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Old 11-22-2009, 12:43 AM   #1 (permalink)
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1994 Chevy Z71 cummins swap

Right now I know alot of my chevy guys are hatin on my because im actually LOWERING my 4x4 truck. BUT, im going to be building the strongest 4L80E possible and its going to be AWD like the late model chevy silverado ss trucks. Ive been debating on motors, supercharged late model LS motors but its all money.... I think going with a 2nd gen 6bt will be my best bet for PLENTY of power. Now onto my questions.

What would be more practical, 4bt intercooled and cranked up, or 6bt with injectors and fuel plate? haha I dont want TOO MUCH (this will all be in a half ton truck) just the fact that ill have a lowered AWD cummins chevy. I just cant decide on the motor setup because either way I plan on using the quad mounts from destroked along with their adapters if I go through with this. I know it costs more money but is it worth p-pumping a 24v for a daily driver or will a 12v suffice?
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Old 11-22-2009, 01:26 AM   #2 (permalink)
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well if u are looking into putting in a cummins in ur truck i would go with a 4bt just because the 1/2 ton frame wont hold up with a 12v or 24v in fact where i work at we are putting in a 4bt in a i think it is a 90 chevy 3500 and it seems to be that the 4bt is a more of a hassle than putting in a 12v lol
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Old 11-22-2009, 08:06 AM   #3 (permalink)
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Quote:
Originally Posted by Cumminsdiesel33 View Post
well if u are looking into putting in a cummins in ur truck i would go with a 4bt just because the 1/2 ton frame wont hold up with a 12v or 24v in fact where i work at we are putting in a 4bt in a i think it is a 90 chevy 3500 and it seems to be that the 4bt is a more of a hassle than putting in a 12v lol
go with a 4bt 12v is just to heavy for a 1500 front end. It can be done if you beef te front end up with all 2500 parts. but to me not worth the work, especailly with the power a 4bt can put out
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Old 11-22-2009, 08:44 AM   #4 (permalink)
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id put a 12v in it and let 'er twist. F it.
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Old 11-22-2009, 11:11 AM   #5 (permalink)
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Well seeing how I have torsion bars on the front end the only weak link would be the wheel bearing wearing out because the 1500-3500 4x4s use the same balljoints and tierod ends. And I can always swap torsion bars from a heavier load truck which was my plan. Ive seen quite a few guys go with the 4bt in the half tons because of its weight. But NOBODY tries to stuff a 12v in there unless its a one ton..... lol I wanna be different and I know a STOCK 12v would be crazy power in this light truck. Especially runnin 3.42 gears and a 30" tires haha
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Old 11-22-2009, 07:43 PM   #6 (permalink)
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if u are going to run the 3.42 gears u could run a 32-34inch tire to keep the rpms down is this truck a dully or single wheel got any pics of the pickup?
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Old 11-22-2009, 11:39 PM   #7 (permalink)
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i have a 95 z71 1500 4x4 and blow front end parts with a small plow a 12v will do a world of hurt on that front end. The front diff is not the same as a 3500 either. The awd silverado has different style front end that doesnt have a actuator. Dont quote me but i dont think a 3500 torsion bar will fit in the half ton a arms.
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Old 12-05-2009, 10:54 PM   #8 (permalink)
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Ive had many considerations on swapping a 4bt or a 6bt but the only way ill get the power I want is with the 12v. I might even have a good lead on a CHEAP 24v I can swap a p-pump and get stupid with it. The truck is in a big makeover right now Here is how it sits with ~32" tires.


And just so everybody knows the 1500-3500 4x4s the only difference suspension wise are the torsion bar weight ratings and the wheel bearings. They use the same size ball joints and tie rods. The only weak point I would see is the wheel bearings maybe wearing out faster from the added weight but I planned on swapping some heavier torsion bars. All GM torsion bars are the same for fullsize vehicles 88-up. I understand power wise its a huge difference but GM also offered the 6.5 turbocrap in the 1500s same body style so I think a few hundred more pounds fully dressed wont be bad. Also im not worried about frame strength or anything because this truck will strictly be a daily driver toy, no towing, dragging, or pulling. I just havent found enough info on a 4bt to make me happy. I wanna be around 800ft/lbs+++ which is easy for a 6bt....
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Old 12-05-2009, 11:02 PM   #9 (permalink)
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800ft-lbs isn't going to be easy on a 10bolt rear. Or even a 14bolt 6 lug SF axle...
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Old 12-05-2009, 11:13 PM   #10 (permalink)
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Got something else for you to think about. You'll need to drop the engine way down in the bay to clear it under the hood. Or you'll need to raise the body.
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Old 12-05-2009, 11:39 PM   #11 (permalink)
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And actually for street driving and small light weight street tires and wheels the 9.5" will hold up to plenty which is what I have. There have been quite a few swaps in these trucks where it clears the firewall just fine with no body lift or anything. I just dont think the 4bt will suit my power needs and still get decent mileage especially in a 5000lb truck. That is why I was considering just doing the 6bt swap since ive been reading ALOT on 4btswaps.com Making the motor fit is my biggest issue fully dressed with accessories and AC. Just havent seen enough of these swaps to make me happy yet.....
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Old 12-06-2009, 12:04 AM   #12 (permalink)
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Ask around about the crossmember. I'm working on a 95 2wd that I'm swapping a straight axle under. I'm just going to install a body lift to gain hood clearance. There's a guy on compd that has done a swap like yours.
"Cummin on Strong" 98 Chevy Cummins - Competition Diesel.Com - Bringing The BEST Together

Here's one more like mine.
5.9 in a 95 chevy - Competition Diesel.Com - Bringing The BEST Together

More talk about body lifts.
Installing a 5.9 cummins 12 V in 1992 Chevy 2500 - Competition Diesel.Com - Bringing The BEST Together
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