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What tranny
#1
I have a 73 Q code making about 300hp at the rear wheels with an FMX that appears to be on the way out. Fluid leaking from the breather while sitting - suspect torque converter seal and the transmission is neutralising when cold so looks as though rebuild / replacement is in my near future.
Would love to hear from y'all what I should replace it with and best place to source a replacement. Rebuilding is an option I guess.
Have been thinking about AOD, but not sure? I live in the city now and will not do that much highway driving with this car.
Please share your thoughts / advice.
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#2
A C6 will get you around ok, and B&M produces beefed up parts for them which will increase performance.. You can also buy a complete B&M crate transmission & torque converter which will bolt up..
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#3
Biggest question is auto or stick?

If you want auto, definately go with something with overdrive. Then, it's a question of AOD versus 4R70W. AOD uses throttle cable, 4R70W uses electronic computer, which Bauman offers.

I went with a wide ratio AOD, but if I had to do it again, I probably would have opted for the 4R70W due to being able to control shift points. Th ewide ratio AOD uses the gear set from the 4R70W. The 4R70W is "wide ratio," meaning it has a more agressive first gear, but still has an overdrive.

So, you will have a more agressive first gear, and lower RPMs at highway cruising speeds.
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#4
CZ-75;187519 Wrote:Biggest question is auto or stick?

If you want auto, definately go with something with overdrive. Then, it's a question of AOD versus 4R70W. AOD uses throttle cable, 4R70W uses electronic computer, which Bauman offers.

I went with a wide ratio AOD, but if I had to do it again, I probably would have opted for the 4R70W due to being able to control shift points. Th ewide ratio AOD uses the gear set from the 4R70W. The 4R70W is "wide ratio," meaning it has a more agressive first gear, but still has an overdrive.

So, you will have a more agressive first gear, and lower RPMs at highway cruising speeds.

Thanks for those thoughts. I will definitely stay with automatic..
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#5
The C6 can easily handle your power, but it is not a very efficient transmission, and looses more due to lack of lock-up torque converter and OD. With your rear wheel HP I would want a built up AOD or 4R70W. My preference is the 4R70W, which I plan on replacing my C6 with.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#6
Don C;187526 Wrote:The C6 can easily handle your power, but it is not a very efficient transmission, and looses more due to lack of lock-up torque converter and OD. With your rear wheel HP I would want a built up AOD or 4R70W. My preference is the 4R70W, which I plan on replacing my C6 with.

Anyone ever mated a 4R70W to a 429 BBF? Seems like all the adapter plates out there are made only for AOD.
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#7
If you don't need OD then I would go C4 light relatively cheap,easy to get parts for here.and it will easily handle your hp or future up grades in hp. Try a place called Craig's autos in NSW (02) 97551158 disregard RVO trannies, rang a mate to check lets say he ain't anybody's first choice any more.

My 2 bits worth

He has all the vices I admire and none of the virtues I despise
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#8
lduke12;187620 Wrote:Anyone ever mated a 4R70W to a 429 BBF? Seems like all the adapter plates out there are made only for AOD.

Because the AOD-E/4R70W (with small block bellhousing bolt pattern and not Mod bolt pattern) is a direct replacement for the AOD, using the same flexplate and bolt patterns, an AOD adapter should work with a 385 series engine.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#9
lduke12;187620 Wrote:Anyone ever mated a 4R70W to a 429 BBF? Seems like all the adapter plates out there are made only for AOD.

If going for a non-stock appearance, why not put a E40D behind the 429, and enlarge the transmission tunnel as needed?

-Kurt

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How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
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#10
cudak888;187720 Wrote:
lduke12;187620 Wrote:Anyone ever mated a 4R70W to a 429 BBF? Seems like all the adapter plates out there are made only for AOD.

If going for a non-stock appearance, why not put a E40D behind the 429, and enlarge the transmission tunnel as needed?

-Kurt

More work than i wanted to do. I have the original C6 that came with the 429, but i don't know if i want to spend 2800 for a Gear Vendors. The 429 is a stroker motor stroked out to 521 cubes with a build meant to be a torque monster. Engine is pretty much almost ready to be swapped in, just need to figure out the rest of the drivetrain. Just wanted something that fit right in and didn't break the bank.
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