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Author
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Topic: New 81 Stang...need advice
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W Bates
Journeyman Posts: 4
From: Spokane WA.
Registered: Oct 2001
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posted 10-15-2002 03:51 PM
  
I just picked up an 81 for my son and have some FAQ's.1) What will it take to replace the 6 with a 302?
2) What tranny do I have and need for the swap?
3) What rear end do I have, and will any 8.8 fit if I need one? Thanks for the help.
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JCQuinn@work
Gearhead Posts: 215
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 10-15-2002 04:00 PM
Welcome to M&M.I am sure that this has all been done by members who have actual experience and they will answer soon. I own two fox body Mustangs but all of my modification knowledge comes from books while I wait on the world's slowest contractor to finish building a garage. 1. Some of the early sixes require a different K-member to install a 302. I am at work but when I get home tonight I can look in my reference book and be specific. 2. Is it a stick or auto, again I will look in my book when I get home. 3. You need an 8.8 and it should bolt right in. John
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TurboGT
Journeyman Posts: 41
From: Hutchinson, Kansas
Registered: Mar 2002
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posted 10-15-2002 04:10 PM
1) You will need a V8 (or I4 w/ V8 brackets)K-member (crossmember), and V8 motor mounts.2) Do you have an auto or manual transmission? If it's auto (C4/C5), it can be used by changing bellhousing, but they're not as strong as an orininal V8 trans. If it's manual, it needs to be swapped to a V8 unit, SROD, T-5, or one of the upgrade manuals such as Tremec. 3) You have a 7.5" rearend. An 8.8 from an '86-up V8 Mustang is a direct bolt-in. An 8.8 from a Thunderbird/Cougar/Mark VII can be used, but you'l have to install the axles and brakes from your 7.5" rearend to maintain stock track width and wheel bolt pattern. Other things to keep in mind:
Oil pan on the 302 must be from Fox body car, and V8 flywheel balance changed from 28 oz-in to 50 oz-in in '81. There could also be swap issues between serpentine belt V8 accessories vs. V-belt accessories, and water pump rotation. It's easiest to use a post '81 V8 from a Fox body to accomplish your swap.
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67coupe
Gearhead Posts: 277
From: dallas NC usa
Registered: Nov 2000
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posted 10-16-2002 10:50 PM
is u 6 cyl a v6 or an inline i know both came in mustangs but not sure when the changeover wasthe v6 (3.8) has alot of things that will work with the v8 so good luck eithor way  ------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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TurboGT
Journeyman Posts: 41
From: Hutchinson, Kansas
Registered: Mar 2002
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posted 10-17-2002 03:16 PM
The V6 didn't come out in Mustangs 'til '83. The '81 would have the 200 inch inline 6.
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W Bates
Journeyman Posts: 4
From: Spokane WA.
Registered: Oct 2001
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posted 10-17-2002 03:38 PM
It is an inline 6 with an auto. I have one other question too...What do I need to convert the front spindle to 5 lug? Will any work?Wally
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TurboGT
Journeyman Posts: 41
From: Hutchinson, Kansas
Registered: Mar 2002
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posted 10-17-2002 04:04 PM
The budget way to get 5-lug is to re-drill your existing rotors. The spindles are the same for all of the engine sizes. Here's a good fox brake info site:
http://svo73mm.cjb.net/
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