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Mitsubishi Diamante Transmission Questions and Issues

7 messages,  Last post on Mar 10, 2011 at 10:50 AM

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What is this discussion about? Mitsubishi Diamante, Sedan

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#1 of 7 Diamante transmission fixes/improvements by 97diamante

Aug 12, 2008 (5:11 pm)

Anybody find any way to hardened up the soft/slow shifting on the D trans?

#2 of 7 swapping transmissions by chanfle

Oct 01, 2008 (5:41 pm)

I blew the engine on my 1994 diamante, I then had problems finding a 1994 engine so I put in a 1995 engine. Does anybody know if I need a 1994 or '95 transmission?

#3 of 7 Re: Diamante transmission fixes/improvements [97diamante] by 377paul

Jul 21, 2010 (10:23 pm)

Replying to: 97diamante (Aug 12, 2008 5:11 pm)
the '97 had a new transmission that was only in that year. it was so bad they replaced mine 3 times for poor shifting, under warranty. I was later told by the district warranty manager that in '98 they added 14 parts. I don't know what, he wouldn't tell me. '98 shifted much cleaner but they "couldn't trade it in because of unnkow compatibility problems."
What helped my '97 some was to set the pressure regulator higher. it's under the trans pan. just a horizontal bolt pointing forward. don't overdo it. maybe one-two turns.
use Valvoline MAXLIFE ATF. it meets Diam specs and is cheaper.

#4 of 7 hard shift, sluggish take off by txrdlizard

Mar 07, 2011 (4:47 pm)

I have a 2001 Diamante, and after the shift to second gear(the hard shift), if I continue driving everything is fine until I come to a stop, then it seems to be slipping, but it isn't I thought it might be the modulator, but I found out this trans is not equipped with one. What else could it be???

#5 of 7 Re: hard shift, sluggish take off [txrdlizard] by 377paul

Mar 07, 2011 (10:22 pm)

Replying to: txrdlizard (Mar 07, 2011 4:47 pm)
need more info. 'slipping' in what gear? how did you get it to reach 2nd gear ? was it slipping in first and then not in second, third, fourth and lockup?
I expect I won't have an answer but we all need the problem well described.

#6 of 7 Re: hard shift, sluggish take off [377paul] by txrdlizard

Mar 08, 2011 (7:16 am)

Replying to: 377paul (Mar 07, 2011 10:22 pm)
when I first get in the car, reverse is fine, so is the shifting itself, shifts like normal, and the (hard shift) maynot come till third gear, depending on rate of acceleration. After the initial (hard shift)and returning to a complete stop, the next and all other accerlerations from 0 seem to be slipping until second gear then everything is fine. Had the fluid and filter service, this did not work, but because it is an electronic transmisssion, I am in thee process of checking all connectors, cleaning, and lubricating, will see what happens next. The speed sensor does not make the trans act this way, and there is one other sensor I have not checked yet either. hope this is better detailed, and any and all help would be appreciated.

#7 of 7 Re: hard shift, sluggish take off [txrdlizard] by 377paul

Mar 10, 2011 (10:50 am)

Replying to: txrdlizard (Mar 08, 2011 7:16 am)
I can't think of anything specific at the moment.
Did you use an approved fluid. Either Mitsubishi or (cheaper) Valvoline Maxlife.

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