Re: 727 vs. 518
[Re: hudsonhornet7x]
#1924864
10/03/15 01:27 PM
10/03/15 01:27 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Looking for some understanding here fellas- I have read that the 518 is an overdrive version of the 727. To me then I would assume that the 518 is just as strong as a 727. Is this true? If not, why? The front part is as strong if not stronger.. the rear(the OD section) wont take a ton of torque being that a 800# spring pressure applies the OD.. but if you are racing it the OD would be turned off... I keep the OD switch turned on all the time.. lacking any track time... the 518 is 47# heavier than the 727 and it has a bit larger case in front and is longer EDIT The coolant lines are 3/8 on the 518.. 5/16 on the 727
Last edited by MR_P_BODY; 10/03/15 01:30 PM.
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Re: 727 vs. 518
[Re: hudsonhornet7x]
#1924880
10/03/15 01:51 PM
10/03/15 01:51 PM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
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Posts: 10,847
Oakdale CT
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Do you have to manually toggle the overdrive each time, or will leaving the switch turned on allow it to work like the overdrive in my daily driver?
Sorry for all the questions just want to be informed.
Here is a circuit I made to activate mine. Gary
"I think its got a hemi"
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Re: 727 vs. 518
[Re: hudsonhornet7x]
#1924886
10/03/15 02:01 PM
10/03/15 02:01 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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First you would need to use the RH version of the 518 instead of the RE(the E is the electronic version).. you can find 2 types of the RH.. if you look at the OD plug located behind the shift lever on the case.. there is a 2 pin or a 3 pin plug... some early ones had a single pin... but you dont want the 7 pin plug... that uses the computer to operate the trans... I have both a 2 pin and a 3 pin... the 3 pin is a OD and lock up... I changed out the input shaft and the pump to allow the use of a 727 conv.. I have a 727 5000 stall in mine... this will eliminate the lock up.... I use a manual toggle switch to run the OD.. if you leave it on, when it hits 3rd gear it will go into OD.. turn it off and its a 727... without the lock up in it I leave the switch on unless I'm gonna race it EDIT If you run a lock up conv then you have to turn that off when coming to a stop or it will try to stall or lug... but the lock up conv isnt strong(the lock up clutch is small) and to get a lock up conv built with any decent stall is pricey
Last edited by MR_P_BODY; 10/03/15 02:07 PM.
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Re: 727 vs. 518
[Re: MR_P_BODY]
#1924914
10/03/15 02:50 PM
10/03/15 02:50 PM
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Joined: Jan 2003
Posts: 25,902 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,902
Rio Linda, CA
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the rear(the OD section) wont take a ton of torque being that a 800# spring pressure applies the OD.. It's the other way around, the spring applies the direct clutch which provides through-drive when not in OD so the torque capacity in direct is limited by the spring. The OD clutch is applied hydraulically so the OD clutch apply pressure can be manipulated.
The INTERNET, the MISinformation superhighway
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Re: 727 vs. 518
[Re: John_Kunkel]
#1924916
10/03/15 02:54 PM
10/03/15 02:54 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Ok... I wondered if I wrote it backwards... but either way that clutch cant take a ton of torque.. its small
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Re: 727 vs. 518
[Re: savoy64]
#1924925
10/03/15 03:09 PM
10/03/15 03:09 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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i think the clutches in the overdrive are the same ones as used in the main transmission--diesel ones have only one more clutch in the OD and everything else is the same--wonder how they hold up so well..... When you roll into the power it kicks out of OD.. in my parts book it calls out different P/N for the OD clutch
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Re: 727 vs. 518
[Re: teflon]
#1924937
10/03/15 03:23 PM
10/03/15 03:23 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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PATC sells many upgrade parts for the 518 such as extra capacity clutch packs. I got some of my parts from them... a lot of the stuff I get at the local Transtar(which has bought out most everyone)
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Re: 727 vs. 518
[Re: MR_P_BODY]
#1924954
10/03/15 03:42 PM
10/03/15 03:42 PM
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Joined: Aug 2003
Posts: 4,988 new jersey usa
11secdart
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master
Joined: Aug 2003
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new jersey usa
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I have the 518 in my 92 D150 which I bracket race on occasion, when racing I always push the o/d off button on the dash if I don`t it goes into o/d which slows the truck quite a bit. I have a Mopar Performance/ Turbo-Action shift kit , the 1st to 2nd shift is quite hard even under normal driving but it works well. I was going to add an off the shelf convertor to try and get the truck to leave better, instead Lenny at Ultimate said he could rework my stock lockup convertor which he did and the truck responded well although it only runs low 15s my 60ft times dropped from high 2 teens- low 2 twenties to low/ mid 2.0s a little over a tenth.
