BB 727 Hi/Po vs Standard trans. difference?

Engine, Trans & Driveline

  1. RT68440

    RT68440 Well-Known Member

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    Hey guys, my '68 Charger R/T has the matching numbers 440 in it, but after running the numbers on the transmission, I see that it is out of a 1969 440 C Body. The number on the pan rail is 2892092 and it has the full VIN on the bell housing pad (engine code K). From my research, the correct trans number for my Charger should be 2801541. My question is, are there any differences from the standard 440 727s to the HiPo 440 727s? Thanks!
     
  2. monaco66coupe

    monaco66coupe Well-Known Member

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    The 440 2892092 transmission is a good trans. The original would be 2892093 for the HP version after 1 april 68. it was 2801541 for the 67' thru 68 thru march of 68. my mopar book shows the 440 standard had seven pinion gears,(four forward,three reverse, I believe) and the HP had eight, (4and 4) and a higher stall, (1900-2300)with a few other minor upgrades.( don't remember exactly what they were)

    I rebuilt a 2892092 to the HP specs, and it was easy.
     
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    • Yatzee

      Yatzee Well-Known Member

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      The planetaries had one extra gear on the hipo and the servo pistons were a bit thicker to keep them from going "cock eyed" under quick, heavy shifts. Some of the earlier trannys had a bad habit of ejecting the servo circlip if the servo piston didn't travel straight in the bores. Newer more modern pistons are as much as 1/2 inch thick. The newer trannys were used standard in some pickup trucks and built for that purpose - just a bit tougher were needed.
       
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      • monaco66coupe

        monaco66coupe Well-Known Member

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        It is always good to see more Information. My trans guy is 80 years old and was a chrysler sponsored NHRA racer(Hemi"s) from 67-73. . I just hand him the transmission, and say: make it work to the best. he is still kicking, but slower.
         
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        • RT68440

          RT68440 Well-Known Member

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          I see. My car has a SPD of April 15th of '68, so Im guessing that my car could have had either the 541 or the 093 trans. Id like to look for either one of the correct numbered transmissions, even if its just the case and build it to the HP specs.
           
        • monaco66coupe

          monaco66coupe Well-Known Member

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          Any 68-69 383 Roadrunner or superbee will have the transmission. any 67-69 HP Chrysler 440 will also have it.
           
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          • monaco66coupe

            monaco66coupe Well-Known Member

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            My 68' 383 has the Superbee transmission, as I put it in. Originally mine was a 383 2bbl. That transmission had only six pinions, and was not up to being pushed around.
             
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            • dvw

              dvw Well-Known Member

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              As long as it has a 4 friction front drum (easily swapped if not), 3.2, 3.8 or 4 lever the rest doesn't matter. Never had a servo issue. I run 3 pin planets. A well built stock 727 with a decent valve body will survive 600hp for a LONG time. A few mods and they will survive 900hp
              Doug
               
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              • AMX364

                AMX364 Well-Known Member

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                The 68 parts are very "old school" and were good for its time. Fluids, clutches(red and blue) and bolt in sprags are so much better now then ever before. Same with converters which you should talk to a expert about before ordering for best results.

                edit: the numbers matching transmission is gone, it will never be back. Try not to lose too much sleep over that loss.
                 
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                • oldbee

                  oldbee FBBO Gold Member FBBO Gold Member

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                  Here's a few pics from '68 FSM

                  IMG_0835.JPG IMG_0836.JPG
                   
                • Cranky

                  Cranky Banned Staff Member FBBO Gold Member

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                  You need to get your tranny guy :D to teach you how to build one. They are not hard to do but knowing the tricks is what makes them good......after all, he's not going to be here forever. Man, I hope I'm still able to get out of bed let alone build a trans when I'm 80 lol
                   
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                  • monaco66coupe

                    monaco66coupe Well-Known Member

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                    71he is a great guy! I took three to him last summer, but called ahead to be sure he was alive!
                    I had a crate hemi in my 67 GTX back in 2003, and had him build a trans for it. When I picked it up, he said he had put some interesting parts off his shelf to make it a hemi transmission. he refused to take money for the add ons, saying they had been on his shelf since 1972, and somebody should use them! So it is going into my 67 440 car, with a different torque convertor of course.
                    He raced a Hemi colt in the 70's.
                     
                    Last edited: Apr 24, 2017
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                    • oldbee

                      oldbee FBBO Gold Member FBBO Gold Member

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                      Monaco there's not too many of those guys around anymore, probably gave you a 5-disc frt. clutch like mine way back. Hemi drum was a little bigger for the extra disc& steel plate. Everyone now worries about extra friction losses from the extra weight,who cares; it has more grabbing power. Only did 2 myself,they're not hard if you have a FSM.
                       
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                      • oldbee

                        oldbee FBBO Gold Member FBBO Gold Member

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                        IF I remember right the torqueflight was originally conceived to handle 400hp(or less). Great design!
                         
                      • monaco66coupe

                        monaco66coupe Well-Known Member

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                        I vaguely remember something about bronze Bushings, and a bigger drum,with hemi having higher quality rolling parts.
                        One of those he did for me was for a 1970 383 Roadrunner. he took the time to have the Torque convertors made with the newest 90's parts in order to Improve the performance and longevity over the original 60's and 70's stuff, and had them designed to match the exact stall speed of the original equipment.
                        I still have the Hemi convertor, as I sold the crate motor.
                        he still resides in Clarion, Iowa.
                         
                      • oldbee

                        oldbee FBBO Gold Member FBBO Gold Member

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                        Monaco you are truly blessed! Cherish your buddy.
                         
                      • monaco66coupe

                        monaco66coupe Well-Known Member

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                        Thanks! he is gruff! He boils the case out, put told me right up front he doesn't care about those frissy rebuilders that polish up the cases and paints them. He told me if I want that go do it yourself! I build em to work! Just like in the day.
                         
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                        • oldbee

                          oldbee FBBO Gold Member FBBO Gold Member

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                          My kind of man!
                           
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                          • dvw

                            dvw Well-Known Member

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                            You don't need all the trick stuff. Even Rabestoes tan frictions, stock servos and 3 pin planets will all last for year's in a 10.50 car. The Hemi stuff is old scool heavy and expensive. Besides a good valve body or valve body kit your good to go. 4 friction front clutch, set at .060", early KD servo, 3.8 lever. If you're going to spend any money on aftermarket parts put a good billet front drum and race style sprages from Cope, A&A, TCI. This car runs stock 3 pin planet carriers, shafts, servos, pump gears. 1.240/9.04@148. On year 3 w/o rebuild.
                            Doug

                            0407131235.jpg
                             
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                            • RT68440

                              RT68440 Well-Known Member

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                              Ok, forgive me because I don't know jack about automatic transmissions. So basically everything internally that was upgraded in the hi/Po version of the 727s is pretty much what gets put in nowadays in a standard rebuild...And I can have my standard 727 rebuilt with better parts than the hi/Po versions had, correct? I just wanted to make sure that there wasn't anything different with the case itself like a thicker bellhousing, ECT...
                               
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