MJ 350 swap

[Rusty Jeep]

I've got a 350 that makes around 300hp. so i'm thinking nv4500 will be the best rout to take.

[89 MJ]

My dad has an NV3550 (maybe 3500) in his 5.3 YJ on 35s. Its beat on and has held up.

[Rusty Jeep]

I don't think the nv3500 will work with a 350 from 1974 unless i'm wrong.

[derf]

1 hour ago, Rusty Jeep said:

I don't think the nv3500 will work with a 350 from 1974 unless i'm wrong.

Sure it will.  You can find factory parts to bolt them up easily.  The 4.3 V6 came with a 3500 and uses the same bellhousing.  Get a standard flywheel for the 350 (may be the same as the 4.3) and the right clutch parts and it all goes together easily.

[Rusty Jeep]

I'm still a little hesitant that the 3500 will be strong enough. 

 

[derf]

Then run a 4500.  Plenty of them in full size Chevy pickups starting in around 1993 or so.

[89 MJ]

Are you going to beat on your truck? My dads YJ with 35s, a 340 hp 5.3, and an NV3500 has done several burnouts and donuts on the pavement with no breakage. I think you’ll be fine. The 3500 came in half ton trucks too. 

[Rusty Jeep]

I want to be able stick the pedal to the floor with blowing the transmission. Is that transmission in your dads YJ stock internals or is it built.

[89 MJ]

27 minutes ago, Rusty Jeep said:

I want to be able stick the pedal to the floor with blowing the transmission. Is that transmission in your dads YJ stock internals or is it built.

Bone stock with God knows how many miles. 

[BeatCJ]

On 2/2/2021 at 7:32 PM, Rusty Jeep said:

will the nv4500 bolt right to a 350 without any issues? And my second question is will the nv4500 fit in a comanche?

I would think you would have to do some tunnel bodywork to get a NV4500 to fit.

[Pete M]

the 4500 is a giant heavy beast that has a granny first and is not much fun to shift. 

[Rusty Jeep]

Does anyone know if the gm power steering lines will screw right into the factory steering box?

 

 

[derf]

Unlikely.  You'll probably need custom lines.

[Rusty Jeep]

Is there any reason a 1999 explorer axle won't work in a comanche?

 

 

[Pete M]

it should work fine  

[88mjsally]

On 2/11/2021 at 4:05 PM, Rusty Jeep said:

Does anyone know if the gm power steering lines will screw right into the factory steering box?

 

 

Mine screwed right into the factory mj box. Not sure what the line came from but it also fit the s10 box on my dads Truck

[Rusty Jeep]

What gears would you get in the 8.8 with the nv3500?

[MiNi Beast]

saginaw boxes should be same, and 8.8 with 4.56s. 

[MiNi Beast]

Just now, MiNi Beast said:

saginaw boxes should be same, and 8.8 with 4.56s. 

or you mean came factory...  .8.8 i found with 3.73s to 4 10s, to 4.56s and can be had with lsd as well, but may need a fresh clutch disc pak installed. 

[BeatCJ]

On 2/25/2021 at 3:17 PM, Rusty Jeep said:

What gears would you get in the 8.8 with the nv3500?

With a 350, you could be pretty flexible. I would choose 3.73, but 4.10 wouldn't over rev it with an overdrive. Really depends on tire size, and I don't think I saw that anywhere.

[Rusty Jeep]

Does anyone make the sbc motor mounts for the comanche other than novak. Having a pretty tight budget I'm wondering if there is any cheaper options. 

[Pete M]

Advance Adapters probably does

 

[Rusty Jeep]

I have a 350 in front of an nv3500. I know there is two different size flywheels. I don't know what will work best.

[ghetdjc320]

This thread is further proof of what @Pete M and others have said before: there is no such thing as a cheap v8 swap. 

[MiNi Beast]

4 hours ago, ghetdjc320 said:

This thread is further proof of what @Pete M and others have said before: there is no such thing as a cheap v8 swap. 

Called a broke down Chevy.