Forums at Modded Mustangs
Home Register FAQ Members List Calendar Blogs Timeslips Garage Gallery Search Today's Posts Mark Forums Read


Go Back   Forums at Modded Mustangs > Mustang Forums > 5.0 Mustangs

Discussing 3g alt. upgrade in the 5.0 Mustangs Forum. what all do i need to switch my 2g over to a 3g?...

       

Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free!

 
LinkBack Thread Tools
Old July 9th, 2007, 01:41 PM   #1
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

3g alt. upgrade


what all do i need to switch my 2g over to a 3g?
 

Sponsored Links Remove Advertisements
Forums at Modded Mustangs Advertisement
Old July 9th, 2007, 01:44 PM   #2
Enthusiast
 
terribleonexx88's Avatar
 
 
Join Date: Oct 2006
Location: new england
Posts: 817
Default

http://www.corral.net/tech/maintenance/130a-tech.html
__________________
85 svo. work in progress
 
Old July 10th, 2007, 10:52 AM   #3
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

got another ??, can i run a u/d pulley on the 3g and still run an electric fan
 
Old July 10th, 2007, 11:23 AM   #4
MM Fanatic
 
JBIGBOOTSY's Avatar
 
1990 LX hatch
 
Join Date: Aug 2006
Location: Hobart Indiana
Posts: 3,595
Default

it depends where you get the alt. I got mine from autozone and the pully that came on it was huge. I swapped it out for the one on my old alt. I had to have about .125 milled of the back of the old pully yo fit the new alt. Now I have full charge at 600 rpm.
__________________

Bolt-on Abraham Lincoln Log motor. With extra wiring.
 
Old July 10th, 2007, 11:25 AM   #5
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

im thinkin mine is the original alt. i work at a junkyard and i got one off a 95 thunderbird
 
Old July 10th, 2007, 11:27 AM   #6
Newbie
 
1990 HATCH
12.56@118
 
Join Date: Oct 2006
Posts: 27
Default

all you need is a new wire harness. You shouldnt use the same one (fire). I found mine at 50resto.com. Get the power wire too. It reduses the noise a little. Good luck.
 
Old July 10th, 2007, 11:51 AM   #7
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

i got the wiring off the same car...would this work also
 
Old July 17th, 2007, 08:58 AM   #8
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

well i got her installed last night...it was ALOT easier than i thought it would be...thanks for all the info guys
 
Old July 17th, 2007, 09:52 AM   #9
Enthusiast
 
 
Join Date: Oct 2006
Location: Augusta, GA
Posts: 906
Default

You'll need a smaller pulley if you run underdrive and electric fan, like Bootsy said. Really if you run underdrive at all - I have a manual trans and when I didn't run a smaller pulley I would stall the engine if I tried to ease out of a light without giving it some gas. It's being a little lazy, but the voltage would drop so low that I'd lose the spark.

I'm not afraid to give her some gas , but I love knowing that I have enough torque to start rolling at an idle.
 
Old July 17th, 2007, 11:46 AM   #10
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

the pulley on the 3g is the same size as the underdrive pulley on my old 2g...how do i get a smaller pulley
 
Old July 17th, 2007, 09:48 PM   #11
Enthusiast
 
 
Join Date: Oct 2006
Location: Augusta, GA
Posts: 906
Default

Originally Posted by 91foxhatch5.0
the pulley on the 3g is the same size as the underdrive pulley on my old 2g...how do i get a smaller pulley
Not sure, there was a local aftermarket place that knew exactly what we needed as soon as we said "Mustang", "underdrive" and "alternator". Do you have any speed shops around that could order stuff like that for you?
 
Old July 18th, 2007, 08:25 AM   #12
Regular
 
1991 mustang lx 5.0
14.5@92
 
Join Date: Nov 2006
Location: welcome, nc
Posts: 131
Default

i order my parts off 50resto.com
 
Old July 18th, 2007, 09:42 AM   #13
MM Fanatic
 
JBIGBOOTSY's Avatar
 
1990 LX hatch
 
Join Date: Aug 2006
Location: Hobart Indiana
Posts: 3,595
Default

some 3g alternators have a large pully, and some have a small pully. If yours has the same pully dia. as your stocker than you should be ok.
__________________

Bolt-on Abraham Lincoln Log motor. With extra wiring.
 
Reply


Thread Tools


Threads Similar to: 3g alt. upgrade
Thread Thread Starter Forum Replies Last Post
Getting an upgrade but not sure what to get ocsailor86 96-98 11 June 17th, 2007 11:34 AM
Looking for an upgrade TweederGT03 Exhaust 13 February 26th, 2007 01:30 PM
possible upgrade to v8 Orangester V6 Mustangs 7 January 23rd, 2007 10:30 PM
upgrade kbblown99gt 99-04 3 January 4th, 2007 01:08 AM
Next Best Upgrade? superbeef1000 99-04 7 October 25th, 2006 07:37 PM


All times are GMT -4. The time now is 07:41 AM.
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company.
Forum is powered by vBulletin ©2000 - 2010, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.