Inspector71

Honest, I tried to get my friend to sell me the whole car but he wouldn't. He has an 84 Diplomat with a 318 and auto trans. He has a fairly new cam with a 484 lift, lifters, headers, new water pump, and double roller timing chain which he was going to sell me for $240 for my 360. Then he says I can have the 318 for $250. Okay deal. Then he says I can have the tranny for another $60 just to get rid of it. So I bought that too. I get the motor and trans and they look good. He says the tranny is a 727 with torque converter lock. Another friend looked at it and says it is a 904 tranny. Too much dirt and crud to read numbers at this point but it sits next to a small block 727 for my 360. The 360 tranny has a larger and different shaped pan and the 727 slopes down like a funnel from the front but the 318 has a ridge in it. I'll tray to scrape enough junk off to find the numbers and I wish I had pictuers. It is not that big a deal to me but eventually I'll need to know what I have.

moe7404

i bought a NEW 1984 ply fury 318. i allso bought a paper factory service manual. the stock trany is a 904. do NOT put the 904 behind the 360. especially with a cam. the 904 would be fine behind the 318 if you put a shift kit in the 904. but not to much cam. the stock 1984 318 904 trany had a lock up covertor. the lock up action was so smooth it was hard to tell when it locked up at 45 MPH. on any chrysler in the 727 904 family ALLWAYS put a shift kit in. some people say to not do it on a high mileage trany. i have done it on a 90,000 miles trany with no trouble. the older 360 had balance weights on the convertor. ie keep 318 parts on the 318, and the 360 parts on the 360. AND ONLY use ATF +4 fulid. do NOT use a reg fulid with a add on oil. B&M has a flex plate with the weights for the 360 in front of a 318 trany. DO NOT USE ONE. it does NOT clear the dust cover.

Inspector71

I owe you for the heads up. I've got a 727 for my 360 but this is where your advice saves me. I want to stroke the 318 (390 cubes) and based on what you said, the 904 would be a bad choice. Whew, I appreciate it.

moe7404

if you take note chrysler changed the motor mounts from 318 to 340-360 so you would not put a low hp trans behind a high hp engine, why they changed the mounts ill never know. allso note the trans in a 383 is NOT the same trans for 440. OH you can bolt a 440 to a 383 trans but on 20,000 miles you will NOT be happy. in both 904 and 727 the strength is NOT in the case, its in the INSIDE PARTS my basic rule keep it the way chrysler did it.

RacerHog

Ok...Here is my 2 cents.....
You can use ether trans on ether engine combo......
Just make sure you build the trans to handle the power specifically....

I like John Cope At Cope Racing Trans....

https://www.coperacingtrans.com/inde...ef12bd676a9e58

moe7404

as allways Racer brings us the truth.

RacerHog

Sorry Moe......

Don't hate me because I'm Beautiful....

TVLynn

That makes no sense ? there are difference, I am aware of that. I don't believe that is why the motor mounts were changed. A 383 trans would live a long life behind a 440, other than governor shift speeds.
When you start racing ALL bets are off. The racers used the 904 internals in the 727 case. it could last one run or ???
Motor mounts make NO difference to the trans used...