250 ci with aod swap

[Straight Six]

Whos done a 250 ci with aod swap into a 67 mustang 200ci--excatly whats required(step by step) and did anyone take pics of their conversion?? and what performance/mpg gains were there by doing this(reliable daily driver being the goal) or would a 300 ci with aod provide any advantages??

 

[rbohm]

8) the joys of having a tech section attached to this site here you go

http://fordsix.com/tech/engine/200_swap.php

 

[Anonymous]

The 200 to 250 swap is pretty basic as the tech article says.

Now the AOD thing is another story. From what I have read here there is really nothing to be gained by swapping to an AOD. Your engine RPS @65mph will be very close to a C4 with a proper stall converter. The extra weight of the AOD probably off sets any fuel savings.

 

[fb71]

The 200 to 250 swap is pretty basic as the tech article says.

Now the AOD thing is another story. From what I have read here there is really nothing to be gained by swapping to an AOD. Your engine RPS @65mph will be very close to a C4 with a proper stall converter. The extra weight of the AOD probably off sets any fuel savings.

???

3rd gear in a C4 is 1.00:1 ratio. 4th gear in an AOD is 0.69:1. C4's do not have a lock-up converter (but a C5 does), which means you have a 200-300 rpm overrun between the crank and input shaft at steady-state cruise. All AOD's have lock-up, which gives you a 1:1 ratio thru the converter, vs a C4's 1.25:1 ratio. The added shear in the C4 converter generates more friction, raises fluid temp, and consumes more hp, which lowers fuel economy. The C4 is not significantly lighter than the AOD, so the weight issue is more or less moot. The major advantage to an AOD is the ability to run a steeper rear axle ratio (3.27:1 vs 2.73:1) to gain more acceleration (greater torque multiplication - 1st gear of both units = 2.46:1 times the axle ratio 3.27 or 2.73 = 8.0442 vs 6.7158), and still run the same engine rpm at cruise speed in top gear. Or, leave the axle ratios the same, and gain some fuel economy at cruise speed. It all depends on hoe you configure the vehicle.

 

[Straight Six]

The 200 to 250 swap is pretty basic as the tech article says.

Now the AOD thing is another story. From what I have read here there is really nothing to be gained by swapping to an AOD. Your engine RPS @65mph will be very close to a C4 with a proper stall converter. The extra weight of the AOD probably off sets any fuel savings.

???

3rd gear in a C4 is 1.00:1 ratio. 4th gear in an AOD is 0.69:1. C4's do not have a lock-up converter (but a C5 does), which means you have a 200-300 rpm overrun between the crank and input shaft at steady-state cruise. All AOD's have lock-up, which gives you a 1:1 ratio thru the converter, vs a C4's 1.25:1 ratio. The added shear in the C4 converter generates more friction, raises fluid temp, and consumes more hp, which lowers fuel economy. The C4 is not significantly lighter than the AOD, so the weight issue is more or less moot. The major advantage to an AOD is the ability to run a steeper rear axle ratio (3.27:1 vs 2.73:1) to gain more acceleration (greater torque multiplication - 1st gear of both units = 2.46:1 times the axle ratio 3.27 or 2.73 = 8.0442 vs 6.7158), and still run the same engine rpm at cruise speed in top gear. Or, leave the axle ratios the same, and gain some fuel economy at cruise speed. It all depends on hoe you configure the vehicle.

Id probably leave the axles as fuel economy is 1st and off the line is 2nd.Eventualy ill do things like dual headers and upgrade to 2bbl or efi?? and new head from http://www.classicinlines.com/-- basically itll be a piece by piece affair unless i win the lotto,get a really good stock tip, horse race--lol---my kids college fund!!!!--no really ill just have to budget myself and this will take probably the next 5 yrs to do--im being optimistic----1st thing illl do is find me a 67 stang with a 200 ci/c4 combo and just enjoy it

 

[MustangSix]

A rear gear of around 3.55 to 3.73 is a good match for an AOD. Definitely add a shift kit and make sure the Throttle Valve is properly connected.