75subie Posted August 9, 2006 Share Posted August 9, 2006 i lost my owners manual and just finished the tranny swap in my hatch. what is the correct wieght and amount of tranny oil for a ea81 4sp 4wd? thanks Jon Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted August 9, 2006 Share Posted August 9, 2006 The first hatch I owned I drained out the old stuff and then put in mobil 1 synthetic 75w90.Comes in those little gray bottles with the pointed tip.It seemed to help shifting quite a bit.I plan on doing the same thing to mine this weekend.Some may argue that sythetic is not the best choice but I love the mobil 1 stuff and use it in everything that I drive. Quote Link to comment Share on other sites More sharing options...
75subie Posted August 9, 2006 Author Share Posted August 9, 2006 thanks Jerry, i`ll give that a try if i can afford it lol:lol: Quote Link to comment Share on other sites More sharing options...
jeffast Posted August 9, 2006 Share Posted August 9, 2006 shadow after testing many said that redline gear oil was the best to use, said it gave him way better shifting. better feel etc. Quote Link to comment Share on other sites More sharing options...
mikeshoup Posted August 9, 2006 Share Posted August 9, 2006 Or do as I do and just use Valvoline 80W-90. Its cheap, and works fine. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 9, 2006 Share Posted August 9, 2006 I too like the Redline, but there is really no fix for the crappy 4 speed. Only fix for that thing is to get yourself a 5 speed - smoother shifting, and no issues with syncros. GD Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted August 9, 2006 Share Posted August 9, 2006 Ya I too like redline better than Mobil 1.Just a little more expensive and harder to come by for me. Quote Link to comment Share on other sites More sharing options...
edrach Posted August 9, 2006 Share Posted August 9, 2006 I use the 75W90NS from Redline. The NS is an additive to promote friction on the synchros and is to be used specifically for older gearboxes. I used it on my '91 Legacy when I first got it--93K miles and a distinct crunch going into 2nd. The crunch went away around 100K and I have 172K on the gearbox now. I don't know if the better shifting is due to the Redline NS or that I compensate for the crunch by shifting slower. Either way I can't argue with success. By the way, for us Seattle people, Chris at Bow-Wow Auto Parts in Lynnwood sells Redline 75W90 (and the NS version on special order) by the case for $9.75/quart plus tax. Considering I use 4 quarts or so in the Legacy every 100K miles, that's really pretty cheap. Correction: I looked up the bill for the last case of 75W90NS I got and it was $8.95 per quart plus tax. You can call Chris at Bow-Wow at 425-771-6411. Quote Link to comment Share on other sites More sharing options...
WheaT_BeeR_MaN Posted August 10, 2006 Share Posted August 10, 2006 i use amz 75-90ns before i put that in it used to grind all the time in second and not down shift worth a crap so about $8 a quart its worth it Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 10, 2006 Share Posted August 10, 2006 I used the same Redline that Ed uses in my 4 speed, and while it did *help* it did not completely eliminate the 3rd gear and 2nd gear downshift grinding. It's not a cure all, and in the case of the 4 speed, the grinding is largely due to bad syncro design. Note that it's "bad" only in the context of subaru's in general - they routinely last 200k or more - but they shift crappy, the linkage sucks, and they almost always die somewhere between 250k and 300k (less it abused). The 5 speeds are quite the opposite - very nice shift, hardly any syncro problems till they get WAY up in the mileage (with proper maintenance), and there are a TON of them left. It's intesting to note that Subaru STILL uses the same 5 speed design with only minor changes in 20 years. The 6 speed in the STi is the first really new subaru transmission. GD Quote Link to comment Share on other sites More sharing options...
bgd73 Posted August 10, 2006 Share Posted August 10, 2006 The first hatch I owned I drained out the old stuff and then put in mobil 1 synthetic 75w90.Comes in those little gray bottles with the pointed tip.It seemed to help shifting quite a bit.I plan on doing the same thing to mine this weekend.Some may argue that sythetic is not the best choice but I love the mobil 1 stuff and use it in everything that I drive. They make alot of noise at first-- the viscosity is greatly different than regular. My old dl was changed after 15 years, and it was quite loud for 2 months , and suddenly all was quiet. I thought/felt it would go to 1 million miles with the synthetic, noticable in hot weather once viscosity synchs(sinks) in. I should do this to my loyale, but its still young at 13. Quote Link to comment Share on other sites More sharing options...
WheaT_BeeR_MaN Posted August 10, 2006 Share Posted August 10, 2006 ya it took about 2 months to see notice that im not grinding gears anymore. though i could tell right away overall. Quote Link to comment Share on other sites More sharing options...
edrach Posted August 10, 2006 Share Posted August 10, 2006 Interesting comments, GD. You'll be surprised that I have no more 4 speed gearboxes. My Brat has a 5 speed, but the synchros there are pretty shot so the Redline did not help much. Other than that, the Redline NS is only in my daily driver and the Impreza that I use mainly for rallycross and backup use. I will be installing it in my wife's Impreza as soon as I get around to it. Quote Link to comment Share on other sites More sharing options...
4x4_Welder Posted August 10, 2006 Share Posted August 10, 2006 Yeah, I probably should do something like that on my hatch. I lost first gear for a while, missed the 2-3 shift due to the sloppy linkage, jammed it into a gear, and found myself in first. Ever since then, first has been the easiest gear to go in and out of. Although, on mine, since it is RWD now, I might try a motor oil, maybe 15w40 diesel oil. Quote Link to comment Share on other sites More sharing options...
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