The T5 in the Jeep is more related to the T176 because they both use gear oil and both have bronze syncros that get killed by the sulfur I believe it is in gear oils with the GL5 rating.
The 'World Class' T5 in the Mustang needs thinner fluid like ATF because it uses nylon syncromesh.
ealier non world class t5's have fiber bonded to steel syncos in the lowers gears and a bronze in 3r,4th and 5th i beleive..the 1985-89 world class has fiber lined syncross in 1234,and bronze only in fith..the 90-93 has a carbon fiber lined synro assembly in some gears and then bronze in others..
the big difference in the needle bearings under the lower gears on the mainshaft..they need the thinner oil..
the jeep or non world class calls for gl5 wich do not have the needle bearings..
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Texas, I wasn't trying to be grumpy! But I have found that manufacturers of most aftermarket products don't really go to great lengths when publishing specifications. Regretfully, Lube marketers are among the MOST misleading of the bunch I even looked at a Mitchell Service book and they recommend GL-5 for ALL Jeep manual transmissions in 1986. Obviously that is incorrect since standard GL-5 will ruin the synchronizers in a T-176 rather quickly. I have found it is much better to compare at least 2 or better 3 recommendations before accepting it as factual. Being a certifiable 'old geezer', I steadily come across published information that I KNOW is incorrect due to the fact that I was THERE when it was NEW!!!
I also have a letter (a PAPER one) from these folks stating that their GL-5 uses a Hypoid Additive that is NOT corrosive to Bronze or Brass and is acceptable for use where GL-4 is specified. That does NOT mean thatany GL-5 is acceptable in place of a GL-4.
Also read on this site under 'product description' referring to Brass!
I just want to clarify that I statements made were not based on faulty information. I don't know a lot, but when I post on the forum I make sure I'm not making statements that would mislead or otherwise cause a misunderstanding with another forum member. The information posted regarding the use of Amsoil in the T5 and other CJ transmission is based on information straight from the company. Here's a link, http://www.amsoil.com/storefront/mtf.aspx, scroll down to the application list and it clearly shows that this lubricant is rated for the transmission.
Didn't mean to open up a can of worms with the post, but it has led to an interesting discussion.
I have read here in a fairly recent thread that there is a new high tech GL5 out that won't harm the syncros in the older trannies. I believe it was synthetic also.
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Just for clarification neither of the Amsoil products will harm the brass synchros. The MTF is a 5w-30 and the MTG is a heavier 75w-90. For a reference, I'll use Mike's Jeep, a 1986 CJ7 with a T4, T5 or T176 would use the ligher weight MTF. The MTF is for non E-P applications where the MTG is needed where an extreme pressure GL-4 gear lube is specified, including those where high horsepower/high torque engines and towing or heavy loads increase transmission stress.
Alot of daily drivers are using the lighter weight MTF and are extremely happy with the shifting performance and have not taken hits in the performance/ protection department. The newer 6-speeds have lots of guys talkin about "clunky shifts". I have several jeeps using the MTF in the 6-speeds that are very happy with its all around performance.
I posted the weight differences in the two oils just to help you keep them straight as they have both been discussed. Anyone still unsure or have other questions please ask. -Gabe
Bruce, no hard feelings. I didn't intend to be so anal in my reply, sorry about that. Yeah, the Syncromesh product description says the same thing about brass syncro compatibility. Either way, it's good to get things like this out in the open for future readers seeking clarification. So I'll get this stuff in sometime this week and I'll be sure to post a short-term/long-term update to let everyone know how it works.