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I need to change my fluid since i have no idea when it was done last. I have red sooo much on different schools of thought. Gear lube or ATF or syncro.
I will be doing very little off road or non at all. Just driving around town and to the beach. No a daily driver. But, I do want the best for the T-5 . My CJ7 is a 1984 with the inline 6. Also, what is the process to change?
My Chiltons doesn't really give a good process for that. I am about 90% sure I have a non-worl class in there.
Looking at the owners manual for my '86 a T-5 takes 75w-90 gear oil. From what I have read the earlier CJs stated that it should be atf, but was changed to gear oil in a later supplement. Besides wouldn't you rather run gear oil than atf in a weak tired tranny like a T-4 or T-5 ?
Yeah, I think gear oil is what I am going to go with. synthetic gear oil, what weight for syn is the best. I read reagular gear oil would be about 80 weight.
The Borg-Warner T-4 and T-5 was of a passenger car design and has a cast aluminum housing which is a bad sign. The internals will be O.K. on the street in o.e.m. form, but not when you start making changes to that design, especially when the torque is multiplied thru the Transfer Case . The later model Wranglers had their transmissions upgraded. Also compared to the other manual transmissions that came in the CJs like the T-176 and the T-18 , those weaker transmissions don't look so good.
1978 CJ7
Silver paint with black hard top on 33" radials & eagle alumium rims. Good looking ride and have done lots of work to make it look and run great.
Stock equipment is 258 carb, power brakes, power steering, hard top & hard doors (per vehicle gross weight) tilt steering wheel, big brake package with large rotars & drums, T18 Trans with low 6.4 granny gear, Dana 20 transfer, Dana 30 front axle, Dana 44HD rear axle with 3.73 gears. True Trac ft & rear.
I was around jeeps in the 70's and drove a 1973 Jeep Truck. My family had 4 jeeps at the time. We also joined a jeep club back then too. So about 6 years ago looked for a Jeep CJ and found the vehicle above.
Yes there is a ton on this subject.... I will also say many many jeepers put the wrong gear lube in the Transmission and Transfer Case ...... ANOTHER FLUID THAT IS BAD FOR OUR JEEPS.... NO KIDDING
I did a lot of research, LOT, the 70s FSMs all say to use GL4, Jeep had some bad recommendations and use GL5 in the early 80s and has a full product line recall and Transmission were failing left and right.... So there is wrong info in the early 80s FSM, then they used "fish oil" and a Jeep Specific Part Number to fix the situation in the next couple of years...
USE the same NAPA GL4 in the Transmission and Transfer Case ...... or use the AMSOIL MTF. All the Jeep CJ Transmission /Transf from the 60s, 70s, 80s.
NAPA can phone order GL4 in gallons,
and when I first found this 4-5 years ago it $15/gal and is now $25/gallon. So nice of them after I start selling their product and educating JEEPERs & my local Napa Counter they nearly double the price...
STORY OF MY T-18 Failing...
Wanted to do pm 6 years or so ago....My 1979 FSM that I use for my 1978 CJ7 (very similar) said to use GL4. I went to 20 places and could not find it. USE what many have the GL5 and in a few months my Transmission started to fail..... hard 1st, 2nd for normal starts non granny, and reverse, shift for 2nd to 3rd, and any down shifting was getting stiff and felt my Transmission was failing and need work.... 34,000 orginal miles. Crusty gave me a blurb to try the GL4 at Napa, and showed me the container/mfg..... Well in hours, days, weeks it was better.......... IN 2 months of little use my Transmission seemed to never have problem.... it as all corrected....
I will also say....
When you Transmission RATTLES going down the road.... that is your syncros and if you use the right fluid it will GO AWAY..... I cannot imagine how many jeepers are building Transmission that just need the right fluid...
USE the Amsoi MTF, you will be extremly impressed.... no sht no bll
the price is $9 to 12 qt and many auto stores have it.... MY napa carries here in MN...... TOTALLY SHOCKING HOW WELL IT WORKS....
FSMs also say if you have hard shifting, noisey, and transf does not shift well it may be the wrong fluid...
GL5 is corrosive to yellow metals, copper, phozbronze, brellium copper, brass, etc. Used in syncros and bushings... Has higher levels of sulfur or clorides and / or other cleaning agents... IN ADDITION the lubrication properties are different than GL4 and the GL5 does not have the friction modifers to help the syncros and shift work properly...
USE the GL4 then try the AMSOIL MTF you will never go back or change from the AMSOIL.... AMSOIL also lists all our Jeep Manual Transmission right on the back lable by part number...
WORLD CLASS T-4 / T-5 means they use carbon fiber syncros and few minor changes on the gear if memory serves correct. NO jeeps came with world class versions... They are in mustangs. Jeep T-4 /T-5 use gear lube and I would use/recommend the Amsoil MTF
NAPA GL4 SAE 85w90 Gear Oil GL4 (also meets GL3) Part #SL24239 Mfg By Sta-Lube, sibisdary of CRC Industries Bar Code 72213-24239 $30/gallon, phone order take 1-2 days to arrive, then pick it up, easy
I NOW recommend the Amsoil MTF Manual Transmission Fluid as the best with dozens of tests/feedbacks.....,
NOte... Mobil 1 Synthetic Gear Lubes also tested out well $8-12/quart and is non corrosive.. Valvoline GL5 DYNO Gear Lube is also non corrosive but is a GL5 and getting a Gear Lube that has the right lubrication properties will shift better, another words a GL4 will Shift better than a non corrosive GL5
Bromgarrds Farm Stores, IA, NE, Co, Midwest area also have a GL4 gear lube. Sell 2.5 gal container for like $27.
1978 CJ7
Silver paint with black hard top on 33" radials & eagle alumium rims. Good looking ride and have done lots of work to make it look and run great.
Stock equipment is 258 carb, power brakes, power steering, hard top & hard doors (per vehicle gross weight) tilt steering wheel, big brake package with large rotars & drums, T18 Trans with low 6.4 granny gear, Dana 20 transfer, Dana 30 front axle, Dana 44HD rear axle with 3.73 gears. True Trac ft & rear.
I was around jeeps in the 70's and drove a 1973 Jeep Truck. My family had 4 jeeps at the time. We also joined a jeep club back then too. So about 6 years ago looked for a Jeep CJ and found the vehicle above.
yes the Amsoil MTF is for the Jeep Manual Transmission /Transf and is not corrosive....
Take a 20 min drive in warmer weather, drain hot. I also use a stick magnet to see if any metal pcs or fillings on the bottom of Transmission .
Fill up to the fill hole do not need to fill till is spills out, just up to is fine.... Walmart also has a nice plastic adapter for oil containers with a on/off valve that will go ontop of the quart bottles... I use a pc of plastic tubing so its easier to fill up. This way you can let the gear lube gravity feed, or squeeze to help it along..... if you squeeze a lot the Wally valve will leak a bit. Plastic tubing will be close to 1/4" but once you have the Wally World Valve you can buy tubing to fit, like a ft long. Use cardboard on the floor so incase you spill, many times does spill a bit, cardboard will lower the chances of makeing a bit of mess mess with spilled gear lube...
I also put a magnet on the drain plug of Transmission , transf, engine, and want to put on on the ft/rear pumpkin.... Collects little pcs of metal and also tells you pretty quick if you have isssue/failure?
Glad I could help.... post back after you try the Amsoil MTF
I think you will be impressed!!!