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Old January 18th, 2010, 12:25 PM   #1
garemo
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Default 4.3 in yj

I was just given a 98 gmc jimmy and i am going to put the 4.3 into my yj the jimmy is 2wd and has an automatic i was wondering what manual transmissions will bolt up to it. i was thinking the ax-15 with a gm bellhousing i want to keep it cheap and simple. any help is appreciated thanks
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Old January 18th, 2010, 12:41 PM   #2
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Look for a T-5 out of a S-10 along with the t-case to it. Alot cheaper than buying an adapter from AA or Novak. IMHO. I was going to do the same thing with my CJ but changed my mined a long time ago.
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Old January 18th, 2010, 12:54 PM   #3
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oh ok thanks for the info i appreciate it
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Old January 18th, 2010, 05:24 PM   #4
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NV3500 from 91 and up S-10 or blazer. a T5 from an s-10 was behind only the 2.8's. the NV3500 will be a direct bolt up for the 4.3 and the drivers drop 231 will work perfect with the stock jeep axle
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Old January 20th, 2010, 08:03 PM   #5
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We swapped the 4.3 out of my old 93 Jimmy rock rig into my buddies Daily driver 87 YJ last winter. Super easy swap. We used a 91 S-10 NV3500 and the front half of the chevy t-case with the back half of the jeep 231 t-case. This allowed him to use his cable speedometer.

We used advance adapters motor mounts and they were great. Much stronger than stock.

By carefully setting the motor so there was approximately 1/2 inch of clearance between the firewall and back of the block we were able to use the stock driveshafts. Plus the harmonic balancer sits approx 2 inches behind the front axle center line, technically making this a mid engine jeep.

The 4.3 is almost 300 pounds lighter than the jeep six, and the front now rides like a tank. He plans to either take out a leaf or swap in longer softer springs.

The stock Jimmy fuel pump fit into the YJ tank with a simple home made adapter plate and works with the factory gauge.

Factory S-15 manifolds fit the frame perfectly.

S-10 power steering hoses bolt up to the YJ box.

The radiator hoses are on the wrong side, he just made steel crossover tubes.

The shifter hole had to be moved back about 2 inches in the floor.

The jeep master cylinder works fine with the chevy slave.

All of the factory gauges worked with the chevy motor. My jimmy was already running a howell harness with the CPI so we used that as well.

You will need to have the computer reset to eliminate the auto trans function. On my 93 motor I had to do this when I swapped to a stick.

The 4.3 flywheel is specific to the 4.3 and you will need to get one of those.

You can also use an S-10 T5 trans. You will need to use a full size truck hydraulic bellhousing, then cut 3/8 inch off the pilot shaft and about 1 1/2 off the throwout shaft. You can use a fullsize clutch plate and 4.3 flywheel but will need a 13 spline astrovan clutch disc.

PM jsteinmetz on here. He is the guy we swapped the motor for, and he probably can share more tech and pics.
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Old January 20th, 2010, 08:34 PM   #6
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Quote:
Originally Posted by keithshotrodshop View Post

The 4.3 is almost 300 pounds lighter than the jeep six, and the front now rides like a tank. He plans to either take out a leaf or swap in longer softer springs.
Are you sure about that?
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Old January 20th, 2010, 08:38 PM   #7
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Are you sure about that?
Yep, I ran across the exact weights a few years ago. If I remember right the 4.3 was about 330 lbs, where the 258/4.0 was about 600 lbs.

We could see a huge weight difference when using the cherry picker and loading the engines into the trucks.

With the motor swap done, the front sits a full 2 inches higher than it did with the straight six.
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Old January 20th, 2010, 09:35 PM   #8
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I'm seeing a difference of about 75 lbs, You can stretch that to about 100lbs but not 300.
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Old January 21st, 2010, 08:34 AM   #9
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I'm seeing a difference of about 75 lbs, You can stretch that to about 100lbs but not 300.
Wherever you are seeing it, you are seeing it through beer goggles or it is just dead wrong. I've picked up both motors on several occasions and the straight six is twice as heavy.

One of the things I've noticed is that a lot of the jeep guys are in denial as to how much of a boat anchor the six is. They like to post the short block weight, or the weight of the motor without manifolds and accessories.

Check with a wrecking yard that ships alot of motors, they'll let you know.

Straight six engines are almost always heavier than even V8 engines. For example, I do alot of 55-57 chevy stuff. If you swap from a straight six to a big block V8 the nose goes up and the car rides stiffer.
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Old January 21st, 2010, 11:12 AM   #10
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Wherever you are seeing it, you are seeing it through beer goggles or it is just dead wrong. I've picked up both motors on several occasions and the straight six is twice as heavy.
I have perma-beer googles

Look around, 425-475 for a un/dressed 4.3L and 500-515 for a dressed 4.0L. I've never seen one mention of a 4.3L down in the 3XXlb range. I'll agree that a 4.3L is lighter than a 4.0L but not by much.

weight info for parts axles,trannys,motors,tires,transfer cases etc..how much do they - Pirate4x4.Com Bulletin Board

Engine weight - Pirate4x4.Com Bulletin Board

Engine Wieghts - Pirate4x4.Com Bulletin Board

And some misc. weights thread:
weight list, engine, axles t caes ect - Pirate4x4.Com Bulletin Board

My LS3 is around 450 lbs with accessories and it has an aluminum block and heads and has a plastic intake manifold.

If you do the 4.3L swap in a jeep, make sure you do the 4L60e trans too, the pair work well together.
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Old January 21st, 2010, 06:05 PM   #11
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If you do the 4.3L swap in a jeep, make sure you do the 4L60e trans too, the pair work well together.
I eventually want to get a big game scale to use on my cherry picker so I can get exact weights of motors and axles. Might be fun

The 4L60e is a great trans for women who don't know how to drive a stick
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