MC_Rudy
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Posts posted by MC_Rudy
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For the guys who have already done a LS swap on their Montes I have a few questions. I am looking to switch over to a 6.0L and 4L80E, but my Monte is still has the factory set.
1) Did upgrade your front brakes and rotors because of the LS swap? If so, did you have to switch over to a bigger rim and tire?
2) Did you have to change out your cross-member to run dual-exhaust?
3) Is there a setup with the 4L80, whether it a long shaft or normal, that will allow me to use my current drive shaft?
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I've been looking at 12-bolt rear ends on Facebook and Craigslist and I came across a few, but I am unsure if I can use them. From the post above I am pretty certain that I will be able to use a rear end from a A-body. But I am seeing a some from (67-72) C10 trucks, (80, 82-92, & 88) Camaro, (78) Caprice, and a (69) truck w/ 6 lugs (??) Can I use any of these?
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On 5/22/2019 at 9:52 AM, Mike Brichta said:
One of my 70 Montes came originally with a bop 2- something open rear and i converted it to a 3.55 posi pretty easily. A club member helped me with the conversion with parts and instructions. All I needed to purchase was the posi unit, new ring gear and some shims. The pinion did not need to be touched. Maybe someone in the club can help you do the same. I didn't know anything about rears and did the conversions by myself over the weekend.
Good luck!!
Mike
Hey Mike,
By chance do you have any rear-ends for sale for a 72 MC?
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18 minutes ago, jft69z said:
Nothing is cheap anymore, that's for sure. I broke a 10 bolt years ago (in my first '72 Monte). Sheared the pinion gear in half. That corner up the street from my parent's house smelled like gear oil the whole entire hot summer,
🤣🤣 I tried to send Mike Brichta an email to see if he still has rear ends for sale, but I got an error message stating he cannot receive emails. Are the 8.2" 10-bolt rear ends that bad off or is this about beefing up the rear-end? Lets say I am able to obtain a 12-bolt posi-rear end is it a direct bolt on or will I need to make modifications so that it will fit?
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Well jft69z the problem is finding a 12-bolt rear end or a 8.5" 10-bolt rear end that is in the price range of just replacing the parts on my rear end. I've called many junk yards in my are looking for a 12 bolt rear end and most done have them. If they do have them they want at least $1500 (non-posi) for the rear end and then I will have to convert that rear-end. The cheapest 10-bolt posi rear-end I've come across was $1000 (not even sure if it was an 8.5" 10-bolt) but I would have had to get it shipped to me. With my current rear end (with me spurging on parts) I am looking at about $1100-$1200 installed and that would include a "high-strength" alloy axle kit, richmond gear ring & pinion set, the Detroit TruTrac diffenential, and the miscellaneous thing like fluid, shims, and bearing. Couldn't speak on which rear end is more durable or better, simple because I lack the knowledge to make a quality case for either. To be honest I didn't even know a 10-bolt posi rear end was possible until reading post in this forum. What I can tell you is that I have no plans to race my car, but I do plan to rip up and down the highway every chance I get 😁.
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On 5/23/2019 at 10:54 AM, Blackhawk said:
I believe all 10 bolts were 28 spline stock. Chances are you have the 8.2" rear if it's stock, but make sure using the photos Steve posted. Are you planning on buying new gears for the posi? If you are then it won't really matter what the current gear ratio is. For an overdrive I would recommend 3.36, 3.55, or 3.73 gears, depending on the intended use for the car.
On 5/23/2019 at 11:35 AM, MC1of80 said:Blackhawk, I beg to differ on the rear ratio. He needs to know what ratio to get the corresponding posi unit. 3 series, 4 series etc. Although he may be better off getting a better gear ratio especially if the rear ratio he has now is a 2 something. Finding a posi for a 2 series ratio is usually difficult.
As Blackhawk stated, the 10 bolts are usually 28 spline and 12 bolts are 30 spline for our cars.
Thanks cny first gen 71 for the pic of the rear ends as it was super helpful aiding me in identifying the which rear end is on my monte.
Blackhawk and MC1of80,
I have a 8.2" 10-bolt rear end and I would like to go with the Detroit Trutrac, but I haven't been able to find one that fits my application on summit or jegs. When I searched the Eaton site the options that I was able to fine was posi limited-slip differential 19603-010, but I have a felling this is not the part you meant. I do plan to change out the gears when doing the differential and I am thinking about going with a 3.55 or 3.73 gear ratio. Which if I am understanding all of this correctly I will need a 3-series differential for this application.
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48 minutes ago, MC1of80 said:
Hey MC Rudy,
If all you are changing is the carrier unit it's a fairly easy thing to do. First you need to find out what 10 bolt you have. Order the correct posi unit. I recommend the Detroit trutrac. Great unit and uses regular differential fluid with no additive.
As far as the swap, along with the posi unit I suggest putting new carrier bearings also. Then it's pretty much pulling the old carrier out, swapping the ring gear, installing the new posi unit, reassembling.
It's a little more involved but that's the basics. As long as you are not changing gear ratios, no need to go crazy with shims and pinion depth and such.
Hey Mike & MC1of80,
Thank you both for the info. I will look into the Detroit Trutrac. Is there an easy way to figure out if my car has a 28- or 30-spline. Needless to say, I have a ton of homework to do before jumping into this because I have so much information to figure out.
Thing I don't know but need to know: (If there is anything else please let me know)
-> 8.2" or 8.5" 10-bolt
-> 28- or 30-spline
-> Gear ratio
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If I have a 10-Bolt non-posi rear end can it be converted into a posi rear end? My plan is to swap to a 700-R4 transmission and I would like to have a posi rear end to go with it. Is it as simple as dropping in a kit like this and boom you have a posi rear end? I actually don't know what size my 10-Bolt rear end is and I don't know much about this kind of stuff so any advice would be appreciated.
https://www.quickperformance.com/GM-85-10-Bolt-Posi-Gears-Bearing-Kit-Package_p_20372.html
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Trying to figure out the best way to approach the restoration of my 72 Monte Carlo. I am not looking for showroom quality; however, I do want it to look nice while driving around. In this instance will it be wise to do a rolling restoration or a frame off restoration? The car has major rust issues in the trunk, but the rest of the car isn't too bad. FYI... I have most of the big sheet metal items to restore the trunk and rear quarter panels. Link to pics are below
https://drive.google.com/folderview?id=0B06Pw4i_3FlranVmNEpNWEx3XzQ&usp=sharing
Question about LS swap process
in Modifiers
Posted
Currently I have 350/th350 in the car now. Are there companies that make driveshafts for this purpose (ready to ship with the correct specs) or will I have to measure? My main concern is having to go out and find a yoke from whatever vehicle I get the 4L80E out of and have it mated to a driveshaft especially if I have to buy a new one.