KS10 rear end

[Asshat]

Originally Posted by Flathead Smith

To remove the third member you only need to:



Finding the 4:11 third member will be your toughest part, but if you do, the install is easy.
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There is another option and that is to use a A833/NP833/MY6 transmission in place of your four speed (most likely a Muncie SM420), or one of the more modern 5 speeds used in 1988 and up year Chevy/GMC trucks. The more modern five speeds will have a good gear spread and have an overdrive, which will turn your 4:56 into a ≈3:30 in OD, and really may be your best solution.

About two years ago I went looking for a A833 and actually found two on the same day. The A833 transmission was found in 1980-87 Chevy Trucks/Vans/Step Vans. The aluminum cased version of the transmissions was used for sure in the 2WD 1/2 ton with the gasoline engine. The cast iron version was used in the 4WD (MM7) and Diesel 3/4 ton version (and possibly the 1/2 ton diesel version also). I was able to get both the 2WD and 4WD cast iron version, which I prefer.

Is the A833/NP833 trans the same thing, or two different transmissions? Seems like the A833 does not have overdrive, you have to add it. Is this true?
Does the NP833 have overdrive? And it bolts to a 292 ?

[Asshat]

Can someone identify this trans? It’s a 3 speed OD trans, just not sure which model.

[cwcarpenter98]

Looks like a 4 bolt side cover Chevy 3 speed overdrive. If you are planning on putting that in your truck, you'll need to either use a floor shifter or swap columns to a column shifter. Easiest would probably be to leave it as a floor shifter since you already have the factory 4 speed

[LostMy65]

Originally Posted by Asshat

Since I have the 4:56 rear end, how much difference would there be going to a 4:10? Is it even worth it?

Here is an rpm chart.

[Asshat]

Originally Posted by cwcarpenter98

Looks like a 4 bolt side cover Chevy 3 speed overdrive. If you are planning on putting that in your truck, you'll need to either use a floor shifter or swap columns to a column shifter. Easiest would probably be to leave it as a floor shifter since you already have the factory 4 speed

Originally Posted by LostMy65

Here is an rpm chart.

Thank you!

[Asshat]

I got a quote rom MDL to install a 5-speed. $3982.00.

I don't think I will be taking my truck to Idaho, however, they do provide some good information.

What do you guys think?

[LostMy65]

Here are a couple threads for how to swap out to a 14-bolt:
http://67-72chevytrucks.com/vboard/s...d.php?t=550878
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http://67-72chevytrucks.com/vboard/s...d.php?t=624445
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[Asshat]

OK - must be an SM420.
http://www.novak-adapt.com/knowledge...s/manual/sm420

[Asshat]

Originally Posted by cwcarpenter98

Looks like a 4 bolt side cover Chevy 3 speed overdrive. If you are planning on putting that in your truck, you'll need to either use a floor shifter or swap columns to a column shifter. Easiest would probably be to leave it as a floor shifter since you already have the factory 4 speed

1. Does anyone have pics of what the shifter would need to look like?

2. Is it easy to adapt?

3. Would I have to cut up my transmission cover? It doesn't seem to be the same a top-loaded trans.

2. How is the tailshaft connected? Some special yoke?

[cwcarpenter98]

Originally Posted by Asshat

1. Does anyone have pics of what the shifter would need to look like?

2. Is it easy to adapt?

3. Would I have to cut up my transmission cover? It doesn't seem to be the same a top-loaded trans.

2. How is the tailshaft connected? Some special yoke?

I don't have a picture of a floor shifter, but it is not a top-loaded trans. Pretty much any transmission that you swap in will require some sort of modification for your cover.

It uses a slip yoke on the transmission end of the driveshaft. The picture you posted shows the part of the slip yoke that attaches to the u joints.

If you're looking for something that has the shifter more on top and in the middle, an s10 5 speed would be a good option behind the 292

[Asshat]

Originally Posted by cwcarpenter98

I don't have a picture of a floor shifter, but it is not a top-loaded trans. Pretty much any transmission that you swap in will require some sort of modification for your cover.

It uses a slip yoke on the transmission end of the driveshaft. The picture you posted shows the part of the slip yoke that attaches to the u joints.

If you're looking for something that has the shifter more on top and in the middle, an s10 5 speed would be a good option behind the 292

Is the S10 5 speed an overdrive trans?

[cwcarpenter98]

Originally Posted by Asshat

Is the S10 5 speed an overdrive trans?

Sure is. The earlier S10 5 speeds also had a cable driven speedometer. You'll most likely still have to modify your trans hump somewhat, but the shifter will still be in line with the current one. Member Lugnutz65 has some great stuff on swapping those transmissions in

[Asshat]

Will a Tremec T45 work for my setup?
It’s overdrive 5-speed, right?

