Andy FitzGibbon Posted November 24, 2006 Share Posted November 24, 2006 I just traded for a 92 Loyale and have been having a lot of fun with it. First post here, been reading a lot of the back posts and am learning a lot. Couldn't find one about how to tell what axle gear ratio I have, though. Can anybody point me in the right direction? Thanks a lot, Andy Link to comment Share on other sites More sharing options...
86ruguy Posted November 24, 2006 Share Posted November 24, 2006 I just traded for a 92 Loyale and have been having a lot of fun with it. First post here, been reading a lot of the back posts and am learning a lot. Couldn't find one about how to tell what axle gear ratio I have, though. Can anybody point me in the right direction?Thanks a lot, Andy hey andy, welcome. is it 2wd or 4wd? if it's 4wd there should be a tag on the back of the rear diff. Link to comment Share on other sites More sharing options...
Andy FitzGibbon Posted November 24, 2006 Author Share Posted November 24, 2006 hey andy, welcome. is it 2wd or 4wd? if it's 4wd there should be a tag on the back of the rear diff. Thanks for the reply. It's 4WD. I will take a look on the diff tomorrow (it's dark now). Hope the tag is still there (WV is nominally part of the rust belt). Would like to lift the car and run some 27" tires, but not unless I can drop the gear ratio- it barely makes it up the mountains around here now... Thanks again, Andy Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 24, 2006 Share Posted November 24, 2006 3.9 for manual, 3.7 for auto. Can't change the gear ratio without replacing the transmission. GD Link to comment Share on other sites More sharing options...
Andy FitzGibbon Posted November 24, 2006 Author Share Posted November 24, 2006 3.9 for manual, 3.7 for auto. Can't change the gear ratio without replacing the transmission. GD It's a 5 speed, so I guess it's a 3.9. I saw some references to 4.1 in some other posts, but looking back at them they looked as if they pertained more towards the Legacy. Thanks again for the info, Andy Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 24, 2006 Share Posted November 24, 2006 Not that will bolt to your engine. The AWD legacy transmissions are 4.11. Just put a dual range transmission in from a late 80's GL. It will bolt straight up, and will give you another 1.59:1 reduction in low range. GD Link to comment Share on other sites More sharing options...
idosubaru Posted November 24, 2006 Share Posted November 24, 2006 like GD said you can't really change the final drive ratio anyway. you can, but it's a very big job that isn't really done. easier to just change transmissions since the front diff and trans are integrated and difficult to separate/reassemble. in a recent gear ratio discussion someone pointed out that going from a 3.7 to a 3.9 made such a small difference in the overall ratio that it's a very insignificant part of the gearing. so i'd imagine the same would be true in going from a 3.9 to a 4.11 as well. best to look at overall gearing i guess, there are other EA transmissions that may have better overall gearing, like the dual range GD mentioned. Link to comment Share on other sites More sharing options...
Andy FitzGibbon Posted November 25, 2006 Author Share Posted November 25, 2006 Cool, that's all good info. Thanks. I did more searching, didn't realize the 5 speed trans has two overdriven gears. Then it occured to me that going from 23" stock tires to 27" would be about a 500 RPM drop, about the same as shifting from 5th to 4th gear. (I'm sure lots of other people have already figured this out ). Thanks again for all the help. Best, Andy Link to comment Share on other sites More sharing options...
mikeshoup Posted November 25, 2006 Share Posted November 25, 2006 Its not just a linear 500RPM drop... its a ratio. 23/27 = 0.85 That means, you're final drive ratio is actually around 85% of what it originally was. So if you're vehicle has 3.9 gearing, this increase in tire size effectively makes the gearing: 3.32 If you were driving at 6000RPM, you're actually driving at 5111RPM for the same speed. The joys of math :-p Link to comment Share on other sites More sharing options...
daeron Posted November 25, 2006 Share Posted November 25, 2006 Cool, that's all good info. Thanks. I did more searching, stop. :-p The search function is a handy tool. Another handy tool (that was just pointed out to ignorant Me..) is the "similar threads" feature at the bottom of the screen. check those out, too. Welcome aboard, this soob is a wonderfully simple little beast to wrench on, it turns on a dime, and its just a hair over a ton!! cant ask for too much more. Link to comment Share on other sites More sharing options...
