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 Differences between 4 cyl and 6 cyl diffs?
#726922
05/25/06 06:01 PM
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Joined: May 2004
Posts: 13
OP
Need a Spot
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I have an 87 runner with the 22RE and 33x10.5's. I want to regear to 4.88 and I know that was a factory option in the later 4runners. Will the 6 cyl diffs bolt right up to my existing axles? What are the differences between the diffs?
1987 4Runner - 22RE, 290,000 miles 63" chevys, double shackle, BJ spacers, downey IFS truss, extended differential breathers, 33x10.50 BFG MT's. Soon to come - aussie locker in rear
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: extremesolo]
#726923
05/25/06 06:03 PM
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Joined: Nov 2000
Posts: 4,192
Toyota Moderator
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Yes it will bolt right in. The V6 and turbo diffs use four spider gears instead of two, larger bearings, more reinforcing ribs on the third member, and a slightly larger ring gear. The spline count and third member bolt pattern are the same, you can bolt the V6 third directly in place of your current third member.
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: DirtyHarry]
#726924
05/25/06 07:45 PM
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Joined: Sep 2005
Posts: 970
Rock Warrior
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I'd like to add onto this with a question.
I have a V6 3rd w/ 4.10s in it. Have been told that to upgrade to 4.88 with this model requires a carrier replacement and is more costly than if you started w/ another ratio, such as 4.3, 4.56 etc. Can somebody confirm/deny this and explain?
With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.
Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: RatLabGuy]
#726925
05/25/06 08:01 PM
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Joined: Nov 2000
Posts: 4,192
Toyota Moderator
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The factory 4.88 gears are the ones that use a specific carrier, not the 4.10s. So if you want to go the cheapest route, find some thirds with factory 4.88s. If you want to regear and lock your diffs you are better off just buying new ring and pinions.
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: DirtyHarry]
#726926
05/25/06 08:07 PM
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Joined: Sep 2005
Posts: 970
Rock Warrior
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Ah, that is what I thought too. I must have misunderstood what he said... point being that if you want both 4.88 and able to lock later, better to not use the V6 3rd but stay w/ 4cyl.(?)
With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.
Question Reality.
-----------------------------
'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: RatLabGuy]
#726927
05/25/06 10:33 PM
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Joined: Nov 2000
Posts: 4,192
Toyota Moderator
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You can use a normal V6 third member and add 4.88s and a locker. If you get a third member with factory 4.88s and you want to add a locker you will have to go to aftermarket gears since the factory 4.88s are thicker and use a special carrier.
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: DirtyHarry]
#726928
05/26/06 12:10 AM
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Joined: Feb 2000
Posts: 4,160
Toyota Moderator
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There is some misinformation here...
After '86, 4cyl and V6 gears were the same ("V6" style). The housings were different and the bearings were different. See the info posted by Drew Persson in the Pirate4x4.com Toyota faq.
The pinion height is what is different between the early and later style gears, and different bearings and/or spacers can be used to make them work in different housings (again, read that faq info).
The factory 4.88 carrier is the same as the normal V6 carrier, the 3rd member housing is what is different (pinion is moved closer to ring gear), and the ring gear is thinner. Any V6 locker will fit this diff, but only factory 4.88 gears will fit it. In other words, you can change the locker, but not the ratio.
Toyota doesn't use a different carrier (aka diff case) for different ratios like Dana and other diffs do. There is no "carrier split."
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: ErikB]
#726929
05/26/06 12:17 AM
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Joined: Dec 2003
Posts: 836
Rock Warrior
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There is some misinformation here...
After '86, 4cyl and V6 gears were the same ("V6" style). The housings were different and the bearings were different. See the info posted by Drew Persson in the Pirate4x4.com Toyota faq.
The pinion height is what is different between the early and later style gears, and different bearings and/or spacers can be used to make them work in different housings (again, read that faq info).
The factory 4.88 carrier is the same as the normal V6 carrier, the 3rd member housing is what is different (pinion is moved closer to ring gear), and the ring gear is thinner. Any V6 locker will fit this diff, but only factory 4.88 gears will fit it. In other words, you can change the locker, but not the ratio.
Toyota doesn't use a different carrier (aka diff case) for different ratios like Dana and other diffs do. There is no "carrier split." What he said! I just went through all of this, as this is the 3rd member that I bought. I have a regular V6 detroit in it. Mark
I would rather suffer the consequences of a Conservative?s error, than suffer the consequences of a Socialist's intent.
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: abnormaltoy]
#726930
05/26/06 01:20 AM
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Joined: Nov 2000
Posts: 4,192
Toyota Moderator
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Thanks for the clarification Erik sorry for the bad info. <img src="/forums/images/graemlins/frown.gif" alt="" />
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Re: Differences between 4 cyl and 6 cyl diffs?
[Re: ErikB]
#726931
05/26/06 06:45 AM
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Joined: Jan 2001
Posts: 1,656
Body Damage is Cool
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Just figured I'd bust everyone's chops and say that Toyota does have a Carrier Split. It's in the 8" front diff of the '03+ 4Runners, late model Taco's and Tundras. <img src="/forums/images/graemlins/lol.gif" alt="" />
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