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Old 11-12-2005, 04:28 AM   #1 (permalink)
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4.77s + 4.88s

Is the difference between a 4.77 gear set and a 4.88 gear set to much for you to be able to run together (4.77 rear axle, 4.88 front axle)? I'm guessing it probably is, but I just want to check. Trail only rig, mostly rock

BTW, I understand there is a chance of getting away with it if I were to play with the tire pressures some, but that seems like a real PITA

Last edited by LostIt; 11-12-2005 at 04:28 AM.
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Old 11-12-2005, 08:30 AM   #2 (permalink)
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I just regeared to a similar set-up. 4.77 fr, 4.88 R. So far so good. I've run them on one trail weekend, and they did well. I played with the tire pressure to acheive a 0.35" difference in tire radius. I ran in 4low for miles and never noticed any pulling or binding. I did get some excessive heat from the front diff, but I think that is the product of bad bearings. It does take some extra attention, but wheeling on the east coast, we don't get many high traction situations. If it was terrain like Moab, I'd be alittle more wary.
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Old 11-12-2005, 08:34 AM   #3 (permalink)
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The standard is normally a 1% difference is ok. The difference in those ratios is about 2.3%. It will probably be ok, but you're pushing the limit.
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Old 11-12-2005, 09:10 AM   #4 (permalink)
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yeah, I did the math a few days ago and thought it would be to much. Most of the places around here I think I could get away with, but I'm pretty sure the granite in mason would not be kind.
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Old 11-13-2005, 10:40 AM   #5 (permalink)
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most people don't pay an anal retentive amount of attention to air pressure in there tires and I'm sure often get a difference front to rear similier to what you have going on, hell if you run tires from interco and don't pay attention you could get an even bigger difference. Also several toyota guys on this website (including gearman who runs a very reputable gear shop) run 5.38 front 5.29 rear succesfully.

Worst case scenerio go out and air your tires down to a pressure you would likely run then play with it a little to get a 2-2.5% difference in the loaded radius front to rear. Remember this number and it won't be a pain in the ass.
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Old 11-13-2005, 02:11 PM   #6 (permalink)
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my friend has a k5 and he has 4.56 front and 4.10s rear, iknow thats a huge differance and if he drives it on anything hard itll blow, but would it brake anything in mud? i know thats a stupid question but what do you guys think?
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Old 11-22-2005, 12:25 PM   #7 (permalink)
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i ran 410's in the front and 3.73's in the back of a tj on 33's and it is was fine for OFFROAD ONLY. as long as there is some alowed tire slippage you should be fine. engaging and disengaging was a little hairy but that is to be expected.
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Old 11-22-2005, 12:29 PM   #8 (permalink)
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what is the point of running 2 different gear ratios? i dont see the point in it other then blowing the diff. apart. someone please explain why someone would want to run this setup.
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Old 11-22-2005, 12:42 PM   #9 (permalink)
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Quote:
Originally Posted by NetBSD
what is the point of running 2 different gear ratios? i dont see the point in it other then blowing the diff. apart. someone please explain why someone would want to run this setup.

means to an end my friend.

i did the front with 410s and ran it while i was waiting to get my 8.8 installed that was already geared.

i olny ran that way for a couple months and only two trips in 4wd
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Old 11-22-2005, 05:10 PM   #10 (permalink)
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what is the point of running 2 different gear ratios? i dont see the point in it other then blowing the diff. apart. someone please explain why someone would want to run this setup.
It depends on what axles you are running from different manufacturers. The best situation is to have matching ratios front and rear. But not all manufacturers have all gear ratios. If you are running axles from different manufacturers guys are trying to get as close as they can. For Yota guys, Yota makes a 5.29, the closest comparable Dana is a 5:38. Not ideal but can be made to work.
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Old 11-22-2005, 05:13 PM   #11 (permalink)
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i guess, i still wouldnt run diff ratios, id swap axels so they matched but thats just me. thanks for the info tho
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