Yet another v8 swap

[LILCBRA]

Out of stock , Can I use my v6 converter ? the motor I have is maybe 180-200 HP .

That's a good question, but apparently no. I did a search on using a smaller engine's torque converter behind an 8 cylinder. Apparently it's been done to achieve higher stall speeds. From the Google AI response:

In older vintage applications (like 1970s and 1980s Chevy Vegas), some hot-rodders used a Vega 4-cylinder converter behind a small-block V8 strictly as a budget trick to achieve a high stall speed for drag racing. However, this required specific legacy transmissions (like a Powerglide or early TH350) and was notorious for ballooning or failing under real street-driven V8 power.

 

[welder4956]

I remember seeing somewhere about the bolt circle being smaller than a standard Ford. It seems like standard Ford converters have a 10-1/2 bolt cirlce whereas the II has a 9-7/8 or 9-3/4 bolt circle. I'll have to search again and see if I can find it - seems like it would be pretty useful, especially right now.

The official dimension is 9.3 in. bolt circle, which seems to match my tape measure.

 

[welder4956]

I messaged the seller and was told they had no info other than the EB description . Big parts house .

That's the (non)answer I got as well:

 

[dulcimerbob]

That's a good question, but apparently no. I did a search on using a smaller engine's torque converter behind an 8 cylinder. Apparently it's been done to achieve higher stall speeds. From the Google AI response:

In older vintage applications (like 1970s and 1980s Chevy Vegas), some hot-rodders used a Vega 4-cylinder converter behind a small-block V8 strictly as a budget trick to achieve a high stall speed for drag racing. However, this required specific legacy transmissions (like a Powerglide or early TH350) and was notorious for ballooning or failing under real street-driven V8 power.

Seems I'm out of luck on the TC . I can't see 600 and up for performance converter . Not sure what to do except go to the 10 3/4 157 flex and a hammer . thanks

 

[Blackhawkxx]

Or put a manual trans in it.

 

[welder4956]

Seems I'm out of luck on the TC . I can't see 600 and up for performance converter . Not sure what to do except go to the 10 3/4 157 flex and a hammer . thanks

It looks like a used converter or donor car is your only choice if you stay with an automatic, or try to shoehorn in a larger bellhousing. Why not sell the V6 car and buy a V8 car?

 

[LILCBRA]

One thought - maybe check with transmission shops to see if they can't locate one for you. With any luck they'll have some source somewhere that the general public isn't aware of.

 

[welder4956]

These folks have a pretty comprehensive listing of the different torque converters available for C4 transmissions with their dimensions. There are a few that are close to the Mustang II dimensions, but just slightly larger or have different pilot hub dimensions. The #2512 for the 2.8L/170, 3.3L/200, Maverick, Fairmont, Zephyr, Mustang is awful close. Their listing does not show what is in stock, so you might contact them to see if they have a Mustang II converter.

https://gopnh.com/Ford-Transmissions/C4

 

[dulcimerbob]

It looks like a used converter or donor car is your only choice if you stay with an automatic, or try to shoehorn in a larger bellhousing. Why not sell the V6 car and buy a V8 car?

And spoil all my fun ???

 

[dulcimerbob]

And spoil all my fun ???

Considering a t-5 swap . I'd rather have a stick anyway. This week I plan to pull the old 2.8/C4 . I looked into just building the v6 but the parts are expensive and you wouldn't have much to show for it . The old c4 may be toast anyway . The saga continues .