2004 05:50 PM
With my driving style I think I will probably be scaling back from my 4.11 to a 3.55 or so when I put my D&D converted 2.95 T-5 in. I might keep the 4.11 just for fun, especially when I put my soon-to-be built 302 roller in. Maybe after I drive it with the 4.11, I'll let you know what I think. The 4.11 is a bit high with my current T-10 4spd and highway driving... 
Daniel
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 01-20-2004 05:51 PM
Oh, with my new E cam, I might need to keep the 4.11. 
Daniel
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bill haab
Gearhead Posts: 431
From: south bend in.
Registered: Oct 2002
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posted 01-20-2004 07:35 PM
well I bought my car a year in a half ago. and replaced everything. but I have a t56 with 456 gears. soon I'll give some feed back.
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HHStang
Gearhead Posts: 372
From: SC, USA
Registered: Feb 2003
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posted 01-20-2004 09:26 PM
how tall are your tires? I have 32" tall and it makes a big difference in what gears you should have.------------------
[URL=http://www.mikemustangs.net 1967]www.mikemustangs.net 1967 429 Prost FBstang
1997 Cobra vert Vortech
2003 F150 4x4 Crew
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Tom G
Gearhead Posts: 573
From: Bethlehem, Pa USA
Registered: Nov 2001
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posted 01-20-2004 09:49 PM
4.11's are alot of fun. Especially if your motor likes some xtra rpms. I have a 4.11 spooled 9" currently and a 3.25 with trac loc that is being switched to a 3.89 with a fresh trac loc. 5 speeds are great you can run plenty of gear and have decent mileage too. Or is that decent mileage and EAT CHEVIES TOO? ------------------
67 Mustang F/B 302 GT-40X FMS Crate engine 5 spd cable clutch 13.39 on 205/70/14 BFG @104 mph Flowmasters X Pipe 4.11 9". BIG Body shop NOW! 03 Focus ZX3 BORLA exhaust Wings West spoiler (Arrest ME RED)
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 01-21-2004 11:15 AM
I hate eating Chebbies--they taste like... Blechhhh!!! :P But, if that's all that's available...
Daniel
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John Z
Gearhead Posts: 390
From: Morgantown, WV
Registered: Jul 99
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posted 01-21-2004 12:14 PM
I have 3.55 with a '88 T5 and it is great for me. To me first gear is a little short for street driving but fifth is great for cruising.
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Pierre
Gearhead Posts: 541
From: Near Paris, France
Registered: Apr 2002
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posted 01-21-2004 12:37 PM
I read all of you guys post and get all excited on how much faster I could make my car go (4.11 does seem almost tempting now)........then I drive by a gas station and see the 1.1euro-per-liter sign glowing (5.30$ per gallon!!) and I drive home all depressed Price of a social system that used to be great I guess
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Tom G
Gearhead Posts: 573
From: Bethlehem, Pa USA
Registered: Nov 2001
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posted 01-23-2004 11:08 PM
quote:
Originally posted by Pierre:
I read all of you guys post and get all excited on how much faster I could make my car go (4.11 does seem almost tempting now)........then I drive by a gas station and see the 1.1euro-per-liter sign glowing (5.30$ per gallon!!) and I drive home all depressed Price of a social system that used to be great I guess
It has been a few years since I was last in Europe with the US Military and even then the price of fuel was outrageous. I shouldn't have tempted you with the comments about the 4.11's sorry!------------------
67 Mustang Shelby clone F/B 302 GT-40X FMS Crate engine 5 spd cable clutch 13.39 on 205/70/14 BFG @104 mph Flowmasters X Pipe 4.11 9". BIG Body shop NOW! 03 Focus ZX3 BORLA exhaust Wings West spoiler (Arrest ME RED)
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ccode67
Gearhead Posts: 2645
From: douglasville,ga,usa
Registered: Mar 2001
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posted 01-26-2004 08:50 AM
I currently have a 3.70 in mine, it really picked it up over the 3.50, my next project is a 3.89 with a Detroit Locker (absolutely NO RICHMOND gears). I'll put the 2.79 back in before I'll pay for another set of Richmond gears.  3.89 should be perfect with the overdrive. ------------------
Stuart
MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package my photo page
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Pierre
Gearhead Posts: 541
From: Near Paris, France
Registered: Apr 2002
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posted 01-26-2004 09:13 AM
quote:
Originally posted by ccode67:
(absolutely NO RICHMOND gears). I'll put the 2.79 back in before I'll pay for another set of Richmond gears.
Why not Richmond ? I was planning on getting it from these guys as they seem to be one of the main vendors
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ccode67
Gearhead Posts: 2645
From: douglasville,ga,usa
Registered: Mar 2001
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posted 01-26-2004 12:25 PM
Richmond gears are crap, new set with new bearings, properly set up and broken in (richmonds instructions) lasted about 1200 miles before the whine started, by the time I was back home (3500 miles total) I was wondering if it would stay together at all.
When I removed it the housing was FULL of metal shavings, looks like the gear wasn't heat treated properly.
I was warned by the rear end guy, but already had the gear set. Motive gears were recommended.------------------
Stuart
MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package my photo page
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