[Asshat]

This guy on FB has a T 5 from a 91 S10. Will this work?

[cwcarpenter98]

You could make it work, but you would need to remove the bellhousing mount crossmember from your truck, then purchase or fabricate a mount for the rear of that transmission. You will also need something to convert the electric speedo sensor to manual if you want to keep the stock gauges. The s10 transmissions that you can bolt to your factory bellhousing is from the mid to late 80s

[Asshat]

Well, going to hold off on the trans for a couple weeks. Just pulled the 4-speed out; hopefully picking up an engine hoist tomorrow morning and then pulling the motor.

[Asshat]

Originally Posted by Flathead Smith

If it were me I would find a HO52 (3/4 ton third member) or HO72 (one ton third member) with 4:11 gears and then take out the KS-10 Locker from your differential, and drop into the new differential. If you do not wish to use the locker, there are some here who would buy it from you, including me.

https://www.speedwaymotors.com/1960-...Kit,46251.html

https://www.ebay.com/itm/1963-72-Che...-/172466216108

https://welderseries.ecwid.com/Unive...Rear-p51463697

https://reactsuspension.com/products...2-c10-6372-008

Just so you know, if you have the old style HO52 third member with the double-row ball pinion bearing, a 4:11 ring gear set will not fit. I suspect these third members had a design change around 1967 and started using a double-row taper bearing on the pinion. But I have seen conflicting information on this for example Yukon.

The double pinion may also have something to do with the load bolt design of the HO72...I am not sure. When you go to Yukon gear & axle they show the ball bearing pinion bearing being used on the non-load bolt HO72 from 1960 - 1972 and the taper bearing being used on the load- bolt HO72 from 1960 - 1972. But I think Yukon’s information is wrong.

I have heard that there was a 3:90 ratio available for the HO52/HO72, but I have never seen one. It may have been an aftermarket offering.

How difficult is it to remove the locker from the KS10?

[Asshat]

Anyone know where to get a drain plug for the rear end? It is 1” diameter, fine thread.

[spudder]

Here are my thoughts on your situation. I would try to locate a later rearend from a '70-'72 Chevy 3/4 ton truck. Most have a coil spring suspension like your truck. More than likely, the rearend will have 4.11 gears. I had one years ago with 3.54 gears.
Using this rearend, will be a direct bolt-in with the exception of the panhard bar. As stated earlier, the later rearends had a boss cast into the upper right corner of the center section for the panhard bar. In your case I would buy an aftermarket panhard that has it's right side mount on the right side trailing arm perch.
Another consideration, the drive shaft might not be the correct length.
I don't think you would like 4.11 gears using your stock transmission. Too many RPMs at highway speeds. An overdrive trans is the cure but pricey. No way would I use a T5 transmission in a 3/4 ton, they are pretty weak and can't stand a lot of torque. An NV 4500 out of later trucks would be a good choice for a manual but they are pricey and very much in demand.
It depends on what you plan to use your truck for. Just cruising is one thing, but if you plan to use it as a truck, put it together with the heavier components.

[Asshat]

This would work, right ?

Out of a c20, not sure what year. 14 bolt.

[Captainfab]

Yes that will work if you don't plan on hauling heavy loads. That is a semi-floating 9.5" 14 bolt. You will need to weld on the trailing arm mounts and a panhard bar mount. I make both of those. With that said, I agree that to achieve what you are wanting an OD trans is needed. In my experience the Eaton HO52 is often times a noisy differential.

Originally Posted by Asshat

This would work, right ?

Out of a c20, not sure what year. 14 bolt.

[Asshat]

Originally Posted by Captainfab

Yes that will work if you don't plan on hauling heavy loads. That is a semi-floating 9.5" 14 bolt. You will need to weld on the trailing arm mounts and a panhard bar mount. I make both of those. With that said, I agree that to achieve what you are wanting an OD trans is needed. In my experience the Eaton HO52 is often times a noisy differential.

Thanks Captain, can you post pics of those and prices? Trying to get an idea of what I am dealing with.

[Captainfab]

Here is the for sale thread for the trailing arm mounts.

http://67-72chevytrucks.com/vboard/s...d.php?t=620836

I do not have one for the panhard bar mount is it is quite new. I have only sold 2 so far. The cost is $39.50. It is basically a copy of the factory bracket.

[Asshat]

Saw a Dana 60, 14 bolt, 8 lug I could possibly use in my truck. Only thing, it does not have the drums. Are the drums easy to find?