Bullet proof GM 12 bolt.

[Captainfab]

The TBSS ' have 9.5 SF 14 bolts under them?

I would go with either a Dana 60 or the 9.5 SF 14 bolt, and have it shortened to your needs. The Dana 60's are very common under F250's and the 9.5 SF 14 bolts starting in mid 80's GM C20,K20 and the 2500's from '88 and up.

Originally Posted by 68GMCCustom

I too am wondering about rear ends..............truck rears that is.
Can't argue with the toughness of a 9"...also can't put a blue oval part on my GM truck.

Currently have a rebuilt truck 12 bolt with new Eaton posi, 3.73 gears, and "bearing saver" bearings. Running street 275/60-15 BFG's on 8" wheel, but I want to go to a wider 29"-30" tire, preferably MT ET Street drag radials and 4.11 or maybe 4.56 gears. Have a line lock, but its not currently installed. My 6.0L LY6 should be making over 500hp at the crank and is running thru a "built?" 200-4r, and I may add some spray....or preferably a Vortech supercharger later.


That said.......what is the "better GM" choice for a rear end tuff 'enuff to get beat on at the track by a 500+hp motor and sticky tires, yet still be up for street duty for weekends, cruises, long tours, etc. I know I'll also have to do a bit more for my 200-4r (or replace it) for it to live long. As for a rear diff.....I've always thought I'd choose a Dana 60......but the 9.5" 14 bolt semi-floater in our TBSS has me thinking about one of those.

[thirdstreettito]

I'd go with a Dana 60 to be safe. It's easy to find cheap and it will add weight to the rear to help with hooking.

[68GMCCustom]

Yes, 9.5" 14 bolt. And its holding up to what guys are throwing at it....taking the stock LS2 to bigger cubes and boosting with forced induction or N2O. The 4L70E "Super Duty" trans has been the weakest link. Our TBSS had nothing but a tune....and is on its 2nd trans so to speak as they rebuilt the original at around 25k mi.? The tunes been out now for a while, and won't go back in until I'm ready to start upgrading parts...which will be within the next 12 mths or so. Its out of warranty this month...and paid off in 12. Then the wife gets something new...and I get the TBSS to add to my "collection of 2"...a '68 and an '06...though I'm working to get my dads old white w/red leather '84 Caddy Fleetwood Brougham to add also. Then I'll have 3 and it will be time to move to a home with more garage/land around it!


***BTW - this also makes TBSS's prime candidates to purchase a salvage truck for the complete LS2/4L70e/9.5" 14bolt drivetrain. Actually, I think the complete chassis is used on the AD series (47-54/55?) trucks/SUVs.

[Captainfab]

That's interesting. I had no idea that GM put the 9.5" 14 bolt under anything but trucks. I see that they put them under the 6 speed SSR's as well. It's too bad they changed the wheel bolt pattern to 6 x 5", but that would be easy enough to change to 6 x 5.5" if a guy wanted. Do you have any idea on the width of these in the TBSS application?

[dgreen]

Originally Posted by Captainfab

That's interesting. I had no idea that GM put the 9.5" 14 bolt under anything but trucks. I see that they put them under the 6 speed SSR's as well. It's too bad they changed the wheel bolt pattern to 6 x 5", but that would be easy enough to change to 6 x 5.5" if a guy wanted. Do you have any idea on the width of these in the TBSS application?

you can also try to key word try too find 1990-93 454ss they have 14 bolts in them my old man has a 1990 454ss

[djracer]

I personally don't understand why anyone would run anything other than a 9 inch in a street or strip ride.

[!970C10540]

Originally Posted by djracer

I personally don't understand why anyone would run anything other than a 9 inch in a street or strip ride.

Because a true Chevy Man will never run afford product like a rear end, transmission, or a motor from a lowly ford the bestt thing they make is electric fans. 12 bolts are superior to 9inches and Dana 60s for the fact that they have less parasitic power lose than the two off brands.

[regan wilson]

Originally Posted by !970C10540

Because a true Chevy Man will never run afford product like a rear end, transmission, or a motor from a lowly ford the bestt thing they make is electric fans. 12 bolts are superior to 9inches and Dana 60s for the fact that they have less parasitic power lose than the two off brands.

I will let you build me one and we will see how long it takes me to make spaghetti out of it.

[Marv D]

Kevin.

... and besides,, if someone truly has a 'bullet proof' rear end of any flavor,,, All I can say is you ain't making enough power and don't have enough traction!!! Given enough power you can destroy just about anything. After I twisted 1 Strange axle, then snapped another, Strange themselves sent me to the Dutchman and he forged me a couple out of his special allow. Yup,, here it is.
http://small-block-chevy.com/images/662010/axle2.JPG (big picture)
That's what let go in initial testing of the ol 66 in Feb.

A set of Mark Williams axles in there now. Big tires,,, dead hooking... Somethings gonna give. Again fortifying my point... nothing is 'bulletproof'

[KQQL IT]

Marv Thats a sweet pic...

[Marv D]

proof that my dad was right. Given enough time I could break an anvil .

Yeah that pic is a cool example of the grain structure of a forged alloy ain't it!

[KQQL IT]

Pops used to run 40spline summer bros in his off road racer and would replace them after a full turn...
Posted via Mobile Device

[bigjimzlll]

Originally Posted by KQQL IT

Pops used to run 40spline summer bros in his off road racer and would replace them after a full turn...
Posted via Mobile Device

I run an old set of Top Fuel Summer Bros axels in my junk. They are only 26 spline but are the same diameter of a 40 spline.
I was going to swap them out, but they are still str8 and un-twisted

[Blue Rat]

Thanks guys for the posts. I did not mean literally bullet proof. Just want something that I do not have too go through in six months after building it.

[KQQL IT]

Pops old class 4 racecar. Built in 76, still racing today.

[Rannos]

I would beef up the 12 bolt truck rearend. My brothers 65 went a best of 8.90's on a 12 bolt with 468 with a trans break. Here is a link of the video the night the trans break started to fail.... you'll notice as he staged the truck starts creeping.

‪65 chevy truck‬‏ -...

[fastwillie 696969]

1/8 mile ?

[Rannos]

That pass is 1/8th yes... he ran high 5.70 to 6.0's in the 1/8th.

[fastwillie 696969]

if you build it they will come

[68 C-10 KID]

If ya plan on running big slicks and big power take the advise from the other members and weld the tubes up to the center section.
This happened to me last night from not having the tubes welded.

[KQQL IT]

Thats ugliness.

[djracer]

I hate to see that happen to you. How much stuff did it tear up?

[68GMCCustom]

ouch

[fastwillie 696969]

what pinion angle is that set at ?

[BigDan3131]

If money were no object I would be all over a Halibrand Quick Change in a heartbeat but because money is unfortunately an issue I would buy a Strange S-60 rearend.