• 1 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
AOD Conversion
#1
OK - so I've installed the AOD into my '71 behind the 351C-2V and have made the following observations. Hopefully someone else can use to help with their AOD conversion. I will add more information as I recall it. Wink

Car Specs:
- 1971 H-code Mach 1
-- 351C-2V engine
-- FMX automatic
-- Ford 9" rear axle w/3.00:1 R&P
-- Hooker Competition Header (ceramic coated)
-- Pypes 2.5" stainless w/X-pipe

New transmission candidate
- 1989 AOD from 5.0L Mustang GT (with absolutely everything, except the slip-yoke, speedo cable, and fluid cooling lines)
-- shifter & cable
-- TV cable
-- wiring harness (neutral safety switch and back-up lights)
-- dipstick and tube
-- bell housing mounting bolts (longer than FMX mounting bolts)
-- torque converter

Parts purchased (so far):
- 28 oz flywheel from mid-'80s Crown Victoria (P/N: FRA-205 Pioneer Inc)
- Mr. Gasket flywheel bolts (P/N 6710)
- Aftermarket transmission crossmember (Ron Morris Tremec/AOD 67-73 - P/N: T5C4 from CJ Pony Parts) * not using it - doesn't quite fit right with headers
- AOD yoke (Rosehill Performance)
- U-Joint (conversion from AOD to Mustang driveshaft ... P/N coming soon)
- 1989 5.0 Mustang Starter (P/N coming soon)

So I pulled the engine and tranny out early on in Sep 2010, and I acquired the AOD by chance - so I was going to be putting the complete drive train in without any kind of recent, "well, that's how it was when I took it out" reference. I did discover that the overall length of the AOD and FMX are identical - bell housing to output shaft: 30.5" - meaning, the stock driveshaft should still work.

I put the AOD on a tranny jack and cleaned everything with Permatex Engine Degreaser Gel, power rinsed, took a wire brush to the nooks and crannies. Then I hit it with some Permatex Foaming Engine Degreaser to get it like this:
[Image: 401624_449151045095819_2127023286_n.jpg]

Once that was done, I installed the flywheel and discovered the flywheel bolts that came with the AOD were too long. Some new bolts did the trick, and I had the tranny in the car within a few minutes using the cool Ron Morris crossmember I bought from CJ Pony Parts:
[Image: 401624_449151048429152_800154742_n.jpg?o...ced19ac6fa]

The only problem is the weird way it fit in there - it kinda didn't. I was going to be happy with just letting it sit a little crooked, but once I installed the Hooker Headers, I discovered that the aftermarket crossmember was simply too big, and poorly designed for headers:
[Image: 533372_452720158072241_367635158_n.jpg]

Since the collectors were hitting the crossmember, I had to come up with a new solution. I took the original FMX crossmember, cleaned it up and discovered that the pan on the AOD is bigger than the FMX's - that's the only difference in these trannies. So I notched the FMX crossmember, painted it, and installed it. Before I painted it, I put in between a couple of pipes and jumped up and down on it... if it can hold me at 6'5" & 300, it should do fine with the tranny:
[Image: 282990_453452187999038_1308095870_n.jpg?...7072174280]

Now the headers fit much better:
[Image: 522794_453452127999044_1520165078_n.jpg]

Afterward, I completed installing the exhaust system and began refurbishing the driveshaft. Removed the rust, painted, and installed new U-Joints. The front U-Joint is a conversion joint going between the stock driveshaft and AOD yoke.
[Image: 252362_457333127610944_28584412_n.jpg]

The 'X-pipe' on the exhaust actually passes under the output shaft for the AOD (the red plug above the 'X-pipe'):
[Image: 208932_456794440998146_932075024_n.jpg?o...e=54D03BDF]

I'm still finishing up the nit-noids (cooling lines, shift cable routing, the TV cable, etc.), but so far it's in and seems to fit. I'll add more as it comes and fill in the blanks as necessary.

A couple of things noted along the line:
- stock '71 starter motor doesn't work with the '89 AOD. Traded it back to the parts house for a stock '89 Mustang 5.0 starter motor - fit like a glove.
- stock AOD shifter cable got pinched with the Ron Morris crossmember and rested on top of the header collector. I altered the shifter cable bracket to move the cable up higher, but now fits tight with the FMX crossmember (picture coming later)
- the dust boot on the end of the AOD is smooshed like an accordion against the AOD yoke mounted on the stock drive shaft. With the trannies both having the same overall length, I'm a little surprised by this. I will do more research to find out if I need to shorten the drive shaft a little (maybe an inch). Fortunately, the suspension does not cause the slip yoke to travel very much in or out of the transmission during cycling up and down on the lift.
- there are no AOD for '71-'73 Mustang cooling lines to be had anywhere. Based on first glance, I believe some stock FMX lines will work with some modification - more to come.