Andy FitzGibbon Posted November 25, 2006 Author Share Posted November 25, 2006 Its not just a linear 500RPM drop... its a ratio. 23/27 = 0.85 That means, you're final drive ratio is actually around 85% of what it originally was. So if you're vehicle has 3.9 gearing, this increase in tire size effectively makes the gearing: 3.32 If you were driving at 6000RPM, you're actually driving at 5111RPM for the same speed. The joys of math :-p Right you are- but I'll probably never be driving at 6000 RPM. 70 MPH in 5th with stock tires is about 3111 RPM, with 27" tires it would be about 2650 RPM. Put the 27s on and shift to 4th, I'd be running about 3295 RPM. If I wanted to get closer to stock engine speed 28s might be a better choice. This is assuming the tires are actually that diameter, and as we all know they never are. Thanks everyone for setting me straight on this- my last four vehicles have been 84-89 Toyota trucks and 4Runners and it's taking me a while to adjust my brain to the Subaru drive train Andy Link to comment Share on other sites More sharing options...
idosubaru Posted November 25, 2006 Share Posted November 25, 2006 and 4Runners oh yeah? when is my best friends 4 runner going to finally break something? 1997 SR5 with 250,000 miles and the ONLY thing he's done to it is a new power steering pump. he hasn't even done the timing belt! i need to plug around some 4 runner information and try to do that timing belt for him. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 25, 2006 Share Posted November 25, 2006 Right you are- but I'll probably never be driving at 6000 RPM. Andy You may not be cruising at 6k, but when you merge on the freeway with 27" tires you WILL rev to 6k before you shift or you'll be crushed by a semi. 6k won't hurt it - the SPFI block's have a 6.5k redline, and all mine will easily rev past 7. GD Link to comment Share on other sites More sharing options...
crazy D Posted November 26, 2006 Share Posted November 26, 2006 hey i kno this kinda sounds like a dumb question to ask.....but im a ********************* so im gonna ask it anyway:grin: ....ive always wondered if u had a 3.9 ratio in the front and lets say u put a 4.111 in the the rear diff.... if u had tires that were larger in the back to balance out the different ratios could u match those so that ur rear diff didnt blow the hell up? and actually fuction like normal?......ha, that was a dumb question:banana: Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 26, 2006 Share Posted November 26, 2006 Yeah - you could do that. I thought of it years ago, and just recently a member worked up a table of sizes and rear diff ratio's. But it wouldn't buy you much of anything unless you off-road in reverse. Help the departure angle a bit maybe but that's about it. Clearance in the rear is already more than in the front. GD Link to comment Share on other sites More sharing options...
Andy FitzGibbon Posted November 26, 2006 Author Share Posted November 26, 2006 I did the timing belt in my last 4Runner, it wasn't too big a job. The hardest part was that Toyota gave me the wrong front main seal- it was fun to start it after putting it all back together and have all the oil dump out on the ground. Arrgh. So I really did the timing belt twice, I guess. The other fun was that someone sheared the crank pulley key and replaced it with a bead of MIG weld on the crank! It was working OK, so I left it alone. Back to topic- my Loyale I've been talking about is sort of marginal rust-wise. Just found out a friend has an 85 D/R wagon for sale, so I'm gonna check that one out for modding. Thanks again for all the replies, Andy Link to comment Share on other sites More sharing options...
86ruguy Posted November 26, 2006 Share Posted November 26, 2006 "23/27 = 0.85 That means, you're final drive ratio is actually around 85% of what it originally was. So if you're vehicle has 3.9 gearing, this increase in tire size effectively makes the gearing: 3.32" so, this effectively states that if i have a 3.7 final ratio, and go from 23's to 25's, (=.92%) i go to a 3.4. no wonder i got no launch anymore:mad: Link to comment Share on other sites More sharing options...
crazy D Posted November 27, 2006 Share Posted November 27, 2006 Yeah - you could do that. I thought of it years ago, and just recently a member worked up a table of sizes and rear diff ratio's. But it wouldn't buy you much of anything unless you off-road in reverse. Help the departure angle a bit maybe but that's about it. Clearance in the rear is already more than in the front. GD so u could do it just to do it tho rite?....i mean if im out wheelin its gonna be the same ratios as stock ratios.....with just the larger tires. rite? thnx -D Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 27, 2006 Share Posted November 27, 2006 so u could do it just to do it tho rite?....i mean if im out wheelin its gonna be the same ratios as stock ratios.....with just the larger tires. rite? thnx -D Sure - slap an 4.11 (or 4.44) R160 from a leganus up there, and get some bigger tires to counteract the difference in ratio's. Nothing at all stopping your from doing it - I just don't see a whole lot of practical use for it, except for a dune buggy type of use where you want big paddles in the back, and small straight grooves for steering in the front.... GD Link to comment Share on other sites More sharing options...
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