| Author | Message | ||
| dutch (Dutch)
Registered Member Username: Dutch Post Number: 62 Registered: 2-2007 Posted From: 216.9.250.63 Rating: N/A |
I get mixed recommendations for my transmission fluid for my gm4106 1964 . What do you recommend fellow nuts???? | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1087 Registered: 5-2001 Posted From: 65.74.65.197 Rating: N/A |
Dutch, it takes motor oil, the same as the engine, unless you want to experiment. For what it's worth. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 351 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
If it is the same as the 4104, and I believe it is, it takes 50wt Aviation Grade oil which is mineral oil, or break-in oil in aircraft engines. These transmissions have oil pumps so 90wt gear lube should never be used. All this is in the lube section of the manual. | ||
| Jim Rink (Fakeguy)
Registered Member Username: Fakeguy Post Number: 34 Registered: 1-2005 Posted From: 24.33.85.105 Rating: N/A |
I HAVE 62 4106 with 8v71...use same as engine...in my case straight 30...is what my original manual says although most guys use 40w. I am told should be same in both engine and tranny on either weight. | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1233 Registered: 12-2000 Posted From: 67.181.161.137 Rating: N/A |
Dutch - Per the shop manual - use the same oil you use in the engine. Simple. However, this is one area where, if you want to spend the $$$, you can use straight 40wt synthetic oil with no harm, and possibly some improvement. FWIW & HTH. . .  | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 354 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
This is a puzzle to me. I assume the trans are the same in both the 4104 and 4106 but the oil is different? But maybe they aren't the same. Very interesting! | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 561 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
They are different....the angle drive is on the front of the 06, and on the rear of the 04. Don't know about the internals, without a parts book, as I've never had one apart. | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1235 Registered: 12-2000 Posted From: 67.181.161.137 Rating: N/A |
Gus - The powertrain layout is different between the 4104 and the 4106, as John pointed out. The 4104 is set up engine, clutch, transmission, bevel gears, drive shaft, rear axle. The 4106 is set up engine, clutch, bevel gears, transmission, drive shaft, rear axle. GM had to move the bevel gears when they discovered the greater torque output of the 8V71 was destroying the original design as used in the 4104. The rear axle pumpkins are also off-set differently, another change made with the introduction of the V-8. And, as I just posted in the other thread, they changed the transmission oil requirements at the same time, too. FWIW & HTH. . . | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 357 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
I knew the powertrain lineup was different but does that mean the trans are different? My guess it that it isn't but that is only a guess. | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1236 Registered: 12-2000 Posted From: 67.181.161.137 Rating: N/A |
Gus - What's the model number of your Spicer? I'll take a look at my '06's on Tuesday and we'll compare. . . | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 358 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
Russ, I'll have a look tomorrow, it's raining right now and it is parked a block away near my son's home in Seattle. | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1090 Registered: 5-2001 Posted From: 65.74.65.197 Rating: N/A |
Gus, the transmission number in our coach is Spicer 7145VC. I'm sure that the 4104 uses a different transmission because the bevel gears in the 4106 are built into the nose of the gearbox and the 4104 has them built into output side of the case. For what it's worth. Tom Caffrey | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 361 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
Tom, Sorry I haven't looked yet but have been very busy. I'll try to get to it tomorrow but you're probably right. I'm still curious though. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 362 Registered: 11-2005 Posted From: 71.112.176.74 Rating: N/A |
Tom, Curiousity got me so I went out in the rain and checked, it is a Spicer 7141-A. That must have been the end of the 50wt pumpers. |