ffryno13

i am kinda torn between swaping a 3.4 toy or a 4.3l chev. its pretty much come down to which one give the best power and MPG. i think the 4.3 would be alot of fun and there are a ton of parts. i think that the 3.4 would be pretty cool to stay toyota but they dont have the same aftermarket and parts at every store.

i want to supercharge what ever engine i get, is that going to hurt MPG?

i am going to be running 39 iroks, dual cases, and longfields or Dana 60s. i am already SASed and i am going to run ARBs

Dirt Master80

if your going to supercharge any motor forget about mpg its going down. the 4.3 chev and 3.4 toy are very close motors for hp/tq and mpg. the toyota may be a bit more reliable but its also more expensive and harder to find parts for. i think the cost of the swaps is comparable. so you decide chev or yota. i went chev so i could use a 700r4 trans

ffryno13

what transfer cases are you using the 700r4 is a 5 speed? i am good with toyota stuff not so much at chev

thewjsand

I had a Supercharged 3.4 5 speed and at one time i got 23 mpg on the highway. I typically average 18 or 19 for 60/40 driving. I doubt you would get the 18 with the vortec engine stock let alone super charged.
my 0.02$

86toylet

Go 4.3, most of theses guys around here are purists. They would rather spend an extra amount of money and hassle to stick a 3.4 in, and then buy really exspensive parts. I enjoy power and cheap parts, thats one of the benifits of a 4.3. This debate has been going on since long before YotaTech was around. Don't get me wrong I love a good Toyota, but I also love the Chevy stuff. You wont get 18-20 mpg out of either motor, especially when running large tires.

vermontoyota

two of my good friends have identical trucks: late model 1500 4x4 short beds with 4.3's and a 5spd. They both get crappy gas mileage, no better than a V8, 18 hwy 15 city

JasonWin

My good buddy has a 2WD sierra 1500 and he gets horrible gas mileage. As mentioned above, it's no better than a V8. I can't say what the 3.4 would get but I would assume it'd be at least a bit better.

crolison

your swapped and want to run 39's.....

Is gas mileage even a question at this point?

Dirt Master80

the 700r4 is a 3 speed auto with lockup converter(it has overdrive) it will bolt up to any chev v8 or the 4.3. it was the replacement for the bulletproof turbo350 trans. it also has a lower first gear than the turbo350. advance adaptors sell the kit to hook either one of those trannys to a toyota case

racingcameron66

i like the 700r4 idea its a great trans. so yea my.02

mattaway

My 89 s10 had a 4.3 in it. I loved that truck. I beat the piss out of that motor all the time, with very few problems. She finally died right before the odo read 200,000.

and to answer the mileage question, mine got around 15 to 17 depending on how i drove, that's having close to 200K, and being ragged out.

i recommend the 4.3 over the 3.4

1. it's a chevy
2. very reliable
3. cheap and easy to build/work on
4. solid motor
and 5. it's a chevy!

EDIT:

you've got to consider the weight differences between a full sized chevy and 94 toyota when comparing gas mileage like that....

yoterr

any motor supercharged is gonna get better MPG's on the highway, but being a rig with dual cases and 39"s dont think its gonna be on the highway much...right??

Dan.3

I did the 3.4 swap and just used my 340h. I chose the 3.4 because it was a bolt in upgrade since I had the 3.0. If I had the 22r and had to modify I might have looked into the 4.3 or a really mild 350 because you can find both those motor really cheap.

crolison

Parts 1 and 5 make your argument invalid.......... sorry

I'd personally swap in the 3rz

Dan.3

Wow in this case Im glad I went with the 3.4 Good advice not to go with the chevy. Thanks for the info.

