QU10521 Reverse Light Switch with 2 Spade Terminals 1993 & Older Dodge

QU10521 Backup or Reverse Light Switch for Most Dodge Manual Transmissions 1972 to 1993 including NP435 4 Speed, 1989-1993 Dodge Getrag G360 5 Speed, and 1992-1993 Dodge NV4500 5 Speed Transmission. QU10521 is a replacement reverse light switch that fits almost all 1972-1993 Dodge New Process 3, 4, and 5 speed manual transmissions, 1992-1993 Dodge New Venture NV4500 5 speeds,  and  1989 to 1993 Dodge Diesel trucks with Getrag G360 5 speed manual transmissions. Also used to replace a bad switch on a Quad 4x4 NV4500 retrofit transmission in a 1989-1993 Dodge Diesel (replacing the Getrag G360). Limited Supply.

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!

Dan the Gear Man® Tech Notes:
Gasket
Test
Lubricants, Sealants, Threadlockers
Special Tools
Applications

Tech Note 1: Gasket
Many of our switches come with an o-ring, however, for most applications including NP435, Getrag G360 and New Process NV4500 Transmissions, replace the o-ring with QU10147 Gasket.

Tech Note 2: Test
QU10521 is a normally open switch. Before ordering a new switch, test your old one by connecting your circuit tester to the two spade terminals and depressing the poppet ball. If the switch is good your tester will light up when the ball is depressed.

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 VSG1003DVD 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 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

Tech Note 4: Special Tools
Need Torque Specs or Rebuild procedures? Order my 116 page, full color illustrated TM1003 NV4500 Rebuild Manual. You will need some special tools to correctly service your NV4500 Transmission. The chart below lists our current NV4500 Special Tools for popular models.

Applications:
Dodge:
Diesel trucks with G350 5 speed transmissions: 1989, 1990, 1991, 1992, 1993
Quad 4x4 NV4500 retrofit transmission in a Diesel (replacing the Getrag G350): 1989, 1990, 1991, 1992, 1993