Nv3500-nv4500 swap

[Blackwater]

This is good info about the flywheel and clutch. My truck originally had an SM465, so when I did the engine swap I put a new flywheel and clutch in with it. I kept the same flywheel and clutch when I swapped in the ‘92 NV4500 MT8 (external slave cylinder and 6.3:1 1st gear). Fast forward a year, the clutch was shot so I had it, throwout bearing, and shift fork replaced. I also swapped the original SM465 master / slave cylinders for the NV4500 ones. Now the clutch is chattering when starting from a stop so I’m thinking this clutch is almost gone. I must have the wrong flywheel for this setup now.


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What year is your truck?

 

[Chewy1576]

1990 K2500. I bought a ‘92 K2500 to use as a donor. Both 350 TBI engines.


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[Blackwater]

6 or 8 lug? on the wheels?

 

[Chewy1576]

Both 8 lug, 8600# gvwr. I should have gotten a picture of them side by side. Both RCLB, same light blue, except the other truck had a lot more paint left on the body panels haha.


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[Blackwater]

No need for a picture. the NV4500 MT8 came out in late 1992 and the NV3500 came in early 1993. Are you wanting to Mount the NV4500 on the 90 modal?

 

[Chewy1576]

It’s already there. Been there for about a year and a half. Went through a rebuild this summer. I think I have a flywheel and clutch mismatch though, because it’s eating clutches in just over a year.

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[Blackwater]

It’s already there. Been there for about a year and a half. Went through a rebuild this summer. I think I have a flywheel and clutch mismatch though, because it’s eating clutches in just over a year.

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Are you using the 1990 clutch and flywheel? If not, use a 1993 2500HD clutch flywheel and see how that feels. Also make sure you are replacing the brass bushing in the engine block where the input shaft goes in. there is a special pull you can borrow from Oreillys and autozone.

 

[Chewy1576]

The flywheel was new and specced to work with an SM465 when I did an engine swap about 4 years ago. The pilot bushing was replaced with the throwout bearing and shift fork about 2 years ago. It will only be driven occasionally through the winter, so maybe I’ll find a shop that can get it all straightened out next spring.


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[Blackwater]

What I have learned is the NV3500 MG5 and NV4500 RT8 share the same clutch and flywheel when mated to a 5.7. It changed in 1998 when the transmissions went to internal slave cylinder. Also, the clutches where not shared between the NV3500 MG5 (M50 for s10) and the NV4500 MW3.

 

[Blackwater]

The flywheel was new and specced to work with an SM465 when I did an engine swap about 4 years ago. The pilot bushing was replaced with the throwout bearing and shift fork about 2 years ago. It will only be driven occasionally through the winter, so maybe I’ll find a shop that can get it all straightened out next spring.


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The engines never changed from 87 (square body) to 1998. I suggest throwing a 1993/1994 clutch and flywheel and that will solve your problem. When I drop my LQ4 402 stroker down in there I have to use the 2004 clutch and flywheel since the blocks are a little different but both use the same bell housing. the SM465 is a great tranny but lacks the top gear. I would have used a gearvendors on it. You just cant use the gearvendors while in 4 x 4.

The link in my signature is to the truck I did the swap.