Truck 10 bolt in an Fbody (yes we can) - LS1TECH



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Truck 10 bolt in an Fbody (yes we can)

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Old 08-25-2016, 04:57 AM   #1
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Default Truck 10 bolt in an Fbody (yes we can)

Just finished fabing one up. Pictures and details to follow. It's too late and too beer now.
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Old 08-25-2016, 05:25 AM   #2
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Is this an 8.5 10 bolt?
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Old 08-25-2016, 09:59 AM   #3
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Is this an 8.5 10 bolt?
if it is, it's how they should have shipped from GM
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Old 08-25-2016, 10:04 AM   #4
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if it is, it's how they should have shipped from GM
My thoughts exactly!
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Old 08-25-2016, 07:40 PM   #5
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GM could have probably put 12 bolts in our cars for less than $100 extra back then.
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Old 08-25-2016, 10:09 PM   #6
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Hurry up and post some pics!!
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Old 08-26-2016, 12:04 PM   #7
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Anything can be fabbed. Any rear end can be put in any car. Its a matter of is the work worth the effort and is it (tools, skills) accessible to each person.
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Old 08-26-2016, 12:31 PM   #8
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Anything can be fabbed. Any rear end can be put in any car. Its a matter of is the work worth the effort and is it (tools, skills) accessible to each person.
I'd love to know how hard it is to fab and the end cost. Hopefully the OP will tell us
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Old 08-26-2016, 12:39 PM   #9
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I'd like to see this as well, dude was still drinking at 6am yesterday lol, he might take a while to recover.

How much HP was a 83 model putting out? A 7.5 was plenty back then. But yeah, an 8.5 should have been factory by the time 4th gens came out. They had em so wtf.
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Old 08-26-2016, 02:15 PM   #10
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The obvious issues to me is the brackets are wrong, no torque arm mount, and its too wide. Well if youre gonna fix all that **** why not just go with a 12 bolt or 8.8? Seems like if this was a viable it would have already been done.
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Old 08-26-2016, 02:17 PM   #11
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Is the tube size the same?
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Old 08-26-2016, 04:06 PM   #12
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How much HP was a 83 model putting out? A 7.5 was plenty back then. But yeah, an 8.5 should have been factory by the time 4th gens came out. They had em so wtf.
The 8.5" had already been a factory rear for the F-bodies in the 2nd gen cars, even the late ones with less power than the TPI 3rd gens. A late 2nd gen Z28 made half the power of a LS1 4th gen, yet it got an 8.5 because the underpinnings were already compatible with that rear from earlier in the '70s.
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Old 08-26-2016, 07:40 PM   #13
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GM really counted their freakin beans when fitting these 10 bolts to LS powered cars. It looks more like it should be behind some 1980's asthmatic 4 cylinder.

I need to ditch my 10 bolt before I kill myself and i was having thoughts of getting a mopar '8 3/4' done for mine, because I believe it could be 1 tenth faster than a 9".

The dodge 8 3/4 is huge infront of our 10 bolt. Ive riden in big block cars that couldn't kill one on sticky tires. S60 is better but the 8 3/4 has 2.73 gears available for the street and has a removable center section like a 9" so you can swap out centers.

Or maybe it wont be any quicker than a 9" and it'll just eventually break easier and I just do all that for nothing

Some guys seem to get good gains with using lighter driveline components, others nothing. I guess there's too many variables in car setups.
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Old 08-26-2016, 08:01 PM   #14
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The dodge 8 3/4 is huge infront of our 10 bolt. Ive riden in big block cars that couldn't kill one on sticky tires.
The same is true of the GM 8.5" 10-bolt. It also looks huge next to the 7.5" and can be made to handle tons of power. Even stock it's almost as strong as the 8.875" 12-bolt. I've known many Grand Nationals (they came stock with the 8.5") to run some crazy times on this rear.

