Anything else? Re: Replacing manual transmission with automatic in 2001 Mustang GT

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stangg01

New Member

Mar 17, 2006

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Apr 20, 2006

#1

• Apr 20, 2006

• #1

I'm replacing my 5spd manual transmission(TR3650) with an automatic(4R70W) in my 2001 Mustang GT. To accomplish this I believe I need the following:

1) To replace my EEC(car computer) with one from an automatic. Catch codes NUX1 or NUX2.
2) A 4R70W transmission complete with wire harness, dip stick tube, new slip yoke(automatics are different from manuals), and shifter assembly.
3) Transmission rebuilt with a quality rebuild kit including Alto Red Eagle clutches, new servos, bands, etc..
4) Torque converter with 300-500 higher than stock stall speed. I plan to keep my rear gears stock ratio because gas milage matters.
5) TransGo shift kit
6) B&M transmission cooler rated at 38,000 GVW
7) Predator Tunes (after 500 miles break-in) to adjust shifting to my preferences.

Anything else???

 

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46gtsblown

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Jan 9, 2002

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Apr 20, 2006

#2

• Apr 20, 2006

• #2

Just one Q why?
You refer to gas milage well manual trans are more efficent than auto's.
Just my preference I know but there you go.
Dwayne

 

sgarlic

Founding Member

Apr 21, 2001

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Apr 20, 2006

#3

• Apr 20, 2006

• #3

As I always say, there's nothing sicker than an auto with a shift kit and a stall.. except a twin turbo auto with a shift kit and a stall.

 

hognutz

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Nov 12, 2002

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albany, oregon

Apr 20, 2006

#4

• Apr 20, 2006

• #4

I have no idea why you sould keep 3.27's with an auto and a stall.

you just want a slower car than you have now? first on that tranny is 2.84 and overdrive is still .7 you could easily run 3.73's without taking real big milage hit. I mean the tranny you have now has a 3.38 first gear so it is going to be hard to come out of the hole as hard IMO you need a lower gear ratio in the rear.

 

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stangg01

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Mar 17, 2006

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Apr 20, 2006

#5

• Apr 20, 2006

• #5

The reasons for the swap are many. Some of the bigger ones are:
I love shifting most of the time, but after working 10 hours then driving in heavy traffic, isn't fun.
My current transmission needs to be rebuilt($1,000 for the rebuild kit delivered).
A swap to a TKO will cost about the same as a swap to an auto.

I am considering switching my rear gears with 3.73 but it may be awhile. From other threads I got the impression that a higher stall would compensate a little for the smaller 1st gear(2.84).

 

hognutz

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Nov 12, 2002

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Apr 20, 2006

#6

• Apr 20, 2006

• #6

okay as long as 1/4 mile time is not the reason for the swap I say go for it. I know what you mean about stop and go. it blows in a stick sometimes. then again that is why I am still a hillbilly. I hate traffic and sometimes people in general. ha ha.

I was just trying to point out that even with the stall you may take a bit of a performance hit. stall help you get up in the r's quicker but the rear gear will help with that. I just know stock vs stock the 5 speed felt stronger than the auto by a good margin but with gears and stall you could proably spank a stock 5 speed.

 

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stangg01

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Mar 17, 2006

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Apr 20, 2006

#7

• Apr 20, 2006

• #7

thanks guys
your input is welcome

 

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007

Founding Member

Jan 29, 2002

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Broke

Apr 20, 2006

#8

• Apr 20, 2006

• #8

Anything less than 4.10s on an NA 4r70w is lame.

 

jivepepper

Founding Member

Jun 19, 2002

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Under a Sombrero. in WV.

Apr 20, 2006

#9

• Apr 20, 2006

• #9

isn't there a tranny cooler you need?

 

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nic01scgt

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Jul 6, 2005

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Saint Louis

Apr 20, 2006

#10

• Apr 20, 2006

• #10

#6

I'm actually looking to do the opposite swap.

 

propellerhead

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Apr 13, 2004

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"but what's with the but shots?"

Apr 21, 2006

#11

• Apr 21, 2006

• #11

People wanting to swap a 5-spd for an auto and auto for a 5-spd are more common than I thought. If you're in the Dallas Texas area, I know of a friend who wants a 5-spd in his auto. You could both save a lot.