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NV4500 5 speed 3rd gear synchro going out? 1994 K3500

Old April 23rd, 2011, 10:15 AM
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Default NV4500 5 speed 3rd gear synchro going out? 1994 K3500

NV4500 5 speed 3rd gear synchro going out? 1994 K3500 6.5 diesel

It seems the 3rd gear synchro is going out in the 1994 K3500. That is a NV4500, correct?

I've never torn into a transmission or differential before.

The trans is grinding going into 3rd gear. If you don't rev up to normal speeds in 2nd and shift excrutiatingly slowly the grinding can be avoided.

Can anybody give me advice or parts numbers for what will be needed?

How big a job is this? Is this best left to a guy that knows trannys well?

Would I be money ahead to look for a good used NV4500 for a diesel?

I thought I read somewhere that these transmissions are diesel specific? Different spline count or something. Can anybody verify.

Any advice would be appreciated.

If there is a better place to post this or a link to a how to, I would much appreciate a heads up.

Old July 27th, 2022, 1:19 PM
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Default Nv4500 3rd and 5th needs rebuilt.

Originally Posted by jrsavoie
NV4500 5 speed 3rd gear synchro going out? 1994 K3500 6.5 diesel

It seems the 3rd gear synchro is going out in the 1994 K3500. That is a NV4500, correct?

I've never torn into a transmission or differential before.

The trans is grinding going into 3rd gear. If you don't rev up to normal speeds in 2nd and shift excrutiatingly slowly the grinding can be avoided.

Can anybody give me advice or parts numbers for what will be needed?

How big a job is this? Is this best left to a guy that knows trannys well?

Would I be money ahead to look for a good used NV4500 for a diesel?

I thought I read somewhere that these transmissions are diesel specific? Different spline count or something. Can anybody verify.

Any advice would be appreciated.

If there is a better place to post this or a link to a how to, I would much appreciate a heads up.
hey I just joined I never used a forum before but I felt like I felt like I had some questions to ask ,my 96 has a 97 nv4500 5 speed in it and 3rd was scratching in it when I was driving it then I swapped the tranny over into my auto matic tmaticdidnt last but over a year and 3rds out again also 5th but 5th doesn't sound like a synchro problem when I drive it I think what its doing when I put it in 5th it acts like it's in neutral, so did something come loose off the shaft or break? 3rd is definitely the synchro and also 4th is a really hard shift in and out , what options of rebuild kits do you recommend I found some for everything for around 309 at cobra transmission parts is there any cheaper routes I would love to get it back on the road eventually.
thanks
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