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post #1 of 11 (permalink) Old 10-10-2006, 06:50 PM Thread Starter
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gains from manual swap?

I have heard of people gaining like 20-40HP from a manual swap. Is this true or just what they feel? I am thinking of doing a 5 or 6 speed swap but I have no $ at the time. I looked into it and the t45 t56 t6 and the m5r2 are the only manuals that can be used on a 4.6? And the last question is it I were to get a junkyard trans out of a mustaang would it need to be rebuilt? My power goal is 300 rwhp.

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post #2 of 11 (permalink) Old 10-10-2006, 07:01 PM
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Automatics rob power.

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post #3 of 11 (permalink) Old 10-10-2006, 08:41 PM Thread Starter
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Quote:
Originally Posted by warmaster259
Automatics rob power.
any idea on how much %?

1996 sport 4.6 130k and still strong.
1991 SC 3.8 project and toy.
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post #4 of 11 (permalink) Old 10-11-2006, 02:10 AM
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A manual may show a slight gain on the dyno, but you'll probably, at best, see the same times down the 1/4 as with the automatic.. You just can't shift as fast as a properly done automatic. The fun factor with the manual, however, is right up there. I'm not entirely sure how stout the T45 is.. but you may be pushing it's capablities with 300rwhp. The M5R2 might be slightly better.. but it's often called a truck transmission. the 3550/3560 or TKO might be where you need to look with those power goals.

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post #5 of 11 (permalink) Old 10-11-2006, 01:12 PM
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Quote:
Originally Posted by ncoop23
any idea on how much %?
17% I think, but I'm stoopid; Don't take my word for it.

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post #6 of 11 (permalink) Old 10-11-2006, 02:01 PM
 
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They don't make adaptor bell housings to fit a t5 to a 4.6? You could build one of those cheap that would probably handle 300 hp no problem.
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post #7 of 11 (permalink) Old 10-11-2006, 02:05 PM
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Quote:
Originally Posted by ncoop23
any idea on how much %?
The difference is about 7%. But with a properly built auto and the right converter and gearing you will definitely be faster.
It isn't that you are gaining horsepower with a manual, so please don't think that.

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post #8 of 11 (permalink) Old 10-11-2006, 02:25 PM
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Well if you have an auto and switch to a stick you will free up some hp that was lost in the auto trans so you could look at it that you gained back some hp.

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post #9 of 11 (permalink) Old 10-11-2006, 02:46 PM
 
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Below 300 hp, I think a manual swap would be better than a stock AODE 4r70w at the strip with a good driver and very sticky tires. Above a certain power level, manuals just are hard to handle on the strip unless you have the perfect setup.

Like Darrin said, if you replace the converter and strengthen the tranny, I'd bet the auto would beat the manual in most cases in the 1/4 mile.

Road racing and street fun is a different story.
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post #10 of 11 (permalink) Old 10-13-2006, 04:54 PM Thread Starter
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I am just looking to have lots of fun I really don't care about ET's.

also with a manual I can have a faster final gear.

1996 sport 4.6 130k and still strong.
1991 SC 3.8 project and toy.
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post #11 of 11 (permalink) Old 10-13-2006, 05:02 PM
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Quote:
Originally Posted by ncoop23
I have heard of people gaining like 20-40HP from a manual swap. Is this true or just what they feel? I am thinking of doing a 5 or 6 speed swap but I have no $ at the time. I looked into it and the t45 t56 t6 and the m5r2 are the only manuals that can be used on a 4.6? And the last question is it I were to get a junkyard trans out of a mustaang would it need to be rebuilt? My power goal is 300 rwhp.

if you honestly want a solid T45 and pick a used one up cheap, Jeff at nitrostangracing.com rebuilds them and could probably do a slightly custom gearset for it.
http://www.nitrostangracing.com/PMT45.html




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