QU90020 MT85 75w85w NV4500 Manual Transmission Oil is a 75w85w Full Synthetic, GL-4 Manual Transmission Gear Lubricant formulated by Redline that replaces the now out of production, Castrol Syntorq LT® oil in New Venture NV4500, NV4500LD, and NV4500HD manual transmissions. QU90020 is a full synthetic, API Service GL-4 manual transmission lubricant specifically formulated for smooth shifting and outstanding protection under a wide range of operating extremes including low and high temperature conditions. Use for GM 12346190, Chrysler/Dodge MS-9070, 4637579 & 4874459 specifications. 1 Quart Bottle.
1992-2007 Chevy and GMC all with New Venture NV4500 5 Speed Manual Transmissions
1992-1993 Dodge D150, W150, D250, W250, D350, W350 with Gas Engine and NV4500D 5 Speed
1994-2004 Ram 2500, Ram 3500 with Diesel or V10 and NV4500HD 5 Speed
1994-2005 Ram 2500, Ram 3500 with Gas V8 and NV4500 5 Speed
Also for any other manual transmission application calling for Castrol Syntorq LT fluid
Legacy Catalog Page
Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!
Tech Note 1: Castrol Syntorq®
Castrol Syntorq LT® was a low-temperature rated, 75w85w GL4 synthetic oil formulated specifically for the New Venture NV4500 5 speed manual transmission used in Dodge and GM light trucks. Syntorq LT® was also used by many import car manufacturers with various other manual transmissions. It was not an extreme pressure rated lubricant so it is not suitable for use in the hypoid gear axles found in almost all light trucks. Castrol discontinued Syntorq LT® a few years after NV4500 production ended in 2006. Our Redline QU90020 75w85w GL4 Manual Transmission Oil specifically meets the GM 12346190, Chrysler/Dodge MS-9070, 4637579 and 4874459 specifications. In operation, QU90020 equals or exceeds the performance of the original Castrol LT® oil for New Venture NV4500 5 speed manual transmissions.
Tech Note 2: Synchronizers
New Venture NV4500 5 speed transmissions use synchronizer friction rings that are lined on the inside with carbon fiber facing material. The carbon fiber lined NV4500 synchro rings used as original equipment and by most rebuilders are only compatible with lubricants that SPECIFICALLY meet one or more of the following standards: GM 12346190, Chrysler/Dodge MS-9070, 4637579 and 4874459. The list of incompatible lubricants includes ALL GL5 or GL6 rated conventional and synthetic gear lubricants, plus most GL4 gear oils. To get around the specific lubricant requirement, there was a couple of Asian companies making bronze synchro rings. I do not know if anyone still sells those hard-shifting bronze rings, but those things shortened the service life of most transmissions they were used in.
Tech Note 3: Lubricants, Sealants, Threadlockers:
Early production NV4500 Transmissions used an anaerobic sealant (QU90003) to seal between the main case and input bearing retainer, top cover, and rear housing. Mid-production units used anaerobic sealant just on the input retainer and RTV for everything else. Later production transmissions used black RTV Sealant (QU90006 or QU90005) for everything. Either type of sealant works fine (except the PTO covers ALWAYS should be sealed with RTV), but I prefer RTV for all components. Regardless of which sealant you use, make sure excess sealant does not block the lube access hole at the top of input retainer pilot that fits into the transmission case. Also, the threaded holes in the main case for the four retainer bolts and 12 PTO bolts are open ended, so you must use new bolts with factory applied threadlocker or apply Threadlocker (S24200) to your existing bolts to prevent oil seepage past the bolt threads. See my TM1003 NV4500 Shop Manual or V1003DVD NV4500 Overhaul Video for more information. Lubricant and Chemical List for NV4500 Transmissions QU90020 NV4500 Manual Transmission Oil QU90003 Anaerobic Sealant QU90006 3.35 oz Ultra Black RTV Sealant QU90005 0.5 oz Ultra Black RTV Sealant S24200 6ml Threadlocker S9978 1 gram Threadlocker QU90003 Anaerobic Sealant QU90006 3.35 oz Ultra Black RTV Sealant QU90005 0.5 oz Ultra Black RTV Sealant S24200 6ml Medium Strength Blue Threadlocker S9978 1 gram Medium Strength Blue Threadlocker S9979 1 gram High Strength Red Threadlocker S24026 High Temperature Threadlocker for Mainshaft Nut
TOOLS for SPECIFIC NV4500 MODELS
|5th Gear Nut
Torx® Cross Bolt
|Output Seal Installer||N/A||QT1801||N/A||QT2058
|Not Used||Not Used|
|Tailshaft Bushing Remover and Installer||Not Used||Not Used||Not Used||QT2044||Not Used||Not Used|
TOOLS For ALL NV4500 MODELS
Front Bearing Cup Installer
|QT1802||Use with QT1101 or QT1119 Driver Handle. Also can use flat side to install Dodge 4x4 Rear Output Seal|
|Countershaft Front Bearing Installer||QT2004||Can also use to press 3-4 Synchro Hub on original equipment mainshafts|
|Input Bearing & Countershaft Rear Bearing Installer||QT2005||Can also use to install Input Seal|
|Input Bearing Cup Installer||QT1801||Use with QT1100, QT1101, QT1116, or QT1119 Driver Handle.|
|Countershaft Support||QT2006||Use to support front of countersahft when installing countershaft rear bearing|
|1-2 Synchronizer Support||QT2008||Use to support 1-2 synchronizer hub during synchronizer assembly|
|10mm 1/2" Drive 12 Point Socket||QT1020||USA Made Impact Socket for Factory Tailshaft Housing Bolts|
|Long Shank Punch for Shift Lug||QT9300||3/16" x 8" Shank for 5th Gear Shift Lug Roll Pin|