I know a guy with over 300k on a 22re and will run it a full throttle for 5 minutes at a time crawling through deep ravenes. Overheats it, lets it cool, and then back at full throttle again. Of course he is running 42s with a dual case and 4.10s

Listen to mattaway and go with the 3.4 swap

firemaniac

If I had to make the choice right now, it would be the 4.3 Chev, and either a 700r4 or 4l60e. reason being is I have had the 4.3 with the 4l60e in a 99 Astro van (the short bus) with AWD, drove like a bat outta h e double hockey sticks, and still averaged 16MPG, it has good power, and even though it was wedged in a van it was fairly easy to work on. Also as a cousin to the SBC there were some easy upgrades available for it (chips, intake, ...). One more thing it has going for it is being as it was/is used in so many different platforms and models, pretty much every place that calls themselves a parts supplier has parts for theme

vital22re

iTrader: (2)

are you replacing a 3.0? if so i say go with the 3.4. i did and i love it. Its a straight bolt in. plenty of info on it in the swap section. I get better mileage, more power, and i'm not worried about the motor blowing up. just Gear it right and you shouldnt' have any problems with power.

jusfloorit

O.K. I have driven both.

Both motors were stock. The 4.3 was turning 32x11.5 and the 3.4 was turning 33x12.5. But the 4.3 had 3.73's and the 3.4 had 4.11's so I guess call that a draw. Only real difference was the 4.3 was backed with an auto. Both motors were 2000's

Fuel mileage is a tad better in the 3.4

The 4.3 has better low end torque then the 3.4.

The 4.3 is cheaper all around (parts/aftermarket). Swap cost, I don't know.

Strength wise they're also the same. 4.3's can take a beating. I sold my 89 s-10 with 245,000 miles that was a Virginia Beach Patrol truck for 150,000 miles of it's life and it ran mint. I also drove it to Daytona Beach and back from Jersey (2,800 miles round trip) with no problems. On the ride back she turned 210,000 miles old.

We all know the 3.4 definately can hold it's own in that department also.

Keep in mind, the 4.3 was in the infamous mid 13 sec., AWD, turbocharged Cyclone/Typhoon trucks, so making power AND strength IS no problem.

As you can see, i've been a Chevy guy all my life. I've had my 22r Yota for 4 years now and except for a HUGE deficit in the power department, I love it.

If my truck started out a v-6, i'd put in the 3.4. If I were to swap out the 22r, i'm putting in the 4.3. Just my .02.

P.S. The 700r4 is an awesome trans but so you know, it is a 4 speed trans. with converter lockup in 3rd and 4th gear. Lockup doesn't give you an extra gear. It just gives you direct drive through the drivetrain with the gear you're in with no convertor slip. It helps with fuel economy and trans. temps.

If that weren't so, then my Camaro wouldn't have a fourth gear with the 2,800 stall non-lockup converter. And burying the 145mph speedo would be impossible with 3.73's unless i could turn nine grand.

Hope this helps. Good luck.

Dirt Master80

i would agree with most everything said already. if your swaping out a 3.0 the 3.4 is the logical choice its pretty much a bolt in. if your stating with a 22 carb or efi and thinking of an auto i think the 4.3 takes the cake

super charger gets better mileage on the freeway? you must not understand how a supercharger works. the whole point of a super is to compress air(creating whats know as boost) and ram it in to the cylinders,but air alone dosent make power. with the added air in the cylinder the motor can dump alot more fuel into the cylnder to keep the fuel air mixture correct. so you always have more air and fuel being dumped into the cylnders creating a more powerfull explosion and reducing gas mileage. superchargers will always decress mpg in princible. it is posible to get better mpg with the fact that you may not need to push the skinny pedal as much as pre-charger so the mpg might stay the same.

ffryno13

i thought i said i was starting with a 22re but my bad. it ll be driven daily to the trails and i mean every day!!! i am going to run 39s or 38s. i am most likely going to swap for a ext cab. i should just get another truck and start over but i love my truck to death and its going to stay with me forever. my goal for this truck is to turn it into the ultimate wheeler daily driver. i don t really drive that far anyway. i am getting 16.5 right now with 5.29s 22re and 5speed on 37s.

anybody know what chevy 5speed i can run behind a 4.3 that could handle a supercharger?