I know Ford had a N case center section. Did GM ever make a N case rear? The reason i ask is i pulled the rearend out of my Stage 1 . The rear as far as i know is out of Pontiac and it has a N on the center section.
Ford makes the best rears and 4 spds . GM had weak rears . I have had 1200 HP in front of a 9inch N-case 40spline and spool .
Best rears are by Ford????? Hmmmm, actually most efficient rear is the 12 bolt Chevy. Less power lost due to gear design and friction. I don't know of any GM rear with "N" cast on them. Common practice is "N" stands for Nodular iron.
George efficent is great until it ends up in pieces NASCAR and most top fuel and ProStock classes use the 9" or a variation of it made by aftermarket . I just know form years of racing and building high performance engines that if you want it to live go 9". I know of a Buick GN that runs very fast that went to the ford rear also. The toploader is many times stronger than the Munchie or Borg Warner . It is also heavier by 35lbs or so . I have never seen a Buick with a toploader but several Chevies have changed around here .
Thats why i asked i had never heard of a nodular GM rear. I did some searching and found some aftermarket GM type rears with the nodular center. Pat Harmon stoped by yesterday and i showed it to him so i know i'm not seeing things. I was just curious as to if thats what it stands for or if its something else.
Yes I did see the "N" Kevin is speaking of....It looks an awful lot like the "N" that is on the center section of a 9 inch rear...As for the strength of a 9 inch vs 12 bolt,a good friend of Dustin and mine races high HP Nova's and I seen what his 1/4 looks like after it spit the axle out the side.C clips are a bitch to deal with and the leaky alternatives aren't the best.I'll take a 9 inch anyday over a 12 bolt. Pat
I didnt find any # on the pass.side tube. But on the drivers side i found the #260that was stamped upside down. then next to it right side up were the letters XK.
That's a nodular iron center section. Kevin, What you have is a rearend out of a ram air Pontiac GTO. The center section is nodular iron and is stronger than a standard 10 bolt. How much stronger I don't know. This was discussed in another thread that I had started but it seems to have disappeared. I have one of these laying in my back yard. There should be a part number stamped on the case that will identify the year. Hope this helps.
Nodular hsg 8.2 rears were specified for some '67-70 Pontiac 8.2 10 bolt rears, & were used up into '71 production in '71 400 4spd Pontiac A-bodys with HD Safe-Track & 3.55 gearing. All 3.55 & lower (3.90,4.33) gear ratio cars from this era equipped with RamAir had the N housing, but many more were used in not so exotic drivetrain cars... For example, base engine '67-70 GTO's with 3.55 HD Safe-T-Track often got the N housing, so did manual trans '68-69 Firebirds with Sprint 6 & 3.55 gearing & HD Safe-T-Track. :3gears: Roger
Had to dig this issue back out.... I found a 66 Pontiac 8.2" rear in a 66 Cutlass Supreme 4 door (has bolt on spring purches). It has the large "N" cast on the center section above the pinion yoke. It has a 2 pinion anti-spin carrier though with factory 3.08 ratio. Olds code "SD" is on the tube... I am certain this rear has never been fooled with. Is this the housing you are talking about? I cannot find any good answer for this other than the 66 W-30 used this housing and the 4 pinion carrier also....
the 10 bolt posi i just got has a N cast into it believe driver side by yoke just like that trying to id mine i like the idea of nodular better stonger
Kevin. My Hollander manual lists XK as the code used for Pontiac Tempest/GTO 1969-72. 3.90:1 ratio locking axle. Hollander has no explanation for the cast "N". Jim J.
YES - GM Pontiac cases were nodular for 66-70 after that ALL GM housing and most rear were ALL NF nodular forged castings just standard practice. The Pontiac rears with the Nodular cast centers also received the harden axle shafts too. Pontiac 10 bolt 8.2 had the largest and widest bearing caps of all 10 bolt and 12 bolt rears. Pretty stout little 10 bolt for the day. Plus a 4 pinion posi on the street and some track time it was pretty darn good rear. The trouble back in the 60-70 was the metal mix was not as good as stuff is now... Now less metal will do the same job. FROD 9" info - I am sure you are not using STOCK 9" parts in your race car 1200HP ...lol. I KNOW NASCAR is NOT... that 9" they are using is anything BUT STOCK.... they have oil coolers and larger pinion shafts and aftermarket pinion supports, totally different aftermarket cases...THIS IS NOT SOMETHING YOU WILL FIND UNDER ANY FACTORY INSTALLED frod....lol. YOU ARE NOT COMPARING APPLES TO APPLES ETC. On the other hand NOTHING was ever needed to modify 12 bolt chevy and Dana 60 from holding up to the power run though these rears. NO after market mods were needed to deal with the rear breaking done for street application - THEY WERE BUILT TO DEAL WITH BIG BLOCK POWER PERIOD. EVEN 8 3/4 MOPAR IS BETTER THAN STOCK FROD 9" - I love when guyS put in 35 spline axles into a STOCK CENTER NOD HOUSING Frod 9" when the actual pinion shaft is almost 1/2 the size of the axle shaft...lol. what do you think is going to break... The pinion shaft is 1.313" the 7.5 shaft is 1.438 ...??? reason for FRODS popular use is the drop out (GEAR SWAPPING EASE) and supply of parts (TONS )- IT would be the same reason SMALL BLOCK chevy is in every street rod, pontiac, olds, buick and even FORD CARS - ease of power plenty of parts etc. IT DOES NOT MEAN IT IS THE STRONGEST BEST MOTOR EVER BUILT...IT IS JUST POPULAR - AS for strength - MOST any mechanical part will survive best when it is assembled correctly - THAT will go the furthest in keeping any engine, trans or rear end together under extreme conditions SO choose your weapons and go play you WEEK END WARRIORS! Will make more. JIm :beer JD
Ask Mike Evans about his 12 bolt. I must add that the quality of the set up make a difference no matter what you run.
Definetely NOT FORGED as it would be formed by presses or hammering etc. standard cast has a weaker mix of metal that has less strength that nodular castings which have a better bonding metallurgy - it is the grain nodular having nodules or spherical components of metal compared to shavings or flakes of metal weaker ... and type of alloys mixed to make the slur. Again there are many NODULAR mixes of castings... Wish we had a list of all the different castings and ferrous metals they mixed into the castings. WE do not at this time. I will keep searching for more info. Jim
