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Thread: 46re vs 727

  1. #26


    madboy's Avatar
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    Quote Originally Posted by KyleDedrick View Post
    Hey Chris I'm doing the swap right now, just gathering a few more parts.

    The weight mixed with the loss of the Od unit is the biggest gain. Adobe gained massive Ben just with the stall change haha

    I'll be going from a stock 44re with a 3600 stalll to the 727 with around a 4000 9.5" converter and a transbrake
    Have you made some passes with your current setup?


    Josh - 98 BLK RC - Mad Milkshake Maker
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  2. #27

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    Tranny went for a shit soon as I got it out. With the changes I made this past winter, we anticipated our new time to be in the 13.8 are vs our old time of 14.51

    I installed the 3600/4bbl m1/4bbl tb with a tune but couldn't drag it.
    1998 Silver RC SLT - Hughes 2.02 Heads, Mopar M1 4bbl Intake, Mopar 4bbl TB, 230/236 .515/.515 on a 110, 1.6 Roller Rockers, 4.10's, Spintech Headers, 3" Duals, X Pipe, Chambered Mufflers, 4/4 Drop, 727 Full Manual w/Transbrake, PTC 4500 Stall


    12.90 at 104mph

  3. #28

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    Love to see the results Chris!

  4. #29

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    Quote Originally Posted by 98Dak408 View Post
    Love to see the results Chris!
    It will be interesting Richard. This is the truck we ordered that crossmember from you for. As always real nice parts!!!! Fits like a glove. This has been something I have been interested in for a while. I am yanking my 46 out this winter and installing a 727 but I don't really drive mine much. It is a double edged sword. The OD is great for a driver but when you get to the point where you drive the truck very little and you are looking for every last bit of power it has to go.

  5. #30



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    Quote Originally Posted by perfinj View Post
    It will be interesting Richard. This is the truck we ordered that crossmember from you for. As always real nice parts!!!! Fits like a glove. This has been something I have been interested in for a while. I am yanking my 46 out this winter and installing a 727 but I don't really drive mine much. It is a double edged sword. The OD is great for a driver but when you get to the point where you drive the truck very little and you are looking for every last bit of power it has to go.
    Richard's 727 cross member is the bee's knees.
    11.27 @ 118.23
    2017 NM Mopar Challenge Series Champion

  6. #31
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    You just dated your self Dave.
    1999 R/C Solar yellow

  7. #32



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    Quote Originally Posted by Mark View Post
    You just dated your self Dave.
    Ha ha...I did that on purpose, I Rarely say that, but like you, we know it's out there.
    11.27 @ 118.23
    2017 NM Mopar Challenge Series Champion

  8. #33
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    ive been thinking about a 904 swap, so im interested in seeing legit numbers here. any idea of ETA?

  9. #34



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    Quote Originally Posted by niebs View Post
    ive been thinking about a 904 swap, so im interested in seeing legit numbers here. any idea of ETA?
    727 is stronger and will last longer between freshening up.
    11.27 @ 118.23
    2017 NM Mopar Challenge Series Champion

  10. #35


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    904 has od

    Bad Luck Truck
    Current setup
    „R„block 429ci W5 heads 700hp N/A
    1/8 mile #'s 6.47@105 1.37 60’ 10.23@131

    Old 1/4 numbers below with 408
    Fastest N/A 2010,2011,2014
    477-RWHP ?-RWTQ

    11.244 ET @ 119.71mph N/A
    FOXHOLE RACING
    "If you like me good, if you hate me, even better!"
    Chris

  11. #36

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    Quote Originally Posted by krs1r/t View Post
    904 has od
    No.

  12. #37



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    Quote Originally Posted by krs1r/t View Post
    904 has od
    No.
    11.27 @ 118.23
    2017 NM Mopar Challenge Series Champion

  13. #38

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    C'mon krs get with the times haha
    1998 Silver RC SLT - Hughes 2.02 Heads, Mopar M1 4bbl Intake, Mopar 4bbl TB, 230/236 .515/.515 on a 110, 1.6 Roller Rockers, 4.10's, Spintech Headers, 3" Duals, X Pipe, Chambered Mufflers, 4/4 Drop, 727 Full Manual w/Transbrake, PTC 4500 Stall


    12.90 at 104mph

  14. #39


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    Quote Originally Posted by krs1r/t View Post
    904 has od
    lol
    - Josh

    2000 Solar Yellow R/T - Cam Only Truck
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  15. #40


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    Quote Originally Posted by Adobedude View Post
    727 is stronger and will last longer between freshening up.
    He speaks the truth - for the little gain you will get with the 904 over the 727 (if any) you should achieve longer life and similar results with the 727.


    Josh - 98 BLK RC - Mad Milkshake Maker
    Previous
    99 BLK RC - Mad Trash Hauler - sold
    99 DA RC - mad dak - Danno Stole it
    01 SLVR RC - mad sexy - retired - then died
    99 IB RC - mad RT - gone to heaven..