It doesn't have the center section benefit that you mentioned about the Mopar rear, but I assume it's lighter than the 12-bolt or other typical options for the 4th gen. If there is a cost effective way to make the 8.5" work, it's a very solid rear with lots of potential and gear options.
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Old 08-26-2016, 09:22 PM   #15
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GM really counted their freakin beans when fitting these 10 bolts to LS powered cars. It looks more like it should be behind some 1980's asthmatic 4 cylinder. I need to ditch my 10 bolt before I kill myself and i was having thoughts of getting a mopar '8 3/4' done for mine, because I believe it could be 1 tenth faster than a 9". The dodge 8 3/4 is huge infront of our 10 bolt. Ive riden in big block cars that couldn't kill one on sticky tires. S60 is better but the 8 3/4 has 2.73 gears available for the street and has a removable center section like a 9" so you can swap out centers. Or maybe it wont be any quicker than a 9" and it'll just eventually break easier and I just do all that for nothing Some guys seem to get good gains with using lighter driveline components, others nothing. I guess there's too many variables in car setups.
I went round and round on this too. In the end went with a fabbed nine. For the money and the effort, it was the only way to get lighter than the stock ten bolt, handle plenty of power, and have the available parts from many sources.

But had GM simply used the 8.5 in the first place like in lots of S10's, that would have been great.
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Old 08-27-2016, 08:20 AM   #16
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I went round and round on this too. In the end went with a fabbed nine. For the money and the effort, it was the only way to get lighter than the stock ten bolt, handle plenty of power, and have the available parts from many sources.

But had GM simply used the 8.5 in the first place like in lots of S10's, that would have been great.
S60 or M9 it is for me also. I don't trust the 8 3/4 will eventually hold up as well. Braking driveline parts isn't fun.

Funny on the weight some guys say they hooked better and et quicker with S60 due to the extra weight pushing down on the tires.
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Old 08-27-2016, 09:04 AM   #17
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Originally Posted by Launch View Post
GM really counted their freakin beans when fitting these 10 bolts to LS powered cars. It looks more like it should be behind some 1980's asthmatic 4 cylinder.

I need to ditch my 10 bolt before I kill myself and i was having thoughts of getting a mopar '8 3/4' done for mine, because I believe it could be 1 tenth faster than a 9".

The dodge 8 3/4 is huge infront of our 10 bolt. Ive riden in big block cars that couldn't kill one on sticky tires. S60 is better but the 8 3/4 has 2.73 gears available for the street and has a removable center section like a 9" so you can swap out centers.

Or maybe it wont be any quicker than a 9" and it'll just eventually break easier and I just do all that for nothing

Some guys seem to get good gains with using lighter driveline components, others nothing. I guess there's too many variables in car setups.
my grandfather made 3 Chrysler 8 3/4 rear ends for f bodies , one for my dad 77 trans am , one for an 82 camaro and one for my 85 trans am . So it can be done . Only thing that sucks is the drum brakes or you have to spend money on aftermarket disc brakes.
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Old 08-27-2016, 01:57 PM   #18
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S60 or M9 it is for me also. I don't trust the 8 3/4 will eventually hold up as well. Braking driveline parts isn't fun. Funny on the weight some guys say they hooked better and et quicker with S60 due to the extra weight pushing down on the tires.
I actually thought very hard about it for that exact reason. But it's unsprung weight on a street car. Not the best for handling. Plus the easier ratio changes if needed and the number of ratio options. Hard to beat a nine inch
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Old 08-27-2016, 03:24 PM   #19
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I had an 8.5 (well 8.6, technically) in my Trailblazer and always thought that rear end should have been under the 4th gen. I think it is the same 8.5 guts in my Silverado too. Did they ever even use the 7.5 on any other platform? You'd think it would have been cheaper to use the otherwise ubiquitous 8.5 in the fbody like they used the 4L60E in almost everything RWD aside from the HD trucks.
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Old 08-27-2016, 09:21 PM   #20
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the 7.5 was in all the s10 variants , it was in a lot of g bodies too including rwd monte ss's .

I think Monza/vega etc... and variants of those basically low hp 70's and 80's stuff got them while higher perf 72-81 chevelles , Camaros , firebirds , novas ,venturas etc... got 8.5's and a couple g bodies gn ,t type , 442 and cant recall if the grand prix 2+2 got it also.

I had a couple monte ss's 87 and 88 and felt ripped off that the slower 442's got the beefy rear lol
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