Eric

[Image: mach1sig2.gif]
  Reply
#2
Very informative great job Eric...thanks for sharing
  Reply
#3
You sure you got a 28oz flexplate? 1981 and later 302s, including panther cars, were 50oz. A 164tooth big bell c4 application flexplate was used when my friend put an older motor in front of his AOD.

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
  Reply
#4
Totalled;80517 Wrote:You sure you got a 28oz flexplate? 1981 and later 302s, including panther cars, were 50oz. A 164tooth big bell c4 application flexplate was used when my friend put an older motor in front of his AOD.

This is the P/N of the unit I bought from O'Reilly Auto Parts (seems pretty common among the vendors): Pioneer FRA-205
[Image: 4]

Thanks for asking though - I never turn down having another set of eyes 'checking my work.' Especially when stepping into unfamiliar waters.

Oh yeah - after seeing this picture, I'm reminded that this flywheel goes on in a specific orientation, making it possible for the AOD's torque converter drain plug to fit.

Eric

[Image: mach1sig2.gif]
  Reply
#5
Looks like your moving along nicely. goodjob Mark

My garage http://www.7173mustangs.com/forum-garage...rxt_uid=40

73 mach 1 351c 4v cc ported, torker2, 750 edelbrock,C6.
73 fastback 351c 2v,performer intake,600 edelbrock,fmx, 325 trac-lok.
  Reply
#6
Love the pictures and the writeup. I'm doing the same in my convertible with 351 Cleveland and am not as far along as you. I'm swapping out a c6 though and my driveshaft is too short now.
  Reply
#7
Mister 4x4;80519 Wrote:This is the P/N of the unit I bought from O'Reilly Auto Parts (seems pretty common among the vendors): Pioneer FRA-205
[Image: 4]

Thanks for asking though - I never turn down having another set of eyes 'checking my work.' Especially when stepping into unfamiliar waters.

Oh yeah - after seeing this picture, I'm reminded that this flywheel goes on in a specific orientation, making it possible for the AOD's torque converter drain plug to fit.
That's it. Interesting they sold it for that application though..

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
  Reply
#8
Great work Eric, I'm glad you got the headers to work.

Jayson
[Image: 36319488731_8f2a376549_z.jpg]
73 Mach 1 Mustang
89 Dodge Shadow ES
94 Jeep Wrangler

  Reply
#9
Mister 4x4;80519 Wrote:
Totalled;80517 Wrote:You sure you got a 28oz flexplate? 1981 and later 302s, including panther cars, were 50oz. A 164tooth big bell c4 application flexplate was used when my friend put an older motor in front of his AOD.

This is the P/N of the unit I bought from O'Reilly Auto Parts (seems pretty common among the vendors): Pioneer FRA-205
[Image: 4]

Thanks for asking though - I never turn down having another set of eyes 'checking my work.' Especially when stepping into unfamiliar waters.

Oh yeah - after seeing this picture, I'm reminded that this flywheel goes on in a specific orientation, making it possible for the AOD's torque converter drain plug to fit.

Did you compare it to the FMX flex plate? I was always under the impression that the FMX flex plate would work on the AOD.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
  Reply
#10
TommyK, I totally forgot about this thread. I did not compare the FMX plate to the new 26 oz plate I picked up... I didn't even think to. I actually have 2 spare plates now (the original FMX plate, and the one from the '89 GT - and can't really tell them apart).

Here's an update picture - the '89 AOD shifter is probably not going to work. Apparently, the tunnel in an '89 has a little bit of slope to it, hence the 'dung-beetle' look of the shifter bezel.

[Image: 603038_549892205021702_1252810603_n.jpg]

I recently re-installed my dash board, and it looks like the handle (in Park) is a little closer to where I think the radio will be than I'd like. So, the new plan is to go with a B&M Megashifter. More to come.

Eric

[Image: mach1sig2.gif]
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
  Efi conversion Cainsable 6 577 09-15-2018, 10:56 AM
Last Post: fangstang
  AOD Shift Linkage for my 1973. timsweet 1 468 07-20-2018, 09:50 PM
Last Post: timsweet
  5-speed conversion questions scgamecock 7 941 01-11-2018, 08:46 PM
Last Post: Pastorpat
  AOD transmission swap in Dallas ft worth toastintx 6 938 09-19-2017, 09:27 PM
Last Post: toastintx
  Comp Cams Hydraulic Roller Conversion question 73pony 31 2,806 06-08-2017, 06:07 AM
Last Post: turtle5353
  T-5 Conversion complete 73pony 28 3,955 12-03-2016, 02:37 PM
Last Post: 73pony
  TCI street fighter AOD mbrew2 2 828 11-29-2016, 01:57 PM
Last Post: Don65Stang
  A Video on the In-Tank Fuel Pump Conversion for my 73 Autoedit 17 3,051 08-03-2016, 01:58 PM
Last Post: rcadd1ct



Users browsing this thread: 1 Guest(s)