chevy NV4500

[Wyomingcowboy]

I just bought a 93 Chevy 1/2 ton and was wondering if these trannies have the same 5th gear nut problems as the one on Dodges?

 

[snappy]

No 5th gear problem with the Chev/NV4500. Only the Cummins will loosen 5th gear.

 

[surfbeetle]

It has something to do with the vibrations and torque from the Cummins Diesel. If you don't lug the engine and use 5th gear below 2000 rpms, you should be okay, I have 194,000 miles on my factory original 5th gear nut and trans.

 

[WOTURBO]

I had a chevy diesel and i know some friends that had one. Both trucks had the nuts back off.

 

[rscurtis]

I'm not a Chevy expert, but would the 4500 be used in a light duty gas truck? Perhaps it's a 3500, which Dodge used in their half-tons.

 

[Wyomingcowboy]

I was mistaken, it is not the 4500. No worries on the 5th gear nut!

 

[Wyomingcowboy]

Long story on this truck and the POS that sold it to me - anyway, I have finally taken possession of it and am in the process of replacing the clutch. In looking at the still mounted, and very dirty transmission I can see an NP cast in the housing on the passenger side. What kind of trans is this? SomeData lists the possibility of 4:

• NV 3500 Transmission

• NV 4500 Transmission

• 5 Speed, Hydramatic (MG5/MY2/M50)

• 5 Speed, New Process (MW3)



They only have specs for the NV trannies. I found a post on wiki that talked about the MW3 being a predecessor to the NV3500 and according to a table on that site, the 2 weren't used in the same years.



Any thoughts? I'll have it out monday and can look for other #'s then.

 

[ata]

NP is New Process which was bought out by NV, New Venture around 1993. So the tran's that is in your 1500 Chev should be a New Process.

 

[Wyomingcowboy]

According to Blumenthal's it is the NV 3500. Now I need an input shaft bearing retainer. They have new ones for $57. Anybody know where I might find a used one? I know the transmission would have to be scrapped in oreder to sell just that one thing, but you never know.

 

[eliza18812]

that's great

 

[Wyomingcowboy]

OK - NOW Blumenthal's says it is an NV 4500! I found another site here NV4500 Case Assembley Parts Diagram and Parts Listing and it says that this is correct. The input reatiner cast numbers on mine and the part # Eddy at Blumenthal's gave me match. They were out so he suggested 6-States Distributors out of SLC. We also have a 6 States here in Rock Springs so I called and they'll have it here tomorrow!

Anyway - I am back onto the 5th gear nut now. Should I worry about this at all with my stock 350 gasser?



FWIW - I have dealt with 6 States in Rock Springs before and they too have excellent service. I even had one of their techs show me all his tricks and tips for U-Joint installation. They are fast, friendly, and affordable. 3 great qualities for a company to have!

 

[Flinty]

Be glad it's not a borg-warner. I had one in my chevy and wore it out lickity-split. At least you have workable material. All the nv's I've seen in chevys have been 4500s.



Jon

 

[Wyomingcowboy]

I finally got the clutch and associated parts to put this sucka back together and don't know which way this pilot bearing goes in... .....

 

[Wyomingcowboy]

Well I couldn't wait any longer so for better or for worse I put picture 1 facing outward and picture 2 towards the motor. I now need to wait until morning and buy a new release fork pivot pin. Should I apply some grease to the transmission input shaft the way I did with the 5600? I didn't put alot but i did put some wheel bearing grease on it to help it slide on a littel easier. Some Data (all data) is helping me VERY little as far as this is concerned.

 

[Wyomingcowboy]

Anybody?????

 

[NIsaacs]

I would think the pilot bearing would install with the taper toward the input shaft for ease of install, but that is a guess. I don't use grease on the splines, that will just collect clutch dust and gum it up.



Nick