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Car Forum / Ford / Ford Cars / December 2006My 4r70w do the JackRabbit (from 1st to 2nd)
'owdy, '94 Tbird LX V8, 64k (90% city) mi. It always shifted hard from first to second. Doesn't actually clunk, but grabs 2nd real hard and fast. Like it's gonna break somethin' I was at a dealers years ago, mentioned it to the svc. mngr. He said his F-150 did the same thing and he just took his foot off the gas to get it to shift smoothly. I been doin' that for most of the 9 years I've been in possession of the beast. Is this "as good as it gets"? Do the newer 4r70w's do the same? If I nurse this tranny like a baby, what can I expect in the next 50k mi.? "4r70w" as a tranny "model" is still being bolted to (new) bell housings? TIA, Puddin' Pease pudding hot, Pease pudding cold, Pease pudding in the pot Nine days old ... > "4r70w" as a tranny "model" is still being bolted to (new) > bell housings? There have been alot of big improvements in that tranny since 1994. See http://www.tccoa.com tranny section for details >'owdy, > [quoted text clipped - 20 lines] > TIA, > Puddin' Hard to say how it will hold up but I think the original service manager lead you astray. It should never have been shifting like that and should have been fixed under warranty. >'owdy, > [quoted text clipped - 25 lines] >Pease pudding in the pot >Nine days old ... It is normally a very smooth trans. There have been numerous updates to improve reliability. It began life a pretty much nothing more than an AOD-E with the wide ratio gearset from the truck series to provide for better acceleration off the line. The shifting is controlled by the calibration of the valve body along with the electronics. If the trans was ever rebuilt, someone may have gone too far on the accumulator springs. IIRC, there was also an updated on the solenoid pack to improve this. The OD solenoid was updated to reduce or eliminate converter shudder on lockup. A good shop can check the pressures and see if it is in specs if it would make you feel better. Personally, I did all the updates when I rebuilt mine along with a shift improver kit. The trans is now smoothly firm becoming more aggresive as the acceleration gets harder as I like them. I did go a bit further that I intended on the 4th gear lockup after having installed both the large piston and band for better hold. The added pressure in that circuit can be a little distracting to the unknowing when it upshifts until it warms up. I haven't bothered to correct it even when it would have been easy while servicing the trans. Lugnut >>'owdy, >> [quoted text clipped - 20 lines] >> TIA, >> Puddin' >It is normally a very smooth trans. All of 'em? I somehow assumed all from that era shifted kinda hard 1st to 2nd, even with -very- little acceleration per the gas petal. Particularly when cold. >There have been >numerous updates to improve reliability. It began life a >pretty much nothing more than an AOD-E with the wide ratio >gearset from the truck series to provide for better >acceleration off the line. I knew it evolved from AODE. Was once told that 4r70w downshifted per PC (Process Computer), AODE downshifted hydraulically. >The shifting is controlled by >the calibration of the valve body along with the >electronics. When I replaced the MLPS a few years ago, iffen I asked for a PC for my '94, they'd sell me a PC for a '95. That told me a little tiny something about the electronics. :-) >If the trans was ever rebuilt, someone may >have gone too far on the accumulator springs. No rebuild. >IIRC, there >was also an updated on the solenoid pack to improve this. >The OD solenoid was updated to reduce or eliminate converter >shudder on lockup. A good shop can check the pressures and >see if it is in specs if it would make you feel better. Doesn't sound practical. Would expect too little accurate info for too much $. >Personally, I did all the updates when I rebuilt mine along >with a shift improver kit. The trans is now smoothly firm [quoted text clipped - 6 lines] >it even when it would have been easy while servicing the >trans. Ahh. That I should be in a position to perform such tranny service (I'm nowhere close). Cheers, Puddin' Pease pudding hot, Pease pudding cold, Pease pudding in the pot Nine days old ... >>>'owdy, >>> [quoted text clipped - 26 lines] >kinda hard 1st to 2nd, even with -very- little acceleration >per the gas petal. Particularly when cold. The operate word is "normally". Cold transmissions are known to shift 1-2 a bit hard. Can actually get mushy when hot. >>There have been >>numerous updates to improve reliability. It began life a [quoted text clipped - 5 lines] >downshifted per PC (Process Computer), AODE downshifted >hydraulically. Both are electronically controlled by the ECM. The AOD (no E) was the last of the hydraulically controlled. That does not mean hydraulic signals are not used internally. in the electronic units. >>The shifting is controlled by >>the calibration of the valve body along with the [quoted text clipped - 4 lines] >a '95. That told me a little tiny something about >the electronics. :-) IIRC, the big change n the electronics occurred fr the '96 model year including the control voltage. >>If the trans was ever rebuilt, someone may >>have gone too far on the accumulator springs. [quoted text clipped - 9 lines] >Doesn't sound practical. Would expect too little accurate info for >too much $. That is usually the case. Most of this is best done at overhaul or if needed for other reasons. >>Personally, I did all the updates when I rebuilt mine along >>with a shift improver kit. The trans is now smoothly firm [quoted text clipped - 9 lines] >Ahh. That I should be in a position to perform such tranny service >(I'm nowhere close). Not unless you are a brave advanced DIY'er willing to invest some time to learn and money for tools on what can be a crap shoot! Lugnut > Cheers, > Puddin' [quoted text clipped - 3 lines] >Pease pudding in the pot >Nine days old ... >>>>'owdy, >>>> [quoted text clipped - 30 lines] >known to shift 1-2 a bit hard. Can actually get mushy when >hot. I'll try it again on next 10+ mi. journey. >>>There have been >>>numerous updates to improve reliability. It began life a [quoted text clipped - 7 lines] > >Both are electronically controlled by the ECM. 100% ECM controlled shifting. Up and Down? So the -only- diff. AODE/4R70W is the wide ratio gearset? >The AOD (no >E) was the last of the hydraulically controlled. 100% hydraulically controlled shifting. >That does >not mean hydraulic signals are not used internally. in the [quoted text clipped - 11 lines] >IIRC, the big change n the electronics occurred fr the '96 >model year including the control voltage. So maybe the '95 superceded the '94, then the '96 superceded the '95 ... :-) The dealer wouldn't sell me a '94 MLPS (8 blade). Offered a '95 MLPS (12 blade), wanted extra $ to re-wire the harness. I bought an 8-blade at Auto Zone for $30. Looked OK and works fine so far. >>>If the trans was ever rebuilt, someone may >>>have gone too far on the accumulator springs. [quoted text clipped - 30 lines] >some time to learn and money for tools on what can be a crap >shoot! Even if I had tons of time and tools, I can't imagine being able to do heavy duty stuff without a lift, and thatun is in my po' budget nooooooooo time soon. Besides, the way my back is today, I'd do well to lift the floggin' groceries. :-) Skoal, Puddin' Pease pudding hot, Pease pudding cold, Pease pudding in the pot Nine days old ... > 'owdy, > [quoted text clipped - 25 lines] > Pease pudding in the pot > Nine days old ... See here: http://www.markviii.org/LOD2/part_numbers.htm#Spring http://www.markviii.org/LOD2/1_2_Accumulator_paper.htm |
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