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Stock 904 okay behind mild 340? #534256 11/23/09 09:44 AM 11/23/09 09:44 AM
Joined: Oct 2004 Posts: 480 Kentucky, USA D derekeh OP mopar
derekeh OP mopar D Joined: Oct 2004 Posts: 480 Kentucky, USA	The 727 in my cuda is shot so now I need another tranny. I really hate to search for another 727 because I plan on putting a 518 tranny in a couple months. I have a stock 904 that I used behind a 318 for a while. Should it be able to hold up behind a mild 340 or am I wasting my time? 340 is stock 1970 motor with headers and hughes whiplash cam. I have the right driveshaft and everything for this swap so its not too big a deal.

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534257 11/23/09 09:49 AM 11/23/09 09:49 AM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	As long as you idle around you'll be fine ... There's a reason the factory didn't put the 904 behind a STOCK 340, which you do not have, even when they finally put it behind a 360 it was a beefed up version. But go for it and let us know how it works out ...

Re: Stock 904 okay behind mild 340? [Re: JohnRR] #534258 11/23/09 09:52 AM 11/23/09 09:52 AM
Joined: Oct 2004 Posts: 480 Kentucky, USA D derekeh OP mopar
derekeh OP mopar D Joined: Oct 2004 Posts: 480 Kentucky, USA	Yeah maybe itd be a waste of time

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534259 11/23/09 09:55 AM 11/23/09 09:55 AM
Joined: Feb 2005 Posts: 5,221 Branson, Mo. J joedust451 super gas
joedust451 super gas J Joined: Feb 2005 Posts: 5,221 Branson, Mo.	It should be fine, 904s are alot stronger then some may think, i've tore up a few 727s behind 340s, but in my 360 magnum dart, it'll retain the 904 that came in it, when or if it goes, i'll just just beef it up some, I had a 73 Swinger with a very stout 370 cu. with a built up 904 & Kevlar bands/cheetah VB, it was a killer tranny & laughed at that 370, so if your 904 is in decent shape (even stock), drop it in & don't sweat it. 75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534260 11/23/09 09:58 AM 11/23/09 09:58 AM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: Yeah maybe itd be a waste of time Ifit's only for a short time and you think before you shoot then you could probably still drive it , but if you are going to put it in and beat the snot out of it then , you'll be pulling it back out sooner than you think. I know on my Dad's 72 duster with the 318 , as soon as I installed headers on it, put in an 8 3/4 with 3.23's and started beating the snot out of it , 17 yr old that just got his license, the 904 didn't last long ... the 7 1/4 took a dump first. Granted I doubt he ever had the fluid changed and the car had about 80k on it when I got my license .

Re: Stock 904 okay behind mild 340? [Re: JohnRR] #534261 11/23/09 12:13 PM 11/23/09 12:13 PM
Joined: Oct 2004 Posts: 480 Kentucky, USA D derekeh OP mopar
derekeh OP mopar D Joined: Oct 2004 Posts: 480 Kentucky, USA	Yeah im thinking of just putting it in there for now... babying it for the most part lol. Ive always wanted to attempt a transmission rebuild so I might do it on this 727.

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534262 11/23/09 12:17 PM 11/23/09 12:17 PM
Joined: Nov 2003 Posts: 5,048 Atlanta Indiana D Dave Watt master
Dave Watt master D Joined: Nov 2003 Posts: 5,048 Atlanta Indiana	I've been running a 904 in my 340 Duster for years without a problem, street and strip. If a Cuda is like a Duster, the shifter and kickdown linkage is completely different between a 727 and 904.

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534263 11/23/09 12:17 PM 11/23/09 12:17 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC master
JonC master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	904 behind mildly built 340 in an Ebody for 15 years now and run hard a lot. Not one problem.

Re: Stock 904 okay behind mild 340? [Re: Dave Watt] #534264 11/23/09 12:24 PM 11/23/09 12:24 PM
Joined: Oct 2004 Posts: 480 Kentucky, USA D derekeh OP mopar
derekeh OP mopar D Joined: Oct 2004 Posts: 480 Kentucky, USA	So the linkage for my slapstick from my 727 wont work?

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534265 11/23/09 01:04 PM 11/23/09 01:04 PM
Joined: Jan 2003 Posts: 826 Stone Mt, GA. D DEMONSIZZLER super gas
DEMONSIZZLER super gas D Joined: Jan 2003 Posts: 826 Stone Mt, GA.	Quote: So the linkage for my slapstick from my 727 wont work? It will work as long as the 904 has the mounting tabs(two)under the tail shaft for the vertical shifter shaft that goes through the side of the trans tunnel. You will have to use the bracket from the 727 and the rest of the associated shifter parts from the 727 and the drive shaft from the 727 will be too short by about 4". I actually like the 904 more behind a 340 and have also drag raced with one for about 4 yrs and have driven on the road and no problems. I did modify the valve body to firm up the shifts and exclusively use only type F trans fluid and a brass screen filter. You should be ok and do not expect the trans to hold up to slicks or excessive hi stall launches. If the trans is in good working order, it will hold up, David. ThermoQuads:stock, street/strip and race; 800/850 cfm's, 860/910 cfm's and 1,000 to 1,060 cfm's. New parts for all OEM 1971-1984, Competition Series and SuperQuad carbs and custom fabricating. Carbs bought and sold. Consulting on pre-purchases so you get the right carb the first time.

