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Unread 07-03-2019, 01:49 AM   #1 (permalink)
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Question #-speed auto to 4-speed auto transmission swap

I have a1994 Suzuki Samurai with a 1994 Geo Tracker twin cam 1.6l engine and 3-speed automatic transmission. I desire to swap for a 4-speed auto transmission out of a 1998 Geo Tracker. I can obtain transmission with wiring, complete floor shifter with linkage, center counsel, but not the cars computer.

Can anyone tell me if I need the computer out of a 5-speed 4x4 auto, or if the computer for the 3-speed, I have in the car will work? Also what other problems can I expect? Will the transmission spline be the same on the transmission out of my 1.6 liter as on the transmission for the newer 1.8l engine? If necessary I may be able to get the computer out of a 1997 Sidekick sport, will this work with the transmission out of the 1998?
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Unread 07-03-2019, 01:58 AM   #2 (permalink)
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Quote:
Originally Posted by RMPowell01 View Post
I have a1994 Suzuki Samurai with a 1994 Geo Tracker twin cam 1.6l engine and 3-speed automatic transmission. I desire to swap for a 4-speed auto transmission out of a 1998 Geo Tracker. I can obtain transmission with wiring, complete floor shifter with linkage, center counsel, but not the cars computer.

Can anyone tell me if I need the computer out of a 5-speed 4x4 auto, or if the computer for the 3-speed, I have in the car will work? Also what other problems can I expect? Will the transmission spline be the same on the transmission out of my 1.6 liter as on the transmission for the newer 1.8l engine? If necessary I may be able to get the computer out of a 1997 Sidekick sport, will this work with the transmission out of the 1998?
you need the computer for the 4 speed transmission you are fitting, a 5 speed computer will not work, and even ones between 4 speed model years may not work.

Wiring will also be needed.


What engine is the 1.8 you are talking about? if its what i think it is, it won't fit the 3 speed engine block
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Unread 07-03-2019, 04:25 AM   #3 (permalink)
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Welcome to the forum.
Yes, you need to computer, as the transmission in the 4 speed shifts electronically, by computer. And the 4 speed tranny is longer, as well, so it’s not a bolt in swap either.
Post #2 here indicates what you’d need to do:
https://www.suzuki-forums.com/suzuki...sion-help.html

More importantly, I’d like to know where you were able to find a ‘1994 Geo Tracker TWIN CAM engine’. I don’t believe there is such a thing.
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Unread 07-10-2019, 02:16 PM   #4 (permalink)
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The only thing I have been able to obtain so far is the wiring and the computer from the 97 Sidekick sport. If the computer from one model year may not work with the transmission from another year, than I guess I should be looking for a wrecked 1995+ 4x4 1.8l automatic car to use for my desired project.

My current engine is not a twin cam. Just a 16 valve. I have an old Cosworh Vega 16 valve engine and it is a twin cam so in my head 16 valve 4-cyclinder is twin cam. What I have is just the normal 1.6l 16 valve engine.
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Unread 07-10-2019, 02:17 PM   #5 (permalink)
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Thank for the link. It was helpful
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Unread 07-10-2019, 06:14 PM   #6 (permalink)
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You're going to have to start paying more attention to detail - you have a 1.6, 16v engine, you need the wiring & computers from a 1.6, 16v with the four speed transmission - note I said computers, if I remember correctly, the 1.6 with the four speed had a separate transmission control unit. The 1.8 wiring & computer wont work with your 1.6 engine.
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Unread 07-11-2019, 05:23 AM   #7 (permalink)
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Swapping from a 3 speed auto to a 4 speed auto (and pay attention to Fordemís post above - a Suzuki Sport is an entirely different vehicle), will also be problematic as the 4 speed transmission is longer than whatís in your car. You will need other modifications to fit that tranny in, even aside from getting the harness and computer. Frankly, I donít really think that this is worth the bother. The 3 speed tranny is a real workhorse, and often more dependable than the electronic 4 speed. I donít see much of a gain from this swap.
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Unread 07-11-2019, 05:56 AM   #8 (permalink)
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Bex has raised an interesting point - to run either the three or four speed Sidekick automatic in a Samurai, presumably coupled to the Samurai transfer case, requires the Sidekick transfer case to be removed and some sort of adapter fitted - I've heard of it being done with the three speeds, and these adapters are available off the shelf, I'm not certain that this is so for the four speed.
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Unread 07-11-2019, 01:48 PM   #9 (permalink)
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Okay, Thank for the info on what I need to locate. Wiring and computers from 1.6l, 16v 4 speed auto transmission and transmission. Now I need to figure out what models and years have this engine and transmission.
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Unread Yesterday, 11:40 AM   #10 (permalink)
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All of the 4 door Suzuki Sidekicks will have this from 91-98.
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