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Unread 05-12-2002, 08:11 AM   #1
Wolfpack97
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4.10/4.11 (Are they the same thing?)

I just received my statement from Drivetrain Direct for my 4.10 gears I ordered (haven't installed them yet). It said the Dana 30 had a 4.10 and the Dana 35 was 4.11. Is this right? Does it matter? I was wondering if I should be concerned that the 2 pinion gears are a LITTLE different. I ordered the gears as a package deal so maybe it was just a "typo" they used on the statement to describe what I bought. I plan on putting them in tomorrow if there is no problem with this set up.

Thanks everyone!!

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97 Wrangler Sport 4.0L.
3" BDS Lift, 4.11 gears, Tera Disco's, Rusty's Air tube, Rusty's adj. track bars, Class III Hitch, "Generic" Hi-Lift, 33 MT's on 8" black wheels, CB, etc. etc. etc.

03 Toyota Sequioa 4x4: Loaded with all options but basically stock. This is the family hauler.......Miss the WJ but we need more room....
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Unread 05-12-2002, 09:01 AM   #2
Bulletproofcj7
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Did you try calling drivetrain direct to sort out the problem?
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Unread 05-12-2002, 04:44 PM   #3
OldJeepguy
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Wolfpack97:
<strong>I just received my statement from Drivetrain Direct for my 4.10 gears I ordered (haven't installed them yet). It said the Dana 30 had a 4.10 and the Dana 35 was 4.11. Is this right? Does it matter? I was wondering if I should be concerned that the 2 pinion gears are a LITTLE different. I ordered the gears as a package deal so maybe it was just a "typo" they used on the statement to describe what I bought. I plan on putting them in tomorrow if there is no problem with this set up.

Thanks everyone!!</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">That's the way they all are - don't worry about it!
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Unread 05-13-2002, 02:21 PM   #4
ezgoing
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Why is it that one is 4.10 and one is 4.11? I always thought they had to be the same otherwise there would be excess stress put on the drivetrain.
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Unread 05-13-2002, 04:07 PM   #5
OldJeepguy
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by ezgoing:
<strong>Why is it that one is 4.10 and one is 4.11? I always thought they had to be the same otherwise there would be excess stress put on the drivetrain.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">The difference is negligable - Every 4 banger YJ has 4.10 in the front and 4.11 in the rear. The reason is that the ring gear diameters, being different, require a "best fit" match on the number of teeth that will fit within the diameter. Hmmm...this isn't real clear...imagine a 6" circle, suppose you want to stick 60 points around the circumference - ok fine..now you want to do the same with a 7" circle but it has to turn at the same relative speed as the 6" circle...hmmmm. What they do is determine what's called the "best fit".

I realize this explanation may be a bit cloudy but it sure is clear in my mind!

BTW - Mud bog folks run a 4.56 rear and a 4.10 front (or something similar) - not something we would want to do with out trail rigs.
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Unread 05-13-2002, 07:42 PM   #6
Wolfpack97
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Thanks everyone. I talked to my mechanic and he said this setup would be fine, no problem. He agreed that lots of vehicles run different ratio numbers in the front and rear because the "diameter" or size.

Thanks again. I am having them installed tomorrow!!!!
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97 Wrangler Sport 4.0L.
3" BDS Lift, 4.11 gears, Tera Disco's, Rusty's Air tube, Rusty's adj. track bars, Class III Hitch, "Generic" Hi-Lift, 33 MT's on 8" black wheels, CB, etc. etc. etc.

03 Toyota Sequioa 4x4: Loaded with all options but basically stock. This is the family hauler.......Miss the WJ but we need more room....
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Unread 05-14-2002, 09:28 AM   #7
blackjeep
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if you still dont understand, and if i recall right you can go to randy's ring and pinion web site and it will explain to you. I dont know the address but it will come right up if you search it.
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Unread 05-14-2002, 10:01 AM   #8
ezgoing
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I believe I understand why it is done now. Thanks.
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'92 YJ Sahara
1 1/4" shackle lift for now soon to be some sort of lift
31" Bridgestone Dueller A/Ts on AR-767 wheels
'67 Ford Galaxie 500 (passes everything but the gas station)

"What do you mean I can't make it, watch me!" = oops
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Unread 05-17-2002, 12:23 PM   #9
PA Mud Puppy
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Also, as a general rule, if the ratios are within 2% of each other, you will be ok. It won't cause any damage.
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Unread 05-18-2002, 12:18 AM   #10
kidwired
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by PA Mud Puppy:
<strong>Also, as a general rule, if the ratios are within 2% of each other, you will be ok. It won't cause any damage.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I concur, this is correct
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Unread 05-18-2002, 11:12 PM   #11
kegmaster
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i thought it was 4%, but o well. As long as you dont drive in 4w on the road it wont do anything.
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