trying to find a different weight transmission fluid

[AlphaAssault]

after using a several different fluids in my transmission, i have found that the fluid itself is whats causing the excessive notchyness. i dont know what was in the trans when i bought the car, because it all leaked out; that stuff worked the best though. ive tried penzoil syncromesh, and it sucked. too thin, i think. right now im running a 75w90 (or there-abouts) gl4 synthetic fluid, and it works much better, but the trans still sticks sometimes. when the fluid has warmed up, the trans gets notchy. when the trans is cool, it shifts like butter in every gear. it did this even with syncromesh. ok, so my question: does anyone know of any gl4 rated fluid thats rated above 90w? like 90w105 or something? it doesnt have to be synthetic, but it needs to be as heavy, when warm, as stock fluid is when cold. anyone heard of such a fluid?

im seriously entertaining getting some 90w140 synthetic fluid for my transmission. is this too thick or not? ive heard of some people running fluid that thick on this site. could running a fluid like that hurt anything?

 

[DSM1G90]

Damn! Like shifting in molasses with that heavy stuff! 90w/140 is good for racing, not daily driving.

I use REDLINE MT-90 in my Ply Turbo and have been very pleased with this fluid .. and it's like a 80w90.

It used to snarl the 1st/2nd syncros when shifting from 1st to 2nd and before I did the drain. Now that I put in the MT-90, it shifts like a hot knife through butter .. even when it's -10 outside when starting up for the day.

BUT, if you got sticky problems, do this trick to see if your syncros are being grumpy: With the motor in idle, run the shifter through the "H" pattern WITHOUT dumping the clutch (forget about reverse since there is no syncro attached to this gear).

If the motor slows down a bit when pushing the shifter towards a gear, then that set of syncros is okey. But, if one grinds on you as you push in the shifter, then that set of syncros are shot since they're not braking the input shaft down.

..and no kind of tranny fluid will help you in this case... time for a rebuild.

-good luck ..... DSM

-DSM

 

[nkosi]

hey man i use a 90w140 non-synthitic gear oil but i only drive my ride in the summer...i find in the summer heat of canada anything less is too thin..i just let the car build a little heat before i go... if you drive winter you need a weight thats a little lighter.

 

[blktalonawd]

The 90/140 is a little thick. You said that you know it is the fluid that is the problem but stated it happens with the syncromesh and the gl-4 your currently running. If this is the case how is it fluid related. Is your problem just in one gear? Or is it just shifting from one gear to the other? More than likely it is going to be a worn hub/ slider,springs, keys and syncros. This all sounds like an lot but it is all in the same area and all are wearable parts. These are all covered in a rebuild. Hopefully if it is grinding that it has worn the engagement teeth to an irreular angle and would then need the gear to go along with the rebuild parts. All of this can not be fixed by changing fluid only masking a potenial problem. It could also be as simple as adjusting shift cables and making sure that nothing is loose and getting good shifter bushings. Either way Good luck

 

[Imback]

TRE, Jacks recommend using DIAQUEEN MR TRANSMISSION FLUID part #mz313376. After reading about it that is the next fluid i will be using when i change my tranny fuild again.

 

[DSM1G90]

DIAQUEEN MR TRANSMISSION FLUID part #MZ313376.

..Hmmm.... is spending close to $90 bucks per gallon worth it .. and a fluid made for EVO differentals?

EVO 8 and 9 Performance Parts - EvoMoto.com I just don't agree using BG Syncomesh in this recommendation...

 

[Defiant]

after using a several different fluids in my transmission, i have found that the fluid itself is whats causing the excessive notchyness. i dont know what was in the trans when i bought the car, because it all leaked out;

You're probably past the point where a pour-in will fix anything.

 

[AlphaAssault]

i put the car in neutral, pulled my foot off the clutch pedal, and ran the shifter through the H motion. no grinding, and the engine dropped about 50rpms each time i moved the shifter. syncros seem to still be in good condition.

 

[toofast82]

Have you considered trying the Lucas Oil Stabilizer? It says on the bottle its fine for manual transmissions.

 

[MichaelSuch]

I used 2 qts of Redline MT-90 and the rest of MTL to fill it up and it shifts very smooth, but then again I had a transmission shop put in a double cone sychro, but after that and a clutch kit it shifts amazing. If I would use anything again, it's definately Redline MT90.