69 Barracuda 408 Blue Print

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Mike Sprecher

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Just rebuilt my 69 Barracuda a year ago. Put a 408 Blue print motor in it and blew the trans. all forward no reverse. Looking to buy a new 904 (what I had in it, StreetFighter). Thought about about a 727 but i'm still not sure, Should I change the stall on the Torque Converter? Also I have a 7 1/4 rear. Thinking of going to a 8 3/4. Just looking for ideas and advice. Thanks

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The streetfighter should be fine with about a 2800 stall converter IMO. The 7 1/4 has to go with that combo, it won't last long. A 3.55 gear in an 8 3/4 should be good.

How did you blow the transmission? I thought the streetfighters were decent and would hold up.

*edit* N/M I see it was a stock 904.
 
Last edited:
In my post I worded it wrong. I have a stock 904. was looking at a Street Fighter 904 through Classic Industries. As I said, I thought about about putting a 727 in. Not sure if I wanna change the drive shaft and possibly the shifter linkage.
 
Woodys_Cuda said:
The streetfighter should be fine with about a 2800 stall converter IMO. The 7 1/4 has to go with that combo, it won't last long. A 3.55 gear in an 8 3/4 should be good.

How did you blow the transmission? I thought the streetfighters were decent and would hold up.

*edit* N/M I see it was a stock 904.
Click to expand...
Woodys_Cuda said:
The streetfighter should be fine with about a 2800 stall converter IMO. The 7 1/4 has to go with that combo, it won't last long. A 3.55 gear in an 8 3/4 should be good.

How did you blow the transmission? I thought the streetfighters were decent and would hold up.

*edit* N/M I see it was a stock 904.
Click to expand...
 
Mike Sprecher said:
BLOWN TRANS- I just Smashed the gas. Never noticed anything wrong until I put it in reverse.
Click to expand...
Hi Mike,
Nothing wrong with running a 904 trans if it's properly built. I suspect the stock trans had not been rebuilt since going in the car 56-58 years ago.
Streetfighter is good. A reputable local trans shop might be found by calling a local machine shop and asking for a rec. Or you can check with your buddies. A local shop may give you a customized build.
 
LS&S said:
Hi Mike,
Nothing wrong with running a 904 trans if it's properly built. I suspect the stock trans had not been rebuilt since going in the car 56-58 years ago.
Streetfighter is good. A reputable local trans shop might be found by calling a local machine shop and asking for a rec. Or you can check with your buddies. A local shop may give you a customized build.
Click to expand...
 
Just rebuild your 904 with quality parts and get a quality torque converter. Get an 8.75 put your fav gears in it with suregrip and let it rip.
 
Just curious, did the 904 case crack or anything? These trans are actually really easy to rebuild by yourself... it's just paying attention to details, once you do it once it's cake...
 
Icetech said:
Just curious, did the 904 case crack or anything? These trans are actually really easy to rebuild by yourself... it's just paying attention to details, once you do it once it's cake...
Click to expand...
Yeah, I was pretty surprised as well and mine was a slightly more complicated A999, but after the rebuild I just converted mine to non-lockup.
 

Cuprum-74 said:
Yeah, I was pretty surprised as well and mine was a slightly more complicated A999, but after the rebuild I just converted mine to non-lockup.
Click to expand...
Nice, didn't know you can do that... i assume it's mainly the input shaft and TC? maybe pump? any changes to the valve body to convert?
 
Icetech said:
Nice, didn't know you can do that... i assume it's mainly the input shaft and TC? maybe pump? any changes to the valve body to convert?
Click to expand...
Yup, shaft, pump and I just bought Turbo Action's Stage 2 'Cheetah' Valve body, but you could also make modifications to the OE valve body to disable the Lock-up function. I just opted for the easier but slightly stronger route, plus pre-inflation the Cheetah VB was only like $260.
 
Cuprum-74 said:
Yup, shaft, pump and I just bought Turbo Action's Stage 2 'Cheetah' Valve body, but you could also make modifications to the OE valve body to disable the Lock-up function. I just opted for the easier but slightly stronger route, plus pre-inflation the Cheetah VB was only like $260.
Click to expand...
yeah that's not bad..... i would love to switch to a OD trans but i can't give up the cable shift.
 
Icetech said:
yeah that's not bad..... i would love to switch to a OD trans but i can't give up the cable shift.
Click to expand...
Yeah I thought about getting an OD trans like the A500, but I also like my cable shift A999, plus the money I invested into the A999.
And also the fact that putting in the A500/518 was going to require a bit of tunnel surgery.
Mine came out of a 1988 Dodge Diplomat which was a retired police cruiser. The 2.74 1st and 1.54 2nd gears is a plus as well.
So I'm going the Gearvendors route soon. (been saving up the past couple of years)
 
Cuprum-74 said:
Yeah I thought about getting an OD trans like the A500, but I also like my cable shift A999, plus the money I invested into the A999.
And also the fact that putting in the A500/518 was going to require a bit of tunnel surgery.
Mine came out of a 1988 Dodge Diplomat which was a retired police cruiser. The 2.74 1st and 1.54 2nd gears is a plus as well.
Click to expand...
ahh sorry... i thought the 999 was a OD.. that's the 514 or whatever... silly brain :)
 
When you swap out the 7-1/4 to a 8-3/4 you will need a different driveshaft.

A 904 to a 8-3/4 is something like 48-3:4” ujoint to ujoint.

A 727 to 8-3/4 is something like 44-1/2”

You will need to verify exact measurements.

I have not measured my 904 to 7-1/4 drive shaft yet to see what it is.

I would also tell you to consider adding frame connectors to your car, you’ve got a lot of horse power now with that 408 motor.
 
If you can buy a complete 8-3/4 drum to drum you will be ahead of the game.

I bought a B-body 8-3/4 drum to drum and the had a chassis shop cut it down to A-body specs which are 52-5/8” end to end for the housing and spring perches are 44” center hole to center hole. That cost with new spring perches and labor was $355. Then about $200 for a 489 3:23 pumpkin.

I would tell you to look at the Dr Diff website to see what he offers.

Phil Saran
1968 Plymouth Barracuda Vert.
 
340sFastback said:
I bought a Dana for my '69 Barracuda, haven't swapped it in yet, but will be selling the 8 3/4 that is currently in the car once I get Dana swapped in. I see your in MD send a PM if interested.

View attachment 1716388197
Click to expand...
Love how your exhaust is tucked up tight. I still have the stock manifolds on mine
340sFastback said:
I bought a Dana for my '69 Barracuda, haven't swapped it in yet, but will be selling the 8 3/4 that is currently in the car once I get Dana swapped in. I see your in MD send a PM if interested.

View attachment 1716388197
Click to expand...
Love how your exhaust i tucked up tight. Makes it easier to drop the trans. I still have stock manifolds.
 
Mike Sprecher said:
I appreciate your help. The bands are shots. Guessing it came out of adjustment or the pump or servo was bad.
Click to expand...
Sounds like case/housing is not damaged, so your 904 can be rebuilt.
Maybe get a quote from a local shop to compare to the Streetfighter price. Local shop = local help if you have a problem. And no shipping costs.
Streetfighter transmission. $2300 is not a bad price at TCI. Link below. Probably a quick convenient option, if getting back on the road fast is your number 1 priority. Says free ship.
https://www.tciauto.com/streetfight...ZajjzHxnh8r9QN6wPAfevUMnx9ERVouwG4KWu-WoAdtWx
1744001112942.jpeg
 
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