90 GMC C3500 dually 6.0 4L80E swap in Frankentruck!

[kewljay223]

Were you able to put the delco 381 in the old pump hanger?
That sounds like my best option right now without going external.
If I can put the. 381 in place of the 90 pump I would just ad the sending unit to the old hanger?
Does that make sense?
I'm in Las Vegas by the way but for emissions I only need the tailpipe probe and a good gas cap. No obdii on a 90 so they won't have to check the computer when I smog it. Which is coming up soon. Forgot about that.

ok hold on. your truck is a 90 but your putting a 95 dash... im assuming this means DASHBOARD. but your putting an 05 gauge cluster in. is this correct? I think I'm following now... lol.

well in that case you won't need the old style sending unit at all since it sends the signal in a different manner. in 96, that's when obd2 started and gm changed to the newer style. so your EASIEST option would be to find a tank from a 96 to 98 truck. the duallies kept the body style until 2000 iirc. any of those should have the newer style sending unit and the tank should fit right in there. not sure if the duallies had bigger tanks tho.... and that would be it. fuel pump AND sender solved. but a tank isn't exactly cheap.

or you somehow remove the float wiper of the old unit and put the new wiper/float on. this would be the cheapest but would require some serious engineering! lol. and you would still need to swap the pump to the newer style also.

OR like I mentioned, do like I did and make a bracket for the new float and install it inside somewhere. you could use the wires from the old one since u don't need it. that way you don't have to add wires to the tank and try to seal it. that was a pain in the ass...

other than that, I can't think of any other way...

[JunkYardPirate]

Ha! Confusing right?
It's a 90 truck with a 95 complete dashboard an 05 cluster in 95 dashboard. And an 05 complete steering column. I also have the 05 dashboard wiring harness in the 95 dashboard.

Anyway. It does have the larger tank because it's a single tank dually. So it's 32 gallon I believe.
I'm going to look at the 931 and see if that can replace my stock pump. It had a 936 right now.
Might work!
- Jim

[JunkYardPirate]

I grabbed a 931 today. Looks like a perfect fit. I haven't put it in place yet but I'm pretty sure it will work just fine. I need to make a few fuel line adapters. I got the exhaust hooked up and had to break for a while. I will post pics later!

[JunkYardPirate]

I thought I snapped more pics, guess I didn't. here is a few test fitting and I am able to use the van exhaust! will work for now, I think I will keep the front cat on each side and delete the rear cats.. the way its sitting in there now I cut between the two cats on each section of pipe from the manifold back. so I can connect to my old exhaust from here back.. hangs a hair lower than I would like but I think it will work for now. might play with it later..

[kewljay223]

glad its working out. looks like you got a major leak of some sort though!! lol

[JunkYardPirate]

glad its working out. looks like you got a major leak of some sort though!! lol

I need to blast everything when I get it all bolted together. The stuff you see on the crossmember is from when I blasted it with cleaner before welding the motor mounts.
After all the fab work is done I will get under there and get the undercarriage cleaned up.
There shouldn't be any more leaks the LQ4 didn't have any. Going to replace some gaskets just to be safe.

[kewljay223]

yeah i figured it was just some residual stuff from before. was just messin with ya. my tbi leaked from every possible orifice that had fluid..... coolant, oil, trans, ps, ac.... lol it was just not worth fixing. it sure is nice to have no leaks now!!!!

[JunkYardPirate]

yeah i figured it was just some residual stuff from before. was just messin with ya. my tbi leaked from every possible orifice that had fluid..... coolant, oil, trans, ps, ac.... lol it was just not worth fixing. it sure is nice to have no leaks now!!!!

Haha! That's why my undercarriage is covered in gunk. That TBI leaked everywhere!!
Wish I would have had the time to really detail the frame and engine compartment while the engine n trans was out. Unfortunately time is a luxury on this build. Not sacrificing quality though. I think I've done pretty well so far on such a minimal budget.
I'm in the whole drivetrain / interior conversion $2800 and that's including the van purchase price 2 years ago when it was wrecked.
The nickle dime stuff is getting me now. I've got. 4k set aside for this. Hardly touched it yet!

Huge progress today. Will post pics n info soon!!

[JunkYardPirate]

Blah!!
didn't get it done today!! got a bunch of little stuff done, tightened everything up hooked up a few more components. sucks working on other peoples schedule!!:upyours: shop is only open till noon on Saturdays and closed Sunday's so I'm stuck till Monday.
went back to the Pick-a-Part yard today and found a 2000 to hijack some parts from, found a shifter cable in better shape than the one I had, also found the elusive transmission dip stick I have been needing and an oil cooler block off plate. I am going to run an oil cooler just not yet..
I think I am done part hunting so I should be able to wrap up the drivetrain swap within a few hours on Monday..
then hopefully I get my test drive!
plans after that is to get it home and finish the dash and door panel swap.

nothing really interesting to take pics of so heres a few general shots.....







off till Monday, comment away!!

[kewljay223]

lookin good. almost there!