can I switch my 1996 k1500 305 motor and tranny for a 350

Asked by May 22, 2015 at 10:33 PM about the 1996 Chevrolet C/K 1500 Silverado Standard Cab SB

Question type: Car Customization

I bought a 96 k1500 4x4 with a bad tranny and now the head gasket went, I don't feel like repairing it has 230000 but I cant find a decent 305. I found a 97 with a rotted frame but motor and tranny have 127000. I wanted to know if I do change over will I need to change the harness and the computer

14 Answers

97,005

To make sure everything will work you will have to do that.

1 of 1 people found this helpful.
18,785

It's all the same. If it's a 350 go ahead and take the computer so it's programmed for one.

1 of 1 people found this helpful.
1,555

All Chevy bolt patterns are the same. Different engines & transmitions bolt togeather, & most use the same motor mounts too. Use everything that goes with 97' engine too. 350 for a 305 is a good choice.

1 of 1 people found this helpful.
26,115

5.0 and 5.7 used the same ECM The 5.0 pcm will not lean out the 5.7 engine at all. the 02 sensors will correct the fuel mixture and you will not have any trouble with running what you have already. The only reasone you would need to make any mods to the pcm or the wire harnss would be if you where going from a 4.3 to a 5.7.

1 of 1 people found this helpful.
18,785

Your telling me a pcm programmed to an engine flowing 305 ci worth of displacement that uses a MAF sensor isn't going to tell a difference in another 45 ci of displacement? The maf reading alone will be different, the fuel trim tables will be too lean. It will run, no doubt about that but it won't be right.

1 of 1 people found this helpful.
26,115

yep. gm says there both in the same parametersFYI... several GM trucks use the same 16197427 ECM for 5.0 and 5.7 just change out the chip if you want.. CHEVROLET ASTRO (1994 - 1995) CHEVROLET BLAZER (1994 - 1995) CHEVROLET C1500 PICKUP (1994 - 1995) CHEVROLET C2500 PICKUP (1994 - 1995) CHEVROLET C2500 SUBURBAN (1994 - 1995) CHEVROLET C3500 PICKUP (1994 - 1995) CHEVROLET EXPRESS 1500 1996 CHEVROLET EXPRESS 2500 1996 CHEVROLET G10 (1994 - 1995) CHEVROLET G20 (1994 - 1995) CHEVROLET G30 (1994 - 1996) CHEVROLET K1500 PICKUP (1994 - 1995) CHEVROLET K1500 SUBURBAN 1995 CHEVROLET K2500 PICKUP (1994 - 1995) CHEVROLET K3500 PICKUP (1994 - 1995) CHEVROLET P30 (1995 - 1997) CHEVROLET S10 BLAZER (1993 - 1994) CHEVROLET S10 PICKUP (1993 - 1995) CHEVROLET TAHOE 1995 GMC C1500 PICKUP (1994 - 1995) GMC C1500 SUBURBAN (1994 - 1995) GMC C2500 PICKUP (1994 - 1995) GMC C2500 SUBURBAN (1994 - 1995) GMC C3500 PICKUP (1994 - 1995) GMC G1500 (1994 - 1995) GMC G2500 (1994 - 1995) GMC G3500 (1994 - 1996) GMC JIMMY (1993 - 1995) GMC K1500 PICKUP (1994 - 1995) GMC K2500 PICKUP (1994 - 1995) GMC K2500 SUBURBAN (1994 - 1995) GMC K3500 (1994 - 1995) GMC P3500 (1995 - 1997) GMC SAFARI (1994 - 1995) GMC SONOMA (1993 - 1995) GMC YUKON (1994 - 1995).

10

Can I put a 1995 Tahoe motor in my 1990chevy k1500?

1 of 1 people found this helpful.
18,785

Yes

10

Is the wiring harness the?

18,785

Yes, as long as they are the same engine size you'll be good. Going v6 to v8 would be alittle more involved. And switching from a 305 to 350 will be plug and play but I would advise the appropriate pcm to go with the motor

I've got a brand new 2000 350 long block what do I need to do to make it work in my1993 truck

10

I just bought a 98 chevy silerado 1500 305 5.0 liter v8 vortec had a lower end knock so i bought a 96 gmc with a 350 5.7 liter v8 vortec for the motor. The swap went good and everything bolted up and plugged in without any problems.To save time, fluids, and a/c recharge i left the power steering pump and a/c compressor lines hooked up, i just unbolted them from the motor and pulled them out of the way. I removed the distributor for access to the top bell housing bolts. DO NOT TURN THE CRANKSHAFT WITH THE DISTRUTOR OUT unless you want to reset the timing. After i got everything bolted down and plugged and fluids in it, it started no problem. After driving it a week now, i believe the ecm/pcm has not learned the difference from the 305 to the 350. I hear it backfiring when im coasting and the motor cuts out and picks right back up randomly while driving. Im looking into having my ecm reprogrammed locally or maybe getting a ecm from scrap yard for the 5.7 and flashing it to my vin#. Any advice on the ecm would be great. Hope this helps anyone considering swapping from 305 to 350.

1 of 1 people found this helpful.

Yes ,I got a 93chevy 1500,came with a 4.3v6 ,so I yank it out and put a350,5.7,do I have change the computer, or the chip,to make it run.Ann were is it located?

What will I have to do to swap a 4.3 to 7.4 in my 1996 K1500 4x4? I know I will need the wiring harness and the ecm. I want to use my existing 5 speed transmission.

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