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Unread 12-05-2011   #1 (permalink)
gotomgo is offline Apprentice

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Default trans compatibility/interchange 97 GT

i bought my old lady a 97 gt.it shifts goofy ,fairly certain its going bad. ive read on line that all those e40rw are the same .i asked my buddy at the junk yard to get me a trans he said there not interechangeable w mustangs. i know the older aods were shorter in mustangs. but thats on the older aods. any info would greatly be appreciated thanks
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Unread 12-05-2011   #2 (permalink)
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Who ever told you they are all the same does not know their stuff. While it's true that 4R70W's are similar, there are differences. Remember that the 4R70W is a PCM controlled transmission. Expect some issues if you were to install an older AODE.

The other difference is the speed sensor. 99+ Mustangs use a VSS sensor. 98 and older use a OSS sensor. The two sensors are NOT compatible with each other. The sensor used must match the wiring harness and the PCM.

Note, some interchange with other cars is possible. However, expect some differences in configuration.

For example, the 4R70W from a 97 Crown Vic/Grand Marquis/Town car will fit but the DTR sensor is pointing the wrong way. So if you are willing to swap the DTR sensor, it will work.

Other transmission may fit as well with a tail shaft swap.

In general, for a "plug and play" swap, try to stay as close as possible to the original model year.
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Unread 12-06-2011   #3 (permalink)
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thats all i was wondering. if could get a crown vic 40rw or a truck one etc.. thanks. any more info is greatly appreciated
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Unread 12-06-2011   #4 (permalink)
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swaping the trans range sensor is not a big deal.i have just benn looking on craigslist for used trannys and the crown vic ones seem plentyful. other than the range sensor is tail shaft length the same>?
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Unread 12-06-2011   #5 (permalink)
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why don't you let a transmission shop give you an honest evaluation? Also probably better in the long run just to rebuild what is there rather than play hit and miss with junkyard..well, junk
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Unread 12-06-2011   #6 (permalink)
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Quote:
Originally Posted by gotomgo View Post
swaping the trans range sensor is not a big deal.i have just benn looking on craigslist for used trannys and the crown vic ones seem plentyful. other than the range sensor is tail shaft length the same>?
As stated before, the exact combination of original and donor needs to be known.

How about the low tech approach.?Measure the length of your car's tail shaft. Compare that measurement to the donor transmission. Do the match? If not, a tail shaft swap is necessary.

As for the advice about getting a transmission from a junk yard. Depending upon your expectations and who's doing the work, the replacement transmission may very well be worse off than the one you have.

Obviously if you are doing the swap yourself, then the labor is free.

IMO, anyone that is paying to have the transmission swapped should consider taking 2Manystangs advice and have a transmission swap give you an estimate. This avoids all of the possible interchange issues should the donor unit not be from the same model/model year.
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Unread 12-07-2011   #7 (permalink)
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true about the tail shaft. If you're willing to upgrade, IMO, get transmission upgraded to 1998 mustang specs (mechanical diode, clutches, etc.) except for transmission wiring connections because you will have to use originals. While you're at it, do a J-MOD on separator plate! Avoid the shift kits.
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Unread 12-07-2011   #8 (permalink)
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Quote:
Originally Posted by wmburns View Post
... The other difference is the speed sensor. 99+ Mustangs use a VSS sensor. 98 and older use a OSS sensor. ...
wmburns:

Point of clarification, respectfully submitted:

The pre-99's use vehicle speed sensor and output shaft sensor. The +99's use the OSS only.



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Unread 04-11-2012   #9 (permalink)
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overdrive clutch burnep few weeks ago
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Unread 04-11-2012   #10 (permalink)
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got a trans out of a 96 gt w a warranty from mustang performance for $399 (low mileage used) went to put it in ,wouldnt fit ,the studs on converter were spaced different than those on my 97 . so i had the converter flushed outa my 97 and re installed that on the 96 trans. works great
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