advice for diesel 5-speed
05-17-2005 | 11:28 AM
#1
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advice for diesel 5-speed
I have a 2000 1-ton Dodge diesel with manual 5-speed trans. The book says that I do not have to change the fluid in the trans., just keep it filled. The book on new Dodge 1-ton diesels with manual 6-speed says you should periodically, 35-40,000 miles change the fluid. If it would be best I change the syn. in mine, what weight and how much to fill it? Thanks for your advice.
05-17-2005 | 03:29 PM
#2
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From: Red Deer, Alberta Canada
The "best" oil is up for discussion, however it is very important that the oil comply with the tag on the transmission.
Most don't fool around and replace the fluid with the OEM fluid. Thats what I did. Trying to find a compatible oil around me was very difficult, so I stuck with the OEM GL-4 Synthetic oil. (Castrol SynTorq not Syntec)
Using the improper oil will cause early failure of the transmission.
Most don't fool around and replace the fluid with the OEM fluid. Thats what I did. Trying to find a compatible oil around me was very difficult, so I stuck with the OEM GL-4 Synthetic oil. (Castrol SynTorq not Syntec)
Using the improper oil will cause early failure of the transmission.
05-17-2005 | 05:50 PM
#3
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From: NE Wisconsin
The OEM Castrol Syntorq LT is a synthetic 75W-85 GL4 lubricant. The capacity is 4 quarts.
I believe you can order it from standardtransmission.com for around $54 a gallon.
Redline,a synthetic lube manufacturer offers GL4 transmission lubes, and recommends a 50/50 mix of their MTL/MT-90 to get the desired viscosity for the NV4500. Usually $7-$9 a quart.
Specialityformulations.com is a newcomer, and offers a full synthetic 75W-85 GL4 manual transmission lube called MTL-P, for $28.95 a gallon. I've been running this stuff now for two months, and couldn't be happier with the way the transmission now shifts.
GL4 lubes usually contain 1/2 the phosphorus and sulfur content of GL5 lubes, so as not to attack the yellow metals in transmissions. They also contain the proper coefficient of friction to allow your synchros to function properly. Some synthetic manufacturers will claim their across the board GL-EVERYTHING lubes will work fine in transmissions because they contain "inactive" sulfur, but may prove to be too slippery for the synchros. Just beware. GL5 specification is for final drive axle differentials, or dog box type transmissions that do not have synchros.
And, the NV5600 uses a lighter viscosity lube, 70W-80, and is commonly called synchromesh.
I believe you can order it from standardtransmission.com for around $54 a gallon.
Redline,a synthetic lube manufacturer offers GL4 transmission lubes, and recommends a 50/50 mix of their MTL/MT-90 to get the desired viscosity for the NV4500. Usually $7-$9 a quart.
Specialityformulations.com is a newcomer, and offers a full synthetic 75W-85 GL4 manual transmission lube called MTL-P, for $28.95 a gallon. I've been running this stuff now for two months, and couldn't be happier with the way the transmission now shifts.
GL4 lubes usually contain 1/2 the phosphorus and sulfur content of GL5 lubes, so as not to attack the yellow metals in transmissions. They also contain the proper coefficient of friction to allow your synchros to function properly. Some synthetic manufacturers will claim their across the board GL-EVERYTHING lubes will work fine in transmissions because they contain "inactive" sulfur, but may prove to be too slippery for the synchros. Just beware. GL5 specification is for final drive axle differentials, or dog box type transmissions that do not have synchros.
And, the NV5600 uses a lighter viscosity lube, 70W-80, and is commonly called synchromesh.
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