I want to change the fluid in my 98 five speed tranny. What do i use. I want to use redline products because i have heard good things about them but i dont know whats in my tranny, ATF, gear oil, 80/90? i have no idea and i cant seem to find out. Thanks

 

Tranny uses 3.75 quarts of Mercon ATF. I use Mobile 1 synthestic but many use Royale Purple or RedLine. Use good quality and change every 30,000 miles.

 

Just to make sure, You are saying ATF for my manual right?

 

Fill it with GM syncromesh fluid. It is a fully synthetic fluid that works absolutely perfect in these transmissions. I have been using it in mine for 150,000 miles of pure abuse. Also it is considerably cheaper than most of the alternatives.
Alan

 

Where would i get it? And is there a specific weight i am looking for or is it just atf?

 

Ask your parts store for GM syncromesh. Tell them it goes in an S-10 or something like that. I believe it was supposed to be used in the "getrag" transmissions found in S-10's with 4.3 liter engines and fullsize pickups. I don't know the weight on it.
Alan

 

Would this be the stuff??

JMC

 

JMC,
Bingo

 

Something i just heard is that pennzoil makes that stuff for GM. I dont know how much truth is behind it but if thats the case, the pennzoil stuff is like half the price.

 

I have been running Redline MTL 1 part and redline ATF 2 parts for just under a year now. I had run pure MTl for a few months when the tranny chipped some teeth on the input shaft. The replacement rranny got Mobile 1 Synthetic ATF for 1000 miles then I went to the MTL/ATF mix. I am due for an oil change so I will try the GM stuff. How does it do in the cold? I mean 10-20° below 0°.

JMC

 

Just found this with Google;

http://www.stealth316.com/misc/pennz...oilsummary.pdf

JMC

 

Well I had really hard shifting with the atf in those conditions, I haven't had that problem since I switched to syncromesh. I have had my clutch line get frozen however. Or I got Ice on the throwout bearing area or something. I couldn't push the clutch in until I warmed the vehicle up.

 

According to that google article, the pennzoil stuff is the same as the gm stuff. I think i will pick some of that up. Who knows how long its been since mine was changed.

 

After reading this thread, I found this. Maybe it'll save some people some money, although I personally don't have a preference of any one brand....


http://www.stealth316.com/2-pennzoil-synchromesh.htm

 

If this helps great. I have an M5OD tranny I my 88 F-150 for the first 50K miles it never seemed to shift correctly, It was suggested that I dump and replace the tranny fluid with Mobil 1 synthetic 5W/30. since that time I have put more than 200K on it with yearly tranny fluid changes of the same with no complaints at all with performance