2.8 to a 4.3 1988 s10 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 12-16-2007, 01:57 AM Thread Starter
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2.8 to a 4.3 1988 s10

I have a 1988 4x4 s10 I have to pull the engine to do some engine work and was thinking of putting a 4.3 in it. It has the 700r4 Auto , will a 4.3 out of a truck the same year be a bolt the engine in change the ecm(simple swap) ? I have heard the 4.3 and 2.8 have different bell housing bolt pattern. I am looking to buy a donor vehicle if I do the swap.
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post #2 of 4 (permalink) Old 12-16-2007, 02:52 AM
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Different bellhousings. 2.8 = 60* engine, 4.3 = 90* Your best bet is to find both engine and trans and swap both. There are 4.3 motor mounts available.
Also, I read that you should find the 4.3 battery tray and the radiator/fanshroud, too....so your idea of finding a donor is a good one.
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post #3 of 4 (permalink) Old 12-16-2007, 02:34 PM
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Additionally, with a donor vehicle, you will have any wiring you need. Other than computer wiring, these kind of swaps are not too big a deal. The computer wiring will go from the ECM to the motor, and is largely self contained, so you undo the harness, leave it on the motor, then hook it back up when you get to the recipient vehicle.

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post #4 of 4 (permalink) Old 01-03-2008, 02:38 AM
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I did the same engine swap,1988 s10 blazer 2.8 with a 5 speed manual to a 1993 4.3 230 hp with a 700r not a easy task! a donor vehicle is the only way to go. if you use a motor with a carb it is much easier to do. if you go with a FI motor you will need to change the whole wire harness under the hood and if you go with a newer model I think 90 and newer you will also have to change the wire harness under the dash along with the dash panel due to electronic speed control or buy and adapter that goes between the speed cable and trans jegs sells them. otherwise you could figure out what wire goes to what cut and splice. a Quick list - motor with pulleys, fan, oil remote or cooler, motor mounts, cross over, wire harness, battery tray, radiator, fan shroud, transmission, transmission lines, fuel lines from front frame, fuel filter put one by gas tank on frame, ecm, I recommend changing transfercase too. and turn torsion bars about 1 1/2 turns each to level out the truck. a 4.3 is heavier and will lower front end. If I had to do it all over again I would drop a 5.7 vortec in it
good luck if you need to know anything else please e-mail me
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