Last edited by 11secdart; 10/03/15 03:47 PM.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV
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Re: 727 vs. 518
[Re: 11secdart]
#1924963
10/03/15 03:49 PM
10/03/15 03:49 PM
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Joined: Aug 2003
Posts: 4,988 new jersey usa
11secdart
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master
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new jersey usa
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I have the 518 in my 92 D150 which I bracket race on occasion, when racing I always push the o/d off button on the dash if I don`t it goes into o/d which slows the truck quite a bit. I have a Mopar Performance/ Turbo-Action shift kit , the 1st to 2nd shift is quite hard even under normal driving but it works well. I was going to add an off the shelf convertor to try and get the truck to leave better, instead Lenny at Ultimate said he could rework my stock lockup convertor which he did and the truck responded well although it only runs low 15s my 60ft times dropped from high 2 teens- low 2 twenties to low/ mid 2.0s a little over a tenth.
Last edited by 11secdart; 10/03/15 05:28 PM.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV
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Re: 727 vs. 518
[Re: 11secdart]
#1924968
10/03/15 04:00 PM
10/03/15 04:00 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have the 518 in my 92 D150 which I bracket race on occasion, when racing I always push the o/d off button on the dash if I don`t it goes into o/d which slows the truck quite a bit. I have a Mopar Performance/ Turbo-Action shift kit , the 1st to 2nd shift is quite hard even under normal driving but it works well. I was going to add an off the shelf convertor to try and get the truck to leave better, instead Lenny at Ultimate said he could rework my stock lockup convertor which he did and the truck responded well although it only runs low 15s my 60ft times dropped from high 2 teens- low 2 twenties to low/ mid 2.0s a little over a tenth. So you have just a bit over stock stall... I checked into a lock up high stall conv.. 5000 stall and it was $1800 for a conv.. and he didnt know if the LU clutch would live... he wanted to make it about a 1" thicker so I would have needed a 1" spacer between the engine and trans... most of the conv places that I talked to wanted to go thicker if I wanted the stall I was looking for... right now I'm using the old J-conv from T/A and when I talked to Paul about the slippage it didnt know for fact what it would be in OD... he said 10%... he was close... its 9% at 75 mph.. I havent seen any issue with trans temp.. I normally see about 180* on a long run(75 miles or more).. but I run a nice size cooler.. and if I needed more I have another with a fan that I would add to it also EDIT This slippage data was when I was still having issues with the trans.. it was eating itself up due to no torrington bearing in the OD.. so I will need to do a new set of numbers since this last time of going through the trans.. I expect it to be better now
Last edited by MR_P_BODY; 10/03/15 04:06 PM.
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Re: 727 vs. 518
[Re: MR_P_BODY]
#1925021
10/03/15 05:20 PM
10/03/15 05:20 PM
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Joined: Aug 2003
Posts: 4,988 new jersey usa
11secdart
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master
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Yes Mr P a little better than stock and it was only a few hundred dollars to convert my stock convertor. Off course I don't have much power just a 5.2/ 318 with a few bolt ons and 4.10 gears. Is the 518 in your trick Rampage?
Last edited by 11secdart; 10/03/15 05:27 PM.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV
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Re: 727 vs. 518
[Re: 11secdart]
#1925027
10/03/15 05:28 PM
10/03/15 05:28 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Romeo MI
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Yes Mr P a little better than stock and it was only a few hundred dollars to convert my stock convertor. Off course I don't have much power just a 5.2/ 318 with a few bolt ons and 4.10 gears. Is the 518 in your trick Rampage? Yes it is... I finally have it working right.. I had issues with the rebuilds( 3 times before... so I finally did it myself) and it seems to be fine... it has all the gears now but I havent put it on the road as of yet on the build.. now it has injection on it also which is working nicely(Holley multi point)
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Re: 727 vs. 518
[Re: 11secdart]
#1925114
10/03/15 07:46 PM
10/03/15 07:46 PM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
top fuel
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top fuel
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Posts: 1,751
Graham, WA
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You have a sweet looking '92 and 15s are respectable for what you have and in bracket racing, if your vehicle can repeat and you cut the light, you win.
My '87 D100 will have the Dana 60-2 in place by the spring time with the 4.10 PowerLock. I have the original 318/727 with an E-brock Performer and a #1406 E-Brock on top and it feels strong though it has never been to the strip...yet. It was planned to be my tow vehicle for the Ramcharger, but I may be using it in next years Car Club Challenge while I work on the Ramcharger and I may want to upgrade to a 518 like you have for the gas mileage, but I only have to drive 20 miles to Pacific Raceway and a little farther to Bremerton Raceway, so with a real tall tire it probably won't make any real difference. I have a fresh 3,000 stall 727 converter and a used Hemi converter that I can experiment with. I just love working with junk.
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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