5.3l or 6.0l into a 94

[1994silverado]

New to the site but of all of the posts for this swap I have read through I haven't seen anybody that used there original auto tranny. I want to swap a 6L or a 5.3 into my 94 because I am sick of the tbi causing problems and not getting the power I want. But I don't have alot of money and I would rather keep my known good tranny that is in the pickup. Would either of these engines wiring plug into and run my factory transmission or could i change the plug on the harness out to the old plug and run it. Also would the torque converter bolt to the newer engine flywheel or would I need a different torque converter. Also the pickup is a 4 wheel drive and I don't want to get different driveshafts or anything else just a engine I can bolt up to the tranny were it sits and change what I need to under the hood to make it run. Any help would be appreciated Thanks

[slow94]

on my 2 wheel drive 94, I used the dirty dingo motorsports adjustable mounts, I just left the trans bolted to the crossmember and supported it with 2x4's and a jack, then bolted the engine to the trans and let it drop into place. I would think the 4wd would be similiar. You can physical bolt engine to old-style trans with the 6.0 flexplate that has the built in spacer, you might have to elongate the converter holes. I swapped mine over to a 97 4l80e a few years ago and it bolted straight up. As far as the electronics go, I know the 94 is a non-pwm trans and only has a tcc on/off solenoid, where nearly everything 95 and later is pwm and have a tcc on/off and a tcc pwm solenoid, other than that I can't really help with that part.

[Jaredp]

I'm in a similar situation as he is, so what transmissions will work with a LS engine? I assume whatever came with it factory, but will there be some kind of trouble code, say if you ran a '05 5.3 with a '99 4L80e ? You mentioned a few abbreviations that I am unfamiliar with such as: pwm tcc. what are those?

I think you drive shaft question has a lot to do with your trucks layout ( Extended cab or regular, short box or long)

Thanks for the great info!

[Jaredp]

This link is gold.

http://www.lt1swap.com/all_lt1.htm

[slow94]

I think with proper programming, you could run 4l60e, 4l65e, 4l80e, T5, T56, and the NV3500/4500. Some will require a spacer depending on the year model.
TCC=Torque Converter Clutch PWM=Pulse Width Modulation

I have a 97 4l80e behind my 05 5.3, So I can guarantee thats doable. I had to buy a flexplate from crateenginedepot.com, it came with the spacer and 6 correct length bolts for around $50. then I just found a BIN file for a 6.0/4l80e and tweeked it for the 5.3 and flashed it in using efilive. I've finished the swap, but still need to tidy up the wiring and run some exhaust. The problem is, I just bought a 94 fullsize blazer that I am much more excited to work on, so the 94 truck is gonna be on the backburner for a little longer.

[1994silverado]

Thanks for the info. Whats a decent price for a 6.0? I found one locally for $1,000 with everything but a starter and 92,000 miles but that seems alittle high to me. I could also get the tranny for it for $800 but that's way more than I would pay for a tranny with 92,000 miles.