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Username Post: SB 350 to 454 BB        (Topic#350428)
Forum Newbie
Posts: 4

Age: 54
Loc: Utah
Reg: 03-26-18
04-03-18 06:31 AM - Post#2729775    

I don’t know if I’m in the right section but I’ll ask this anyway. My son wrecked my 94 K2500 a week ago, and I picked up a 96 K1500 as a parts truck. I’m going to use the cab and clip from the 96 to rebuild my 94. My 94 has obd2 as well as the 96 , the only thing I can think of that’s different might be the programming in the computer. The 94 has a 454 and the 96 has a 350 . Will I have to change out the wiring harness in the 96 for the 94 ? And use the computer that came on the 94 ? Years ago I changed out a 454 for a 350 but both engines were from the same year 95 . Thanks for any input and advice.


Valued Contributor
Posts: 3152

Age: 47
Loc: West Michigan
Reg: 02-18-12
04-03-18 02:53 PM - Post#2729831    
    In response to DirtyD67

A 94 with OBD2? Are you sure? There were some vehicles with OBD2 style connectors that were OBD1, could that be what you have? A 94 will be TBI, and the 96 will be a Vortec engine, so the you'll be moving wiring.

99 K3500 RCLB

Forum Newbie
Posts: 4

Age: 54
Loc: Utah
Reg: 03-26-18
04-04-18 04:43 PM - Post#2729949    
    In response to 454cid

Ok thanks , just added a month to my rebuild schedule, I only have weekends to work on it. But I know what I’m up against now thanks. I just hope that the connector for the instrument cluster is the same because I’d like to keep that dash style in the truck if I could. If not everything inside my 94 cab is in perfect condition just the outside got fubar !! Thanks for the info have a great day

"9th Year" Silver Supporting Member
Posts: 4413
Loc: Salt Lake City
Reg: 06-20-09
04-04-18 05:41 PM - Post#2729956    
    In response to DirtyD67

The only way a '94 has OBD2 is if someone already transferred an OBD2 system over. The '94 came stock with OBD1.

You will need a 5.7 PROM chip with same transmission.


'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


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