FxRacing282 Posted May 8, 2009 Share Posted May 8, 2009 yeah my dad is sick of looking at it. i have no use for it. but the price is right. only weight about 50 pounds shipping wouldnt be too much. atleast, thats what it feels like? Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted May 8, 2009 Author Share Posted May 8, 2009 After all the discussion I think it better to stick with the AX4 or find an AX5. I was considering a car 5 speed because my 'manche is a 2.5 4x2 and is totally street used. I am on the highway at 55 to 75 quite a bit, and I thought it would maybe make my final gear slightly taller but not too tall. Currently with my AX4 if I shift at 3000 rpm I shift into 2nd at 20mph, 3rd at 35mph, 4th at 55mph. At 70 my tach reads 2750rpm. Is an AX5 an AX4 with an added gear? If so, can anyone tell me what my RPM's would be in 5th at 70mph? Link to comment Share on other sites More sharing options...
FxRacing282 Posted May 8, 2009 Share Posted May 8, 2009 yes it is. tire size and gear ratio is a factor or rpm. the t5 60 degree heads tranny the fifth gear is like .72 i believe. somewhere in there. Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted May 8, 2009 Author Share Posted May 8, 2009 yes it is. tire size and gear ratio is a factor or rpm. the t5 60 degree heads tranny the fifth gear is like .72 i believe. somewhere in there. If 4th in both the AX4 and AX5 is 1:1, this would mean a 28% drop, so instead of 2750 I would be around 2100. "Geonovast" said the AX5 5th gear is .86, so this would mean a 15% drop, and 5th rpms of about 2350 (like this better). I will do some experimenting on acceleration from these rpms as compared to from 2750 to see if I want to look at an AX5. Thanks, everyone, for helping me make up my mind! :cheers: Link to comment Share on other sites More sharing options...
jaekl Posted May 8, 2009 Share Posted May 8, 2009 I've seen it many times here. 4 spd and 5 spd have different rearend ratios. My stock 86 4cyl 5 spd is 2300 to 2500 at 55. My 4 spd without a tach doesn't sound to have excess rpm. Your 2750 at 70 sound extremely low for either box. Link to comment Share on other sites More sharing options...
Pete M Posted May 8, 2009 Share Posted May 8, 2009 The 2.5L + 4spd manual trucks generally got stuck with the way-too-high-for-a-4banger 3.55 gearing. 4.10s are the way to go with stockish sized tires. :thumbsup: Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted May 9, 2009 Author Share Posted May 9, 2009 The 2.5L + 4spd manual trucks generally got stuck with the way-too-high-for-a-4banger 3.55 gearing. 4.10s are the way to go with stockish sized tires. :thumbsup: If 4 wheeling is what you do, I would say my gearing would be way wrong. But for highway I think 4:10 would send my engine to over 3000 at 70. Back in the late 1960's, early 70's we all wanted 4:11 posi for our hot rods, but we were mostly driving in town and when we could, drag racing. I had a 55 chevy with 525hp 327 balanced and blueprinted with a Pontiac GTO close ratio 4 speed and 4:56 posi, and at 55 in 4th I was doing some high revs. Of course, my redline was 9000 on my 10,000 Sun Tach! Right now my engine really seems to "like" the 2750 at 70, about 2900 at 75. If I need to accelerate to move into the passing lane, it does well at those rpms. I think the slightly more than stock cam from Delta and the Clifford header and flowmaster single in/dual out helps. Link to comment Share on other sites More sharing options...
Pete M Posted May 9, 2009 Share Posted May 9, 2009 4.10/2.5L trucks came with the 5spd AX-5 which gave you overdrive for the freeway and 4.10s for the stoplights. :thumbsup: Best of both worlds. Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted May 9, 2009 Author Share Posted May 9, 2009 4.10/2.5L trucks came with the 5spd AX-5 which gave you overdrive for the freeway and 4.10s for the stoplights. :thumbsup: Best of both worlds. Best of both worlds! I like it! But, I gotta find 4:10's and my differential is right now doing fine2 Guess I shall stick with the AX4! :roll: Link to comment Share on other sites More sharing options...
Pete M Posted May 10, 2009 Share Posted May 10, 2009 Personally I don't wait for the Dana 35 to give me trouble. I've replaced every one of them thus far (except for the empty MJ in GA, and I already have a replacement for that one, it's just up here in MI). I learned my lesson after the first one blew up. :fs1: Go with an Explorer 8.8 and never look back. :D Keep in mind that running over 3 grand on the freeway isn't harmful to a Jeep inline engine. :thumbsup: Link to comment Share on other sites More sharing options...
Geonovast Posted May 10, 2009 Share Posted May 10, 2009 I have 3.55 gearing in my 2.5 and I'd swapped in an AX-5. I really only use 5th on the interstate, I can occasionally get away with it at 65, but on on flat roads. If there's any hills, I don't use 5th whatsoever. Remember, lower RPMs does NOT mean better mileage, if the engine has trouble turning the gear, it can actually make it worse. Also, I've sat around 3400 RPM for 4-5 hours pretty much straight with my 2.5 and it doesn't hurt anything. It may sound like it's about to explode, but it's fine. Another thing to consider is my 2.5 is a 91, therefore I have the MPFI. IIRC, the MPFI 2.5s are pushing 15-20 HP over a TBI 2.5. She's also sitting on 205/75 R15 tires, which I believe are the smallest from factory. Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted May 10, 2009 Author Share Posted May 10, 2009 I'm honestly not sure of my differential gearing, but my MJ being the basic 4x2 swb on stock tires, and my tbi engine having a mild cam, clifford header, and single in dual out flowmaster, and only 40,000 old after overhaul, I think my 119 hp engine stock is pushing 130hp now. At 2750 rpm at 70mph or 2900 at 75, hills etc are not a problem. There is one I sometimes take on I-70 here in Missouri that slows loaded semi's down to sometimes 30-40 mph, and I can slowly accelerate in my AX4 4th gear if I really want to. That is why I was thinking a 5th gear may help when I am on mostly flat interstate. A downshift to 4th now and then may be necessary, but ... Link to comment Share on other sites More sharing options...
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