2nd gear synchro FIX- MT owners read this thread

[tracerit]

Originally Posted by jmaryt

in my experience,i would say just drive it and see if it doesn't smooth out over time! i 've owned a lot of sticks over the years,and ALWAYS,they smoothed out just by driving with zero fluid changes..just sayin'

yeah, i'm gonna pay closer attention over the next few weeks driving but will be going through all 15 pages here to be a bit more knowledgeable as well.

[Huehuecoyotl]

Originally Posted by jmaryt

in my experience,i would say just drive it and see if it doesn't smooth out over time! i 've owned a lot of sticks over the years,and ALWAYS,they smoothed out just by driving with zero fluid changes..just sayin'

for sure, this will happen in time!

even then, wifes car has more miles and we left hers with factory fluid
mine is oh so much soother, its just really a matter of preference.

[victorb]

Today I changed my transmission and differential fluids.

Used Motul Motyl Gear 75w-90 GL 4/5 for the transmission and Mobil 1 75w-90 LS GL5 specific for the Differential (with friction modifiers)

Transmission magnet did not look bad at all, just tiny metal flakes in black color.
The differential magnet caught a lot of black metal flakes and assembly lube, really looked nasty.

Cold Shifting after changing to Motul Motyl 75w-90 was better, no more grinds, but still hard to shift (shift with force), but grind is gone. I did not use Motul gear 300 as it is too slippery-thin and expensive (double the price).

The differential on the other hand is much smoother with the Mobil 1 LS, LSD engagement is a bit earlier, more fun and smoother.

Very happy with the results. cheap assurance and protection =)

[Huehuecoyotl]

Originally Posted by victorb;849257
Cold Shifting after changing to Motul Motyl 75w-90 was better, no more grinds, [B

but still hard to shift (shift with force),[/B] but grind is gone.

You should probably start your own thread recommending that oil.

Good for you

This is about pentosin, and its an improvement, so mine isnt hard to shift AND doesnt grind. You'll have to live with hard to shift I suppose. Congrats, I think.

[victorb]

Originally Posted by Huehuecoyotl

You should probably start your own thread recommending that oil.

Good for you

This is about pentosin, and its an improvement, so mine isnt hard to shift AND doesnt grind. You'll have to live with hard to shift I suppose. Congrats, I think.

Yes boss will do. Even on pentosin, my friends car is hard to shift to 2nd when cold. Thats the characteristic. Of the aisin transmission. Congrats yours is easy to shift (broken sycro).

[Chimpo]

Originally Posted by victorb

Congrats yours is easy to shift (broken sycro).

Um.... what?

Everyone please play nice.

Back on topic: I've got three bottles of Pent sitting at home that I'm very excited to try. Hopefully can get them in when I'm home this weekend.

[Huehuecoyotl]

Originally Posted by victorb

Congrats yours is easy to shift (broken sycro).

Not quite. You should read the review that was just posted by 3rd party drivers of my ride. And passengers.

[victorb]

Originally Posted by Huehuecoyotl

Not quite. You should read the review that was just posted by 3rd party drivers of my ride. And passengers.

I hope so. Hope passengers and riders feel it.

Anyway, will give pentosin a try after 10,000miles

[roddy]

I continue to be impressed with how well this stuff works. Gem, don't let the naysayers bother you...I'm glad that you recommended it, and that I listened. Truely a case of getting what you pay for. I've already filled the trans in the Mustang and can't wait for the weather to turn. If it makes even 1/2 the difference there as it did in the FR-S, I'll be grinning from ear to ear (won't hold my breath though...the Tremec T5 transmission is a steaming pile of poo).

[alex_86]

currently you should be filling your transmission with 4.7q of oil i dont know where 3q came from but also the rating is also 75w-90. please do research before you change your oil.

[Jeffsu350]

It's 2.3 qt for the tranny ...

http://www.ft86club.com/forums/showthread.php?t=19218

[alex_86]

weird there seems to be a miss print on the online subaru service manual ill get back with everyone on this.

[AndyB]

Does anyone have a lot of track time on the Pentosin? I am an ex-vintage car racer, so I'm used to having to double clutch a cold transmission to get it to shift smoothly until warm, but one thing I learned about tranny oils is that you should pick your oil for how it works fully hot and fully loaded. The trans case is aluminum, while the shafts and bearings are steel which means they expand at different rates and different total degrees. If your input shaft and drive gear shaft spread a few thousandths of an inch at 200 degrees (because the aluminum case expanded) while the oils viscosity has thinned by half, the conical synchro ring will engage at a different point of the shift throw. With stock oil you can slow the speed of your shift selector when cold to accommodate for this.

IMO, if you are driving your car from cold for 20-30 minutes to work/school the Pentosin sounds like it is actually better for the transmission. If you track the car in a warm climate and you are NOT double clutching and match-revving your downshifts perfectly every time (who can do this?) I would be very careful to choose an oil that isn't so thin or slick at temp, that it bypasses the synchro. An synchro break at a 7000rpm downshift puts "gravel" in the gearbox that can split the case, break teeth or give you 6 neutral gears.

To summarize, I am not saying anything against any of the oils or advice given on this thread. I am asking you to think about your application, driving style/skill, and take responsibility for good decisions on the information you have gathered.

[digital_assassin]

From what I've seen on this forum, Gem (OP) tracks his car regularly and in the Phoenix area.