Change To Syn Gear Oil Now!

[GV27]

this whole talk about gl-5 eating at (brass)syncro's makes me think that is the problem with our trannys the whole time.

Absolutely, positively without a hint of any doubt of any kind, NO! EP oil compatibility is well understood and is not an issue in any transmission rated for GL-5 oil. In fact, most modern transmissions will run on it just fine, rated for it or not. It's mainly a problem with people who try to run a GL-5 oil in their '60's classic car.

[Darrell]

I can't believe I read through this whole thread. Two years in the making. Very interesting opinions though! I got a kick out of how about halfway through everyone seemed to take a liking to GM's Syncromesh at balkamp's suggestion. Good deal.

I'm at 12,500 right now, but I think I'll just check the fluid at 15,000 and stick with the stock fluid until about 30,000 unless the stock stuff looks nasty.

So what's the recommendation for the rear diff? Will any synthetic 75W-90 of choice do the job?

[Retro]

I can't believe I read through this whole thread. Two years in the making. Very interesting opinions though! I got a kick out of how about halfway through everyone seemed to take a liking to GM's Syncromesh ad balkamp's suggestion. Good deal.

I'm at 12,500 right now, but I think I'll just check the fluid at 15,000 and stick with the stock fluid until about 30,000 unless the stock stuff looks nasty.

So what's the recommendation for the rear diff? Will any synthetic 75W-90 of choice do the job?

Are there pro's and con's to using a super slippery sythetic in the rear LS? I see these things in the stores that talk about locking up and chatter. I put Shockproof lightweight in my rear differential and it seems ok to me.

[AFP520]

this is an older thread.. but ive read through here regarding brass synchro's... if the trannies have them, Pennzoil Synchromesh http://www.pennzoil.com/products/gea...cro_fluid.html worked excellent on my 90 Eclipse GST... im not sure if we are able to run it in our trannies, but i will tell you that cold shifts shift like butter, and overall i felt like i had a brand new transmission..

i think another product thats similar is BG Syncrhoshift.. but ive never used/tested it

[modster]

On related issue, would there be any problems putting any aftermarket gear oil (gm/redline/etc) into my '04 wrx w/ 93,000 miles? Im getting a little grinding when going into 5th gear and only with engine speed over about 2000-3000rpm's. Thanks for the help

[aznwrx04]

changed to bg ultraguard (trans and diff), and honestly i dont think it was worth it ($20 per a quart). it feels very similar. my 1st and 3rd synchro still feels extra notchy. i think ill try shockproof.

[Big Sky WRX]

Who makes ultraguard?

[AFP520]

Who makes ultraguard?

aye.. i never even heard of it

[testes1010]

I put Shockproof lightweight in my rear differential and it seems ok to me.

I've been running Redline Shockproof Lightweight for +40k miles throughout the whole drivetrain....it is excellent, I highly, highly recommend it....no grindage whatsoever, also there was no metal found on the magnet plugs when I changed it out about 5k miles ago.....from the look of the oil it could have ran much longer than 35k miles..

[AFP520]

well ive read up completely through here and i have experienced the synchromesh.. so i decided i will be running all of that in my transmission.. but im still torn between redline 75w90ns or shockproof (light or heavy) in the rear...

[AFP520]

just switched over to full synchromesh in the trans and WOW... totally smooth now.. no hesitation what so ever... trans didn't grind before, still doesnt grind now.. i can get into first from second around 10-5mph in that area... doesnt grind and you cant hear the gears as much as before...

next is redline shockproof in the rear... gotta order some

[Damien02WRX]

Has anyone ever used any Lucas oil products in their transmission? I am going to put Lucas 75W90 synthetic in the trans and diff within the next week or two and post my results up here. My 02 WRX has cold 3rd gear grind, and almost impossible to get into reverse.

[300zrex]

hey men. i got a 2005 wrx with about 26,000 miles on it. you think its about time to change the transmission fluid yet? tell you the truth...ive never even looked at it? im so bad. if its time to change \, what kind do you guys reccomend? Thanks for the help...

[Damien02WRX]

I finally got around to putting the Lucas 75W-90 in the transmission and diff, all I can say is it made a considerable difference. There is no more gear whining when decelerating and downshifting, overall shifting between gears is smoother, and getting into reverse gear is a breeze now. I did notice this morning when leaving for work, I still had a little bit of cold 3rd gear grind. I have to say I am satisfied with Lucas' oil. Here is a link to what I purchased:
http://www.lucasoil.com/products/dis...tid=2&loc=show

[Big Sky WRX]

Report back in about 5,000 miles- that will be the real test. When I first swapped in M1 (many, many moons ago) I thought it was great- didn't take long to find out it was much too slippery.