    Former Certified member of the 11 Second NA RT Club

  16. #41


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    Ford Trans for the win

    Bad Luck Truck
    Current setup
    „R„block 429ci W5 heads 700hp N/A
    1/8 mile #'s 6.47@105 1.37 60’ 10.23@131

    Old 1/4 numbers below with 408
    Fastest N/A 2010,2011,2014
    477-RWHP ?-RWTQ

    11.244 ET @ 119.71mph N/A
    FOXHOLE RACING
    "If you like me good, if you hate me, even better!"
    Chris

  17. #42

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    Where's new 1/4 mile times krs? Have you been lately?
    1998 Silver RC SLT - Hughes 2.02 Heads, Mopar M1 4bbl Intake, Mopar 4bbl TB, 230/236 .515/.515 on a 110, 1.6 Roller Rockers, 4.10's, Spintech Headers, 3" Duals, X Pipe, Chambered Mufflers, 4/4 Drop, 727 Full Manual w/Transbrake, PTC 4500 Stall


    12.90 at 104mph

  18. #43




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    904- no overdrive, smaller internally than 727 but use same valve body as 727

    999- same as 904 but has lock up torque converter and steel pinions and different first gear range, mostly in the trucks.

    998- same as 999 but shorter tail shaft and mostly used in cars

    a500/44rh- basically 904 with overdrive has lock-up and non-lock up versions use same valve body as a518/46rh but valve body doesn't interchange between lock-up and non lock-up versions ( there is a way to make them interchange but keeping this a simple explanation).
    Last edited by slammedR/T; 09-17-2015 at 09:18 PM. Reason: spelling and grammar
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  19. #44


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    Quote Originally Posted by KyleDedrick View Post
    Where's new 1/4 mile times krs? Have you been lately?
    No I really haven't been. 11.4's in heat of summer.
    I'm selling the 408 and bogarts

    Bad Luck Truck
    Current setup
    „R„block 429ci W5 heads 700hp N/A
    1/8 mile #'s 6.47@105 1.37 60’ 10.23@131

    Old 1/4 numbers below with 408
    Fastest N/A 2010,2011,2014
    477-RWHP ?-RWTQ

    11.244 ET @ 119.71mph N/A
    FOXHOLE RACING
    "If you like me good, if you hate me, even better!"
    Chris

  20. #45


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    I'm going to throw this out there. The hp and tq could be the same or a touch lower at the rear wheels bc the 727 is not locked up and running a true 1 to 1 the converter will slip a few percent skewing the numbers. In theory less rotating mass and weight is good and a 727 will be faster on the track but may fall short on the dyno. I think the main factor will be the tq converter and how efficient it is.


    Forged 408 12.10 @ 111mph under the knife again

  21. #46

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    Quote Originally Posted by slvr03dakrt View Post
    I'm going to throw this out there. The hp and tq could be the same or a touch lower at the rear wheels bc the 727 is not locked up and running a true 1 to 1 the converter will slip a few percent skewing the numbers. In theory less rotating mass and weight is good and a 727 will be faster on the track but may fall short on the dyno. I think the main factor will be the tq converter and how efficient it is.
    Agreed the converter has a lot to do with it. The lockup was shut off for the dyno pull with the 46 re and the converters are the same diameter and roughly the same stall speed. So the converters are matched pretty close that it should only be a few numbers. There is no exact way to really test this. Both the track and the dyno are just a close gauge.

  22. #47

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    So I wanted to post the findings of our 727 - 46 re swap. Our first step was to get a baseline on the truck. We warmed the truck up and made three back to back hits. We found 335 RWHP to be the average of all 3 runs. After installing the 727 we rolled the truck back on to the dyno. Again we warmed it up and made 3 runs. We found an average of 371 RWHP. That was roughly an 11% gain in power.

    That's a pretty decent gain in power. Think about this, on a truck that makes 600 RWHP that is a 66 hp gain at the tires. I can also say the truck feels a bit crisper than it did with the 46 in it. Driving down the road however with 3.92 gears and stock tire size 55MPH was 2,500 rpm and 60 MPH was an even 3000 RPM.

    The swap was pretty straight forward. We did use an automatic valve body which I did not like. I would recommend using a manual valve body. We did have to make some adjustments with the kickdown arm on the trans to get the trans to shift correctly at low speed without over traveling the arm at WOT. The parts that are needed are as follows, a new driveshaft, 727 slip yolk, plug for speedo gear hole, one of Hi-potek's trans cross member with trans mount and a torque converter that is for a 727 but uses a 90 degree cover for the standard flex plate. Oh and don't forget a tune to shut off the CEL or a manual trans computer.

  23. #48
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    11%. Not bad at all.

  24. #49
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    Very nice gains!
    410, 10.3 comp pistons, P&P Eddies, 254 cam, 30lb injectors, sct tuner, 3800 viper stall, 4:56 yukon gears, hotchkis tvs, m1 4brrl, 58mm f&b tb, 1.7 rr, electric fan, jm longtube headers, B&M hammer shifter, Cope Racing Trans, Viper Brakes, SRT8 Seats, nx wet kit(100 shot)
    best time 11.32 @ 118 1.59 60' on spray(old motor). 11.76@115 n/a(new motor)
    DD 07 SRT8 Charger 12.55@112

  25. #50



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    Good info, for track guys, it's WELL worth the effort, and I agree on the manual valve body.
    11.27 @ 118.23
    2017 NM Mopar Challenge Series Champion

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