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534266 11/23/09 01:15 PM 11/23/09 01:15 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	I ran a 904 behind a 340 for years too. It even had nitrous that I would play around with on the street. Tranny had a shift kit installed and it would bark the tires. Car rusted out, still have the tranny. I'd install it(904) and see what happens.

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534267 11/23/09 04:04 PM 11/23/09 04:04 PM
Joined: Aug 2007 Posts: 6,096 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,096 Valencia, España	and advantage of the 904 is a lighter mass rotation as far I have known... Of course thats it could be a weak point if we talk about a heavy bracket car, but not on a mild car With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: Stock 904 okay behind mild 340? [Re: NachoRT74] #534268 11/23/09 04:37 PM 11/23/09 04:37 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	Put it in a heavy B body and see the trans come apart. I have used them 3 in my 73 and never again! However they are good for close to .15 in the qtr ove a 727. A good 727 in a heavy car is worth the extra money and slower times

Re: Stock 904 okay behind mild 340? [Re: derekeh] #534269 11/23/09 05:18 PM 11/23/09 05:18 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: Should it be able to hold up behind a mild 340. I have the right driveshaft and everything for this swap so its not too big a deal. (1) yes (2) your all set live every 24 hour block of time like it's your last day on earth

Re: Stock 904 okay behind mild 340? [Re: JohnRR] #534270 11/23/09 06:23 PM 11/23/09 06:23 PM
A Anonymous Unregistered
Anonymous Unregistered A	yup. 904's in heavy cars with some power not a good idea. unless you like shredded floorboards and your girlfriend beating on you saying [Edited by Moparts - Family Friendly Site - Keep it clean]..

Re: Stock 904 okay behind mild 340? #534271 11/23/09 08:28 PM 11/23/09 08:28 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: yup. 904's in heavy cars with some power not a good idea. unless you like shredded floorboards and your girlfriend beating on you saying [Edited by Moparts - Family Friendly Site - Keep it clean].. have yet to see a 904 come apart like a 727 ...been drag racing with the same 904 for 15 yrs. it has been rebuilt once in that time frame...because ring gear broke and took out rear spraq...and i have been using a trans brake on that 904 for 15 yrs... see 69 barracuda in signature 71 dart in signature has 904 with transbrake with 3 seasons on it.. and these are 904 with aluminum plantaires...not the 999 steel one... and i rebuilt both of them...and i am no expert. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Stock 904 okay behind mild 340? [Re: 70AARcuda] #534272 11/23/09 08:56 PM 11/23/09 08:56 PM
Joined: Apr 2007 Posts: 2,327 Glendale, AZ 6 69L78Nova Banned. Forever.
69L78Nova Banned. Forever. 6 Joined: Apr 2007 Posts: 2,327 Glendale, AZ	I ran 10.80s in a 63 Dart for 7 years with a 360 and a 904. Never had one problem with it 1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser 1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)

Re: Stock 904 okay behind mild 340? [Re: 70AARcuda] #534273 11/23/09 09:02 PM 11/23/09 09:02 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman pro stock
Wedgeman pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	So I would expect my 999 to hold up behind my stroked 5.9l magnum anytime ? Any mods needed as insurrance ? Dan

Re: Stock 904 okay behind mild 340? [Re: 70AARcuda] #534274 11/23/09 09:32 PM 11/23/09 09:32 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Quote: yup. 904's in heavy cars with some power not a good idea. unless you like shredded floorboards and your girlfriend beating on you saying [Edited by Moparts - Family Friendly Site - Keep it clean].. have yet to see a 904 come apart like a 727 ...been drag racing with the same 904 for 15 yrs. it has been rebuilt once in that time frame...because ring gear broke and took out rear spraq...and i have been using a trans brake on that 904 for 15 yrs... see 69 barracuda in signature 71 dart in signature has 904 with transbrake with 3 seasons on it.. and these are 904 with aluminum plantaires...not the 999 steel one... and i rebuilt both of them...and i am no expert. HEAVY cars. lets here how many people use stock or the usual hop-ups 904 trannys in say a 71 roadrunner, or a 68 charger. with a 300hp/340cid or better engine.. like already stated above. theres a reason why MoPar never put those in there performance lineup. Darts and A-body barracudas depite what you may think, are not heavy cars.

Re: Stock 904 okay behind mild 340? #534275 11/23/09 11:09 PM 11/23/09 11:09 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge enthusiast
Lil Wedge enthusiast L Joined: Aug 2007 Posts: 316 Ohio	I run 904's in both cars, the Cuda weighs 3700 lb, runs mid 11's(10.80 best)1.40 60' same trans since 02, The Dart is 3000 lb. Transbrake best of 9.80's 1.27 60' time, usually lasts whole season, nothin fancy in either, deep pan and manual valve body. Only broke one once(output shaft). 5623308-DARTINDY.jpg (36 downloads)

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