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Tranny Swap #2646589
04/18/19 07:37 PM
04/18/19 07:37 PM
Joined: Jun 2005
Posts: 1,534
Florida
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CHRGR69 Offline OP
pro stock
CHRGR69  Offline OP
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Joined: Jun 2005
Posts: 1,534
Florida
89 Dakota 3.9 2WD. Can I put a 3 speed in place of the 4 speed?


Grandma always said I had "hands of gold"!
Re: Tranny Swap [Re: CHRGR69] #2646628
04/18/19 09:50 PM
04/18/19 09:50 PM
Joined: Jan 2003
Posts: 32,882
Grand Prairie,Texas
stumpy Offline
I Win
stumpy  Offline
I Win

Joined: Jan 2003
Posts: 32,882
Grand Prairie,Texas
I have a dumb question stick or auto?

Re: Tranny Swap [Re: stumpy] #2646637
04/18/19 10:15 PM
04/18/19 10:15 PM
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Posts: 1,534
Florida
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CHRGR69 Offline OP
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CHRGR69  Offline OP
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Florida
Not dumb. Auto


Grandma always said I had "hands of gold"!
Re: Tranny Swap [Re: CHRGR69] #2646642
04/18/19 10:21 PM
04/18/19 10:21 PM
Joined: Jan 2008
Posts: 2,195
ILLINOIS
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volaredon Offline
top fuel
volaredon  Offline
top fuel
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ILLINOIS
replace a 4 speed with a 3..... why? I have gone the opposite way before on an 88 D100.

Re: Tranny Swap [Re: volaredon] #2646654
04/18/19 10:59 PM
04/18/19 10:59 PM
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Posts: 1,534
Florida
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CHRGR69 Offline OP
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CHRGR69  Offline OP
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Florida
Just asking because I'm coming across them more often than the 4 speeds.


Grandma always said I had "hands of gold"!
Re: Tranny Swap [Re: CHRGR69] #2646662
04/18/19 11:42 PM
04/18/19 11:42 PM
Joined: Jan 2003
Posts: 10,483
Freeport IL USA
poorboy Offline
I Live Here
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Posts: 10,483
Freeport IL USA
You can, but the 4 speed auto is longer then the 3 speed auto of the same size (904/A500 or 727/A518).
My luck with used automatic transmissions aren't very good. I would spring to have the one you have rebuilt, or buy a rebuilt trans from an online source. Gene

Re: Tranny Swap [Re: poorboy] #2648784
04/25/19 11:12 AM
04/25/19 11:12 AM
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Posts: 1,534
Florida
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CHRGR69 Offline OP
pro stock
CHRGR69  Offline OP
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Joined: Jun 2005
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Florida
Originally Posted by poorboy
You can, but the 4 speed auto is longer then the 3 speed auto of the same size (904/A500 or 727/A518).
My luck with used automatic transmissions aren't very good. I would spring to have the one you have rebuilt, or buy a rebuilt trans from an online source. Gene


That's what I'm leaning towards.


Grandma always said I had "hands of gold"!
Re: Tranny Swap [Re: CHRGR69] #2650364
04/29/19 09:31 PM
04/29/19 09:31 PM
Joined: Dec 2005
Posts: 1,149
Cruising!
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QuickDodge Offline
super stock
QuickDodge  Offline
super stock
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Joined: Dec 2005
Posts: 1,149
Cruising!
I haven't attempted such a swap, but suspect it could be done. Some parts swapping and perhaps a bit of minor fabrication may be required. The older 904's had mechanical speedometer drives. I think the transmission mounts may be in different locations. No idea how the computer would react to the transmission swap.

Some people buy a manual or video and rebuild the transmission themselves. The 3 speed transmission are rumored to be easier to rebuild than the overdrives.

With the 3 speed transmission, you may want to consider changing the rear axle ratio if you plan to drive it on the highway.

Personally, if it was my truck and the money was available, I'd follow Gene's recommendation!







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