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Author
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Topic: tranny
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bill haab
Gearhead Posts: 143
From: south bend in.
Registered: Oct 2002
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posted 10-05-2003 09:47 AM
   
ok guys i have a 66 fastback. With 289 all rebuilt with a paxton supercharger. all new skins on the whole car roll cage 6 point.smiths radiator moser rear end 457 gears. im putting this car together this winter. Ok here is the ? I think I want a 6 speed tranny. I will be running on the street & going to strip once a month. what tranny should I buy. Plus I'm want to buy new.
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bill haab
Gearhead Posts: 143
From: south bend in.
Registered: Oct 2002
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posted 10-06-2003 10:35 PM
A little advice would be helpful. thanks
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steve'66
Gearhead Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-06-2003 11:39 PM
Bill,I think the 6 speed or even a 5 speed has too low a 1st gear w/4.56 gearing.  Maybe a 5 speed with 4.10 rear would be ok, but even then the launch ratio is too low. You'll be shifting to second in less than a second.  The 5 or 6 speed would be good with a 3.89/3.90 rear and then you'll only need the 6 speed if you want to try for the 180mph mark. SteveW
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Tea'sGrabber
Gearhead Posts: 189
From: Seattle, Wash.
Registered: Feb 2003
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posted 10-07-2003 01:35 PM
ditto....66!!------------------
Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.
http://mustangsandmore.50megs.com/MembersPics/TeasGrabber.html
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bill haab
Gearhead Posts: 143
From: south bend in.
Registered: Oct 2002
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posted 10-07-2003 06:00 PM
moser told me they did not have a 456 gearing. only 457. this was before the plane story happened.
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CHIPSBAD67
Journeyman Posts: 71
From: LOU,KY;USA
Registered: Sep 2003
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posted 10-07-2003 07:59 PM
to much rear gear hurts worse than not enough. with the blower i dont think torque will be a problem. id go tkoII and 3:80's.------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
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kid vishus
Gearhead Posts: 4736
From: middle of NC
Registered: Oct 2000
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posted 10-08-2003 08:18 AM
I agree, too much total low gear ratio. A buddy of mine was running a 4.71 gear in his mustang, and using a Jerico 4 speed with a 3.08 first gear. It was too low, he was shifting into second before he got to the tree. He had to go to a 4.11 gear to kill some total low gear ratio. A 5 speed with your current rear gear ratio would be like trying to hi speed take off in a truck with a granny low 4 speed. I suppose you could get a 5 speed with a custom gear ratios in it to compensate for the low rear gear.
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mvierow
Gearhead Posts: 199
From: Bay Area, Ca
Registered: Apr 2001
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posted 10-08-2003 02:47 PM
Bill, I'd give Dark Horse performance a call. They can build you up a custom geared 5 speed that will be able to handle the torque your putting down. The size of the 6 speed makes installation a pain, and will require you to cut/modify the tunnel inorder to fit it all under there.http://www.darkhorseperformance.com
http://www.darkhorseperformance.com/acatalog/3550_TKO_Crossmembers_and_Parts.html
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bill haab
Gearhead Posts: 143
From: south bend in.
Registered: Oct 2002
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posted 10-08-2003 07:15 PM
thank's guy's i'm talking to dark horse today !
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Mark T 7724
Journeyman Posts: 86
From: Palmdale, CA
Registered: Nov 2000
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posted 10-09-2003 01:34 AM
I disagree with you KV it depends on what motor you run, I run a 3.25 low gear in a Jerico with 6.00 gears. So it depends on how high your motor makes power. So it is all what you want to do with your car, Street or Track. By the way I hit second in the "Air"
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