I just bought a NV4500 to swap out my getrag in my 1992. I really like Royal Purple products! I can get really great discounts on Royal Purple products at work! I went to Royal Purples website and it says on there that for a NV4500 to use thier 75-90 Maxgear oil. But for a NV3500 and NV5600 it says to use thier Syncromax manual trans fluid! What is the best to use in a NV4500 and exactly how many qrts does a NV4500 take? Thanks for all your help guys!

 

run the RP with the gl-4 in it thats what they take and overfill it by one. have had about 10 of those trannies and thats what worked out the best. should hold 5 normal so put in 6. The syncromax is a gl-5 i think and if it is it will eat the brass parts up in it

 

It shows the Maxgear 75-90 to be the GL-4. So I should use that?

 

yea thats what i ran. if you tow a lot change it about every 6 months or 50k to keep it in good shape. also make sure the 5th gear nut fix has been done before you install it

 

I was told that that is the only thing that has been done to this trans! If I take the top cover off can I visually tell if it has? And back to the fluid, I should use 5 qrts or 6qrts? Thanks, Robert

 

no you can only tell by taking the tail housing off behind the transfer case. run 6 fill it from the top. easiest way to do it

 

Castrol Syntorque is the only oil to use in a NV-4500

 

Is that the closest to factory? And how many qrts?

 

I put over 200k running royal purple in my 4500.

 

i have a gal of Castrol Syntorque, is it okay to top off with some lucas treatment?

 

Are you running the maxgear 75-90? Or the syncromax? And again how many qtrs?

 

I put royal purple in mine and am now having problems with it. Either the fluid cause it or it is just a coincidence that it starter acting up when I changed fluid.

 

maxgear and was running 6 quarts havent had a 4500 since last year in my 03. before that 01 , 98.5, 97. now have the g56 in the 07 and 06

 

Some info for the 4500HD
http://dodgeram.org/tech/transmission/nv4500_spec.htm

 

NV4500HD Specs:

* Manufactured by New Venture Gear
* Synchronizers: Carbon fiber composite
* Input shaft: 1-1/4" 10 spline (Diesel, V10 version - order code DDX)
* 4x4 Output shaft: 1-1/2" 29 spline
* Input torque rating: 460 ft-lb
* Max GVWR: 16,000 lb
* Max GCVWR: 21,000 lb
* Cast Iron Case, Weight (with oil): 250 pounds
* Fluid Capacity: 8.5 pints

o Fill level is to the bottom edge of the fill plug hole.
o These are the ONLY lubricants recommended for the NV4500:
+ 75W-90 Castrol Syntorque Synthetic
+ Mopar Manual Transmission Lubricant (PN 4637579)
+ GM Transmission oil (PN 12346191)
+ NOTE: Syntorque is NOT the same as Castrol Syntech.
+ Standard Transmission has the oil. 1-800-783-8726
+ Alternative oils?
* Drain Plug P/N: 4882280


Notice that the synchros are Carbon Fiber - use the Castrol Syntorque as recommended (and NOT Castrol Syntech)