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Dude, for $250 I'd snatch that up. It's local, it's cheap, you'll have 2 spare axle shafts, and like I said earlier, you CAN use that in conjunction with the 3.91 in a pinch. Get that to have on hot standby so you know you can make the next trip, and keep searching for a 3.91 rear as well as expand your searches for a 4.10 front (I recall seeing a few in my earlier searching).ok after talking to the guy and getting the axel code its 4.10 gears darn!!!!!!! he did say he would take $250 but that wont do me any good with 3.91 up front ill keep looking
Dude, for $250 I'd snatch that up. It's local, it's cheap, you'll have 2 spare axle shafts, and like I said earlier, you CAN use that in conjunction with the 3.91 in a pinch. Get that to have on hot standby so you know you can make the next trip, and keep searching for a 3.91 rear as well as expand your searches for a 4.10 front (I recall seeing a few in my earlier searching).
Oh yeah, I forgot about that. That is a problem. Also, to somewhat counter what I said about running them together, it actually would be bad to run the "faster" gears in the front anyway so 86 that idea. 3.91 rear with a 4.10 front would be passable, but not the other way around.~ I don't have 2 low![]()

Since its out, maybe have him measure the ring gear diameter to be sure. I didn't research it yet, but since the T100 was Toyota's first venture towards a full-size truck, I doubt it'd have a 7.5" diff in the back - even if it is a 2wd. That's the same diff my dad's 95 2wd has with a 22RE as well as what's in the front on IFS trucks. Maybe also ask if he knows what motor was upstream of it to eliminate more variables.
I don't quite understand what the pinion letter designation is referring to. 2 or 4 what? That certainly cannot mean number of teeth so I'm confused.
And no, there's no way a 7.5" ring gear would mount to an 8.4" carrier. I've never seen either of them but I'd bet big money that's a true statement.
Definitely do some more research Zack. See if he can send you pics of everything he's claiming: Axle code, tooth counts, and ring diameter if possible. One more thing to hit up Google for: See if the ring gears have different numbers of mounting holes between the two sizes. IE - E-locker rears have LESS ring gear bolts than an open 8.4" diff does. That'd be a dead giveaway if they are different.
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T100 is still a hybrid mid-size truck and likely used parts from the older assemblies too, so a 5-lug axle with a 7.5" diff under there is totally feasible.I talked to east coast gear supply today he said the 2wd 5 lug trucks had 7.5" ring but the seller says he has 6 lug...
A t100 should not have 5 lug bc like u said its full size truck
The pinion numer tells if u have 2 or 4 spider gears i think..Mine is a 2 pinion or spider gear
Also my self and the seller dont see how a 7.5 will fit in a 8.4 but it is smaller so ya never know..
The seller will refund money if the part is wrong upon return of diff..
E.C.G.S. quoted me $670 to rebuild my diff with all new gears bearings etc. and install solid pinion spacer and my locker... also shipping and a 5 year warrenty are included...
And no, there's no way a 7.5" ring gear would mount to an 8.4" carrier. I've never seen either of them but I'd bet big money that's a true statement.
Also my self and the seller dont see how a 7.5 will fit in a 8.4 but it is smaller so ya never know..
Sorry buddy but it's pretty safe to say that a 7.5 WILL NOT WORK for your application. don't waste your time, move on.
sounds like Windrock is where we're going to be for this ride. Kinda have mixed feeling on this but at least we can start planing out the trip and the small tire guys will have ample room to ride around - That is if they show up.
2 full days of riding, get your votes in now. Waldens Ridge anyone?
Yea I have asked him to send me a pic of him measuring the ring and to make it where I can read it he's gonna do that today and if it's a 8" I'm gonna buy it
you need 8.4" and nothing else, 7.5" is 2WD and front of 4WD IFS trucks, 8" is for mini trucks axles and 8.4 is tacoma (plus others I'm sure). If you get an 8" you're once again wasting time and money.
From my under standing after much research the 8.4 is still a 8" ring the only difference is larger bearings I use to see it ur way but after much research I see its a 8" and again I may have bad info ?!?!????
$200 for a 4.10 front plus $250 for a 4.10 rear WITH extra spare parts = $450. That's $200 less than from ECGS, and yes, it's more work and more time, but it's lower gears, extra parts, less money, AND maybe you can then sell YOUR 3.91 front for another $100-$200 back in your pocket. That's how I'd do it, but that's just me."if it's a 8" I'm gonna buy it other wise I'm gonna dip in the wallet and pay ecgs to rebuild mine."
"Yea I saw a few front diffs for 200 that had 4.10 ~~~"
"ok after talking to the guy and getting the axel code its 4.10 gears darn!!!!!!! he did say he would take $250 ~~~"
75 will always be on my list to shoot for when at Windrock. As long as it isn't wet, snowy or icy, I'd be okay with running it. Probably going to be another level of cold though being up on that ridge with the likelihood of strong winds.If all goes well ill love to hit 75lol even tho ur pix of it looked crazy :0

I do trust u over these other dumb ppl on the World Wide Web. Lol sometimes research can confuse more than help... That's y I say pay ecgs and wash my hands and if it breaks again ship it off oh and they do all work and ship it back in 48 hr...... I quoted myself lol sorry meant to quote u and I see the app u can edit now sorry lol I'm going crazy hehe

I'm going to agree with Ted here. I have to say that they wouldn't list it as an 8.4" diff if that ".4" wasn't important. I believe that this measurement actually IS the ring gear diameter. Therefore, as Ted said, an 8" diff/R&P shouldn't fit. Since you're already discussing options with them, I'd just hit up ECGS and get their opinion.From my under standing after much research the 8.4 is still a 8" ring the only difference is larger bearings I use to see it ur way but after much research I see its a 8" and again I may have bad info ?!?!????

Ted, I've got mixed thoughts about Zack's truck up there. What do you think? The lack of a front locker is less concern to me than the long rear overhang and the power steering issues.![]()