AOD to C6 conversion binding
Thread Starter
|
2nd Gear
Joined: Nov 2024
Posts: 2
Likes: 0
AOD to C6 conversion binding
I have an 88 f150, 5.0. Its somewhat of a resto project after rescuing it from a previous owner in barely running condition. The original AOD (non electronic) was shot. I expect multiple things led to this, a combination of mileage (180K) and probably something to do with the coolant being an interesting color pink. I had quick access to a C6 and I am good with that despite not having overdrive. The C6's are pretty legendary for their ability to take abuse. Its from an 86 f250 with a 351 small block. The bellhousings are the same and externally the transmission bolts right up to the 5.0. Then the problem occurs. Once the transmission is bolted up and the converter bolted to the flex plate (the AOD plate from the 5.0), the entire thing is bound up. Both engine and transmission move freely when they apart, but bind when bolted together. I can't turn the crank with a wrench. I can't seem to tell what might be binding up.
Is there anything specific I should check? Do I need to swap the AOD flex plate for a C6 plate?
Is there anything specific I should check? Do I need to swap the AOD flex plate for a C6 plate?
Cargo Master
Joined: Oct 2020
Posts: 2,703
Likes: 800
There are different depths to the flexplates depending on which transmission you're using. The problem is your 351 flexplate won't work on your 88 5.0 engine. The 351 engine always used a 28oz balance factor where the 5.0 engine used 50oz. Your 351 piece could be used to mock it up just to make sure that it fits before you order the one for the 5.0. I'm also assuming that they made a truck with the 5.0/C6 combination.
Thread Starter
|
2nd Gear
Joined: Nov 2024
Posts: 2
Likes: 0
There are different depths to the flexplates depending on which transmission you're using. The problem is your 351 flexplate won't work on your 88 5.0 engine. The 351 engine always used a 28oz balance factor where the 5.0 engine used 50oz. Your 351 piece could be used to mock it up just to make sure that it fits before you order the one for the 5.0. I'm also assuming that they made a truck with the 5.0/C6 combination.
I wasn't thinking the depth difference would be that big, but it's worth looking at. Thanks.
Cargo Master
Joined: Oct 2020
Posts: 2,703
Likes: 800
If you compare each one I think that you'll find that on the engine side of the plate the C6 one will be pressed so that the surface where the converter nuts sit is about even with that side of the starter ring. The other one will be pressed in the opposite direction about the the same amount.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
I don't think there is enough offset difference between the C6 and AOD flexplates to cause a binding problem with the TC in this case, it is enough to cause damage to an AOD trans with the other combo(C6 flexplate+AOD trans) but with a C6 the mismatch should provide more TC clearance not less. So I think your problem is that the TC isn't fully seated in the transmission, with the trans fully bolted to the engine the TC should still have some free play to move in and out of the trans a little.
Thread
Thread Starter
Forum
Replies
Last Post
Milwaukee1979F150
1987 - 1996 F150 & Larger F-Series Trucks
13
Nov 18, 2012 01:38 AM
ghostwhite
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
9
Jun 27, 2012 08:11 PM
mebe2k
Clutch, Transmission, Differential, Axle & Transfer Case
2
Feb 15, 2011 03:35 AM
