well, i can't find my other post because i didn't subscribe to it and i can't remember the name to search for it but...

well, i had MT-90 put in my transmission yesterday and 75W90 in my diff and well, good lord did it make a difference. i feel like i'm shifting through gated butter. for all the haters out there that were on my last post... if you've not used it, stop giving opinions about its effectiveness, if you didn't notice a difference, maybe you're box was in such good shape before that its not noticable or maybe its in such bad shape that nothing can help anymore.

anyways though, i'm with batman on this one (which suprisingly i am quite often),
Redline >> anything else

 

So you've tried everything else?

What was in the tranny and diff before?

 

i've not used anything else in this car, but i have used different oils (valvoline, mobil 1, etc.) in other cars and noticed no improvement at all in the transmission feeling. granted, again, this may be due to the car, but its been a few cars that i tried it in and never noticed any improvement... this one though, was huge.

the oil before was just your basic OE recommened stuff (valvoline, penzoil, the likes).

i will subscribe to this thread and in a few months, see if i'm singing the same tune

 

I also went with Redline and felt a difference. But I'm pretty sure the fluid that was in there was OEM w/about 60k on it, and probably any quality fluid would have been an improvement.

 

i put in redline mt90, didnt notice any difference.... then again i hadent driven the car in 8 months so i was fuzzy on how it felt before :/

 

When I put synthetic NEO in the tranny and diff I immediately felt a difference in both. On the other hand the original glop I drained out of them was nasty. I do notice that in the winter time my shifter feels much nicer than other cars I have driven with mineral lubes...

 

I've tried all kinds of gear oil on many different RX-7's. Redline DOES make a big difference.

IMHO, I think most of the bad-*** synthetics - Redline, Royal Purple, NEO - are all pretty similar. One may be SLIGHTLY better than the other, but they're all leagues ahead of plain gear oil. They're also substantially better than even Mobil 1 gear oil - it's not as impressive as I would have hoped.

Big difference too when the temperature is COLD outside - plain gear oil it feels like mud, and a good synthetic will shift just as good as if it was hot out.

It's definitely worth the cost - I'd add 3 quarts of gear oil to the price of any tranny job (putting in a new clutch, going through the 5th gear synchro, etc.)

Dale

 

I'm planning on changing my tranny and diff fluid soon too, as I'm sure the previous owners of my car never did it. I'm thinking of going the Redline route as well. I would have done it already actually, but for some reason I'm having a hard time finding a pump device to pump the fluid in after the old stuff is drained, none of my local auto parts stores have this simple cheap device.

 

You can always get a long length of hose and a funnel. Stuff the hose into the tranny or diff and run it out from under the car. Raise other end higher than the driveline and insert funnel. Begin pouring.

I like doing it this way period because it takes a LOT of pumps to fill the entire tranny. I wore myself out with one of those little pumps the first time; maybe mine just sucked.

 

I like the hose idea. Those pumps can be messy. I find myself trying to hold the clip from coming out of the fill hole, and trying to pump with the other hand, while trying to watch both at the same time. Half the time something slips, and I get (expensive) gear oil all over the place.

I use redline in the tranny and rear end. I did feel an improvement after switching from what was probably OEM.

 

i guess, i misspoke when i said i agreed with Batman... after reading this, i realize, i've not tried any other top-end synthetics before... so...

Redline, Neo, Royal Purple >> anything normal

 

I just changed to redline in both the diff and the tranny, and noticed no difference. Of course the tranny was rebuilt about 15k miles ago by RP for the previous owner (Roy Hughes, who is now in Iraq with his guard unit, may the gods keep him safe), so the oil in the tranny (no idea what flavor it was) was only about 15k miles old.

I have a drill motor driven impeller pump made for changing oil in boat engines. Works a charm, $30 at your local West Marine.

Mike

 

Buy about 5' of fish tank canister pump hose. It's like a clear (sometimes green) soft plastic or something. Buy a small size funnel (smallest one) that will fit into the end of the hose. The total amount for both is like $10 or less, I think.

Use the driver side wiper to hold the hose and funnel. Route the line downard between the drivers fender and engine block, then along side the trans to the fill hole. Instert in a few inches to hold the line. Now hold the funnel that you inserted in to the hose as high as possible and pour in the fluid. (I used a mixture of Redline MTL & NEO HD)

Route the hose from above the rear fender/quater panel in to the wheel well above the wheel and then under the car, going back up a little and to the differential. Isert it in a few inches to hold the line. Hold the funnel up as high as you can and pour the fluid and it will rollercaoster in to the differential. (I used a mixture of Redline MT-90 & NEO HD)

 

Good idea, never thought of that. See, that's why I come here

I've used the pump before (borrowed from my dad) when I changed the fluid in my truck, and it took a lot of pumps too. I was pretty tired when I was done doing it.

I'll give this method a shot.

 

i changed from mobil ones tranny fluid to Redline (some kind of wacky ****) and no difference....Im hoping ill get some added benefit when i do my first two hpdes on nov 6th and 8th (when its like 33 degrees here in NY)

next time I goto a alms race im gonna ask everyone in the pits what they use