Black333
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I might suck at this more than you but, you never know
Posts: 430
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Post by Black333 on Aug 23, 2012 10:55:18 GMT -5
just bought a 76 royal monaco tonight, running 360 it in... guy claims it has a 727 behind it, said he knows its a 727 cuz 904s didnt come behind 360's... is this true? I thought they had either, I can tell the difference but didnt climb under it to look and find out... hoping its a 727 so i can hook my slider up to it its easy to tell from the top also. just look down where the dipstick goes in. you can see the bump out if its a 727.
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Post by XtremeMopar#307 on Aug 23, 2012 21:54:29 GMT -5
just went and got the car... it is indeed a 727 according to the bump in the side... thanks guys
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Post by 77caddy on Aug 24, 2012 17:51:04 GMT -5
any one know why the tranny lines would be shaking after it ran for five minutes? its a 727
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WILSON'S INC.
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I am so sick of resto guys wasting good derby parts.
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Post by WILSON'S INC. on Sept 5, 2012 20:04:06 GMT -5
I have an older 318, not sure year I believe 70 or 71 , I have a lockup 904 out of a 79 magnum, is there anything i need to worry about other than the correct convertor when it comes to running this newer style tranny behind the older motor? I still have the newer motor, but it seems easier to me to swap a trans than an oil pan for my purposes.
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Post by mkvien on Sept 5, 2012 21:31:19 GMT -5
I have an older 318, not sure year I believe 70 or 71 , I have a lockup 904 out of a 79 magnum, is there anything i need to worry about other than the correct convertor when it comes to running this newer style tranny behind the older motor? I still have the newer motor, but it seems easier to me to swap a trans than an oil pan for my purposes. Should be fine, liek you said though, make sure you keep the coverter with the tranny.
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Sept 6, 2012 10:51:39 GMT -5
there could be up to 4 different torque converters for a 900 series trans in play from the 70's
- non weighted, non lockup - non weighted, lockup - weighted, non lockup - weighted, lockup
Your 318 needs a TC to be non-weighted
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Post by demolitioncrew on Sept 11, 2012 9:00:40 GMT -5
What is the knob right above the shifting knob, there two of them one above the other and the bottom on shifts the tranny but I don't know what the other one does. It's a 727 by the way
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Post by mkvien on Sept 11, 2012 10:15:43 GMT -5
What is the knob right above the shifting knob, there two of them one above the other and the bottom on shifts the tranny but I don't know what the other one does. It's a 727 by the way It is the kick-down lever. Spring loaded thing, needs to be tied back to keep line pressure up in the transmission. Somewhere around 3/4 of the way tied back seems to work.
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dm440c
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Post by dm440c on Sept 11, 2012 10:58:25 GMT -5
yes, tie it back... #1 mistake made by chevy guys right before they cuss out Mopar transmissions
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Post by demolitioncrew on Sept 12, 2012 14:56:43 GMT -5
What even happens if u don't tie it back?
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Black333
Heat Winner
I might suck at this more than you but, you never know
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Post by Black333 on Sept 12, 2012 15:22:34 GMT -5
What even happens if u don't tie it back? the trans thinks the engine is at idle when you have your foot to the floor and it burns it up. the lever is throttle pressure. the more you push the gas the more the linkage moves the lever on the trans. get rid of the linkage and tie the lever back 3/4 of the way
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Post by JOHNNYREB on Sept 12, 2012 18:17:01 GMT -5
What happens if u tie it all the way back. I wired mine all the way back and ran it thru 1 heat and a main , seemed to work fine but then again Im 1 of those chevy guys mantioned above...jus sayin. Will it burn the tranny up ??
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Post by mkvien on Sept 13, 2012 10:25:53 GMT -5
What happens if u tie it all the way back. I wired mine all the way back and ran it thru 1 heat and a main , seemed to work fine but then again Im 1 of those chevy guys mantioned above...jus sayin. Will it burn the tranny up ?? I don't think it hurts anything, but it might never shift out of first if you want it to.
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Sept 13, 2012 10:28:44 GMT -5
no, the lever position is a proportional control for the line pressure. The further back it is, the more it dials up line pressure. Upshifts are determined mostly by comparison of line pressure to output shaft speed so the further back you tie it, the faster your output shaft has to turn before it upshifts. All the way back will jack up the line pressure which may not be a bad thing but depending on your rear gear ratio it may never get out of 1st gear.
The problem as mentioned above is when line pressure is artificially low it affects the fluid pressure that works the actuators, producing a soft shift. If you combine a soft shift with a crap ton of torque and/or RPM you overheat friction material pretty fast and smoke your transmission. If it is artificially high you just delay shift points.
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Post by Johnny L on Oct 21, 2012 8:25:47 GMT -5
After a few seasons of running a 3 speed I've decided to back to an automatic. Anyone used an A500 (42RH) transmission behind a small block before? I was going to go thru the process of having a 904 rebuilt but I have a perfectly good A500 trans that's already been "freshened up" collecting dust in the garage. From what I understand from doing a lot of reading, it's essentially a 904 with a different tailshaft that houses the overdrive unit. It's about 6 inches longer than a 904 as well. I guess what I'm wondering is that for our purposes, the A500 should operate the same as a 904/727 as far as only using 1st and reverse? The overdrive shouldn't effect anything for demo purposes correct? It has a lockup converter too but just to clarify, the lockup shouldn't effect anything as far as using the trans for demo purposes correct? I do like the fact that the tailshaft of the 500 is much beefier than a 904 and the case seems a bit thicker, as well as having a deeper pan that holds more fluid. Thoughts/opinions? Oh I will be using a trans brace next season for the first time as well if that makes any difference. 904 up top, 500 on bottom
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