WY 4.11 Posi unit. 1968 12 bolt. $300 shipped.

[sharpie1972]

4.11 posi unit from a 1968 12 bolt. Will bolt right in to any 67-72 12 bolt housing. Includes center section, ring and pinion, plus any stock install shims. Gears are tight, fluid was nice and clean. $300 shipped in the lower 48.
Please reply in thread, Thanks, Sharpie

[Patsfan34]

Dennis you are the man!!!

[DPowers]

Man you are killing me- have a bare 4 link rear end that it would bolt right in.......

[sharpie1972]

Posi's don't come much cheaper to your door! Sharpie

[novafrog]

interested,pm sent

[novafrog]

any one no if 373 gears will work with this,thanks

[sharpie1972]

The information I'm finding in the drivetrain area says this is a series 4 carrier and will accept 3.73-4.11 gears. Let see if any of our experts can confirm! Thanks, Sharpie

[AusTx68]

I'm all over this! Consider it sold if no one beat me to it!

[sharpie1972]

Ok, let's give Novafrog some time to confirm if 3.73 gears will bolt to the carrier. You are next in line. Thanks, Sharpie

[novafrog]

i will take it,pm payment info.,if they will work,thanks

[AusTx68]

Here's what I found at hotrod.com
Based on this info it probably can't use a 3:73. That has me thinking..my 383 with 4:11s and 700r4 might be too much for my application. Sorry for jumping up without doing all my homework. I will give up my place in line to the next buyer.

ip 15: When shopping for 12-bolt differential parts at a swap meet, keep this in mind: Chevrolet generally used three different types of differentials for the 12-bolt: the Two Series carrier, the Three Series carrier, and the Four Series carrier. The "Two Series" has little use in a hi-po application and should be avoided if at all possible. The Three Series carrier accepted ring and pinions that ranged from 3.08:1 to 3.73:1, while the Four Series carrier accepted ring and pinions ranging from 3.90:1 to 6.14:1. While there are a number of subtle variations between the three types of carriers, a major difference is the thickness of the gear flange. Two Series carriers are the thinnest, while Three Series flanges are thinner than Four Series flanges. Because of the size of the flange, the carriers cannot be randomly used with ring and pinion sets from the trio of "families" (unless, of course, special gears with custom ring gear mounting surfaces are used. These special gears are readily available from Richmond Gear). Additionally, the Two Series carriers do not have any webs on the top of the carrier. Three and Four Series carriers do have webs.

[sharpie1972]

Is that car or truck info. I believe there are variations between the two. Any input from other members would be appreciated. I don't want Novafrog to buy parts he can't use. Thanks, Sharpie

[AusTx68]

Looks like they are referring to 12 bolts in general. Here is the full article(see tip 15): http://www.hotrod.com/techarticles/c...all/index.html

[AusTx68]

I would like to add...they do make aftermarket 3:73 gears for the 4 series carriers so Novafrog should have no worries.

I'll leave now..I've caused enough confusion!

[novafrog]

[QUOTE=AusTx68;4183875]I would like to add...they do make aftermarket 3:73 gears for the 4 series carriers so Novafrog should have no worries.

I'll leave now..I've caused enough confusion![/QUO my gears are gm,so i'am still lost,going to bed,good night

[w314speed]

Unlike the GM Car Posi Carriers, which were 3 series carriers to 3 series gears and 4 series carriers to 4 series gears! I believe the 68-72 Chev Truck posi carrier was for 3:73 and 4:11. The GM parts book sheds some light in gp#5.511 for the posi clutch discs 65-68 c-10 w/ 3:73 exc 4x4, 69 c-10 w/3:07 and 70-72 c-10 and blazer w/3:07,3:73 and 4:11. I think you are good to GO......................Stay away from aftermarket gears, they tend to be hard to setup and noisy.

[sharpie1972]

Thanks w314! This matches the info. I found. I hate to make guarantees I can't back up. Novafrog may want to "hop" back in after hearing this. Sharpie

[novafrog]

yes i will thak it,money on its way,thanks for all the info.

[DPowers]

Originally Posted by novafrog

yes i will thak it,money on its way,thanks for all the info.

Thanks for buying it so I DIDN'T HAVE TOO....

Good Deal

[70BLAZERX2]

Bill that 12 bolt 4x4 posi and gears will go right in your 71-72 housing..yes..a bolt in..As long as you use all the shims and spacers from the old housing.(to keep the same pattern) Done it alot..

12 bolt rear..up to 79 truck and chevyvans had them also. same thing as long as it is a 12 bolt "truck" rear

Carrier 's fits 3.42 and down , and 3.73 and up..The 3.42 were in later trucks..only thing you could get in 67-72 was the following

3.73 was standard ratio...no option on glovbox door label.
3.08 was an option..showed on label
4.10 was an option showed on label

Posi was on label as option too. Man i need my red book..I cant find it..

[billsbowtie]

sharpie i have a ? i thought i would ask it here because others may have the same one.
will any pois unit out of 67/72 12 bolt 4wd or 2wd fit and work in the 71/72 stock 5 lug 12 bolt rear end without any trouble? thanks in advance for any help.

[sharpie1972]

Hi Bill, that is my understanding. The only issue seems to be what gears the posi unit will accept. Maybe someone who is very knowledgeable in rear end rebuilds can confirm. Sharpie