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#1 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
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gear change out info wanted
I have been contiplating replacing the 342's in my 12 bolt, and have seen that jegs has a ring and pinion 411 posi set for sale for 495.00...
I have never done this and don't plan on doing it myself, but can someone tell me if I purchase these gears can they be put into any twelve bolt, or is there much more to it. do I order them specifically for my rear-end or are they all the same?? Thanks for your knowledge. TS |
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#2 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: gear change out info wanted
You'll have to make sure they are for a truck 12-bolt. Car and truck diffs are different.
What are you gonna do with the 3.42's? Sell? Keep? I may be interested. ![]()
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#3 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: gear change out info wanted
Heres a TTT for you. Someone can answer your question, but you might need a different carrier. John
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#4 |
Lovin' Arizona Since 1961
Join Date: Jul 2004
Location: Camp Verde, Arizona
Posts: 173
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Re: gear change out info wanted
My '70 shortie has a 12 bolt posi with 4.11 (coil springs) and I was thinking of going up in gears to get some hiway speed. LOT easier to swap entire diff's...... I'm in Northern AZ. H.
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"Religion is like a toothbrush: Everybody should have one, but I don't want yours" - Will Rogers |
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#5 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Re: gear change out info wanted
As long as you get the Posi carrier that goes with those gears you will be OK. Your center carrier will not take 4.11's.
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![]() ![]() 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI |
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#6 | |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Re: gear change out info wanted
Quote:
I am curious why you want a 4.11 gear. Assuming you are running a T350 transmission, and a 28" tall tire you should consider a 3.73. That gives you good low end torque and still allows a moderate rpm at highway speeds.
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