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Username Post: 1992 Chevrolet C1500 manual transmission fluid        (Topic#355633)
Posts: 280

Reg: 05-18-07
03-15-19 06:15 PM - Post#2762171    

I am changing the oil(fluid) in the transmission (5 speed with overdrive manual) and I cant figure it out what kind to use, the fluid listed on the manual is not longer manufactured, anybody knows what brand/grade to replace it with?


"8th Year" Silver Supporting Member
Posts: 4219
Loc: Salt Lake City
Reg: 06-20-09
03-15-19 09:23 PM - Post#2762194    
    In response to Sal

NV3500, right?


'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke

Senior Moderator
Posts: 28964
Age: 49
Loc: Texas
Reg: 08-01-03
03-16-19 06:05 AM - Post#2762211    
    In response to Sal

Both 5 speeds available at that time have 5th as overdrive. The difference is whether you have a low (L) first gear, or regular first gear. Low gear is the heavy duty NV4500 which was optional in 1500's but rarely seen in them. It requires GM Synthetic Transmission Lubricant part # 12346190

5 speed with regular 1st gear is the light duty transmission (NV3500, 5LM60, Getrag, several names/versions) and they use Syncromesh fluid. It is available in many brands. It is still available from GM (AC Delco) part # 10-4006


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

"6th Year" Gold Supporting Member
Posts: 2690
Age: 33
Loc: Utica ny
Reg: 04-13-10
03-16-19 12:49 PM - Post#2762241    
    In response to someotherguy

Yup Syncromesh.
I use Pennzoil. Yellow bottle. Looks like a gearoil bottle

Old School GM fan FOREVER

Edited by rockfangd on 03-16-19 12:50 PM. Reason for edit: No reason given.

Posts: 280

Reg: 05-18-07
03-16-19 06:06 PM - Post#2762262    
    In response to rockfangd

I looked at the casting numbers and they are GM 8679097 so it seems to be an NV3500, reading your comments synchromesh fluid is used for this transmission, I read some comments online about people using royal purple fluid and adding some lucas oil too, has anybody tried this with the 5 speed transmission? also how much oil does it take to fill it up to the fill plug?


Posts: 17

Loc: Western Slope of Colorado
Reg: 07-11-17
03-16-19 07:41 PM - Post#2762268    
    In response to Sal

Also original GM part# 12345349 Apparently it's still available.

Pennzoil made the fluid and also sold it under their name as Penzoil Syncromesh 3501.

Edited by alpinecrick on 03-16-19 07:41 PM. Reason for edit: No reason given.

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