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Username Post: What’s Nv4500 correct fluid now        (Topic#358881)
2000 4x4 GMC 
Posts: 75
2000 4x4 GMC
Loc: MS
Reg: 03-03-15
11-20-19 12:34 AM - Post#2780572    

The old correct manual trans fluid for a NV4500 5 speed was gm 12346190.SAE 75-85 GL4. It’s been discontinued, like a lot of parts. What would be the correct fluid to use now so not to damage the carbon fiber parts? I’ve seen many different posts about the right one to use now and all had different numbers and weights. I do put a Heavy load on the truck from time to time.

Senior Moderator
Posts: 29134
Age: 50
Loc: Texas
Reg: 08-01-03
11-26-19 03:47 PM - Post#2781018    
    In response to 2000 4x4 GMC

Are you sure it's discontinued? You can buy it on Amazon, Summit, multiple GM online dealers...

If a dealer is telling you it's discontinued and can show proof, I believe you. I haven't needed to buy any in several years so I have not personally tried. However, a quick search shows it is out there for purchase.

I would not use anything else in an NV4500. Either GM 12346190 ("Synthetic Manual Transmission Fluid") or Mopar 4874459 ("Synthetic Manual Transmission Lubricant") both are the Castrol Syntorq LT product which as far as I know cannot be bought in the Castrol label, only as GM or Mopar OEM products.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

2000 4x4 GMC 
Posts: 75
2000 4x4 GMC
Loc: MS
Reg: 03-03-15
11-26-19 09:11 PM - Post#2781032    
    In response to someotherguy

Best I can come up with Richard is a new number from GM. The long number is 19369226. Short # 10-4119. Synthetic manual trans fluid 75w-85 GL4.
I see some,summit, that state the GM # 12346190, but the weight is wrong. Says 75w-90 GL4 with the short GM # 10-4059.
My book says use the 75-85w. Which do I use? REALLY don’t want to burn up my New NV4500 tranny. Cost a whole lot to get it rebuilt.

Posts: 1243

Loc: Mission,BC
Reg: 02-03-05
11-26-19 10:05 PM - Post#2781034    
    In response to 2000 4x4 GMC

The 9226 fluid replaces the 6190 fluid,gm did this a few years back
The Canadian pn is 10953477
Amsoil makes a compatible oil mean for the carbon fiber syncros to
And going from 75w85 to 75w90 is fine

69 Canadian Pontiac 2+2 Convertible
Factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35'S
07 Town Car Loaded,Tinted,Getting Bagged

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