4.3 vaccum/ positioning questions...

MIKEMOKAS · 01-26-2009, 06:35 PM

hey guys, lately ive been throwing around the idea of a 4.3 swap in my 91 ext cab 3.0 5speed truck. the headgaskets are going and the damn valve covers leake like no other... i would go with a throttle body 4.3 vortec and my w56 tranny/ tcase...

my first concern was what would happen with all of my stuff that is vaccum actuated? ie, front diff..?

another concern is how everything would fit together?? like if i got the AA w56 to 4.3 bellhousing, and i got the AA 3.0 to 4.3 engine mounts would everything just bolt up? would all of my tranny/ tcase mounts be left alone?

thanks for any info/ advise!!

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RevNL · 01-27-2009, 10:16 AM

Quote:

Originally Posted by MIKEMOKAS

my first concern was what would happen with all of my stuff that is vaccum actuated? ie, front diff..?

There will be vacuum ports on the 4.3 to plug into. You'll have to use your imagination to get it hooked up.

Quote:

Originally Posted by MIKEMOKAS

another concern is how everything would fit together?? like if i got the AA w56 to 4.3 bellhousing, and i got the AA 3.0 to 4.3 engine mounts would everything just bolt up? would all of my tranny/ tcase mounts be left alone?

From what I've read, the Advance Adapters bellhousings and mounts are designed to work with the transmission in the original location.

texcat101 · 01-27-2009, 04:53 PM

The vacuum is not a problem there are plenty of ports and a $2 fitting assortment pkg will get you what you need.
I am swapping a 4.3/ 700r4 into my '85 4runner and it really needed the recommended 2" body lift.
I think the 4.3 swap may work better on a straight axle rig than on an IFS rig from what I have read, but you may be able to use the smaller oil pan to eliminate those clearance problems.
My thread in this section has some info that may prove helpful, but pirate4x4 has many 4.3 swap threads if not. Most of what I am doing is not necessary or advised.

01-27-2009, 04:53 PM	#3 (permalink)
texcat101 Registered User Join Date: Mar 2008 Location: W. Texas Posts: 367	The vacuum is not a problem there are plenty of ports and a $2 fitting assortment pkg will get you what you need. I am swapping a 4.3/ 700r4 into my '85 4runner and it really needed the recommended 2" body lift. I think the 4.3 swap may work better on a straight axle rig than on an IFS rig from what I have read, but you may be able to use the smaller oil pan to eliminate those clearance problems. My thread in this section has some info that may prove helpful, but pirate4x4 has many 4.3 swap threads if not. Most of what I am doing is not necessary or advised. __________________ 85 4runner, 3" spring lift, 4Crawler 2" body lift, Precision Gear 5.29's w/power brute posi frt & rear, M/T Baja MTZ 33x12.5x15, Warn M8000 winch, Optima redtop, Marlin Crawler Front, Rear Bumpers and Sliders, Allpro crossover steering & U bolt flip, LC rotors, '94 calipers and booster. 4.3 vortec / 700r4, Megasquirt II, EDIS6

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