djm2475

Starting to aquire parts to complete my swap..Here is some of my questions
that i need help with; what trans should i use? 700r4,4l60,4l65.4l80? Now the outher question is about fuel pumps; I am thinking about a in-line since i have dual tanks. what should i use? Thank you

Bo185

What transmission/transfer case do you have? If you have a 7004r/NP208 or other transfer case just keep the 700r4 and transfer case the 5.3L will bolt-up to it.

You should be able to swap to an intank pump pretty easily because that body style had intake pumps with the the TBI units just need the correct pump for correct output pressure you would need two of the but the inline would be easier..

lsxyj

iTrader: (1)

the 5.3 will bolt to the 700 but u will need a differnt flywheel and toruqe converter hub adapter u can get them from huges transmissions

LS1MCSS

iTrader: (18)

If the 5.3 has a DBW throttle body, you will have problems keeping the 700-R4 alive. You have to have a throttle valve cable to run that tranny. If you can find an electronic tranny that will bolt up to your transfre case, you will be better off.

lsxyj

iTrader: (1)

u will need the newer 4l60 because the 5.3 computer will have trouble running the older 4l60

djm2475

Thankyou for all your great replys.. It looks like im gonna find a newer trans.. The fuel system still seems to puzzle me,,, i have tried to locate tbi fuel tank sending units and had no luck... so any good and quiet in-lines available?

80Sierra

You can use the tanks from an 88 - 91 Crewcab as well, they will bolt right up like the 87 regular cab tanks will, and have the fuel injection baffles etc in them.

You can bolt a 90-91 32 spline NP241 from a Suburban, Crewcab, or K5 Blazer / Jimmy up to a 4x4 4l60e or 4l80e. The NP241 drops on the proper side of the truck to run your driveshaft, and is equipped with the same VSS that the newer transfer cases use. You can use a speedometer cluster from a 90 - 91 Burb / 3+3 / K5 as they have electronic speedometers that are compatible with the signal that the PCM outputs. Make sure you re-pin your factory harness to be compatible with the newer cluster though

bowtieguy79

iTrader: (1)

I am doing this same swap on my 79 C-10. http://www.performancetrucks.net/for...d.php?t=406994

I used a sending unit from an 87. But as stated, any truck with the saddle style tanks 87 and up would work.

My bed is set up for dual tanks. I looked in to doing that with one external pump. S&P did this to a 77 http://www.hotrodlane.cc/77chevytruck/77chevy.htm

That helped me a lot, just seeing how some one else did things.
Also read through this thread http://www.performancetrucks.net/for...d.php?t=381116
He is doing similar to what you want to do with the transfer case.

If you have any questions on what I have done with my truck, just PM me.