i was told that i should put lucus synthetic gear oil 75-90w in my tranny. said it would help it shift better. right now the truck doesnt like to come out of fifth gear unless i disengage the clutch twice. has anyone ran lucus in their tranny, does it help? or is there a better oil i should use. i am goin to change all of the fluids in the truck. is there any particular oil i should put in the rear diff. does any one know how many quarts go in the tranny and rear diff. also does the 12v hold 12 quarts like my 24v or is it different? thanks for any info.

just bought:
1998 12v ctd 5 speed manual dually
279,xxx miles
work truck with walk in toolbox

bought new
2006 ctd qc 4x4 6 speed manual dually
b and w hitch w/ prodigy brake contoller
51,xxx miles
stock

 

12valve 11.5. on the tranny the only thing you need to watch is make sure you get the right stuff. the syncros tend to fall apart and deteriorate with the cheap stuff. you wont do it often so why not spring for the goods. cant remember the requirements of the oil but ill look tomorrow.

 

thanks i check back tomarrow

 

only use castrol syntorq or the amsoil equivalent.....ONLY! Sounds like there is something wrong with trans or clutch.hydraulics if not coming out of 5th gear. Nut may be backing off.

 

Its Castrol Syntorq LT 75W85 GL-4. I have run many oils and amsoil and all the others and none shift as good as the right stuff. You can get it at dodge or chevy and some parts stores. its around $20 per qt. Dont skimp. Takes 4qt but I run 5qt just becose.

 

Listen to what he says. Other oils will eat your syncros.

 

there ya go i knew someone would chime in.

 

i bought the amsoil MTGQT Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL4, so ill let u know if notice a difference after i change it. thanks for the help


Bought new:
2006 CTD, Quad Cab, 4x4, 6 speed manual, dually
Jacobs exhaust brake
B & W turn over hitch w/ Prodigy brake controller
51,xxx miles

Just bought:
1998 12v CTD, regular cab, 5 speed manual, 2wd, dually
With 9’ walk in tool box

Towing:
20’ flat bed Mid Atlantic Gooseneck with hydraulic dump bed
14’ Easy Dumper
18’ tilt back flatbed

For fun:
1995 Jeep Wrangler w/ 33” baja claws
Lots of mods set up for the mtns
2003 Yamaha big bear w/ 29” tires
1982 jeep wagoner aka the “War Wagon” it goes anywhere and doesn’t matter what happens to it. 35” BFG soon to be 37” swampers

 

I hope it works better for you than it did for me. Didn't hurt them but made thim slick and not work well and was hard to shift. It worked fine for a few K but then got harded and harder to shift. Flushed it out and put in the other and it worked fine. Let us know how it works.