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#1 |
Registered User
Join Date: Feb 2008
Location: texas gulf coast
Posts: 211
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61 ho 32 to 64 12 bolt ?
Is the 64 12 bolt rear diff a " bolt in" replacement for a 61 ho 32. Panhardbar mount looks good but I was wondering if the trailing arm mounts were the same .thanks!
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#2 |
Registered User
Join Date: Dec 2012
Location: Bangor, Michigan
Posts: 375
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Re: 61 ho 32 to 64 12 bolt ?
Do you have an Eaton Ho 32?
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That's the thing about a Chevrolet, no matter how they look, whether it be a trailer queen or a good ol' used farm truck, no other truck on the road will always look that damn good wearing a Bowtie. |
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#3 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
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Re: 61 ho 32 to 64 12 bolt ?
You will have to move the trailing arm mounts on the 12 bolts since the '60-'62 trailing arms are farther apart. The '61 panhard bar should work with the '64 12 bolt
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#4 |
Registered User
Join Date: Feb 2008
Location: texas gulf coast
Posts: 211
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Re: 61 ho 32 to 64 12 bolt ?
Thanks captain !
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#5 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
How about the length of the driveline?
Can I remove my 62 Ho32 and mount a 65 12-bolt without modifying my driveshaft? ![]() ![]() ![]()
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#6 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
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Re: 61 ho 32 to 64 12 bolt ?
Having not done that swap, I do not know for sure. I can measure a 12 bolt and a HO32 at the shop tomorrow and let you know.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#7 |
Registered User
Join Date: Feb 2008
Location: texas gulf coast
Posts: 211
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Re: 61 ho 32 to 64 12 bolt ?
I still haven't swapped mine out so I can't answer your question,but that's an angle I didn't look at
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#8 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
You've had over a year! :-D
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#9 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
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Re: 61 ho 32 to 64 12 bolt ?
Okay here's what I came up with. These measurements are not ultra precise, but are fairly close. With the truck 12 bolt, the center of the axle tube to the center of the U-joint on the pinion yoke measures 11-5/8". The Eaton HO32 measures 12-1/4" from the center of the axle tube to the center of the U-joint on the pinion yoke. So the driveshaft will technically be 5/8" too short if you swap in a truck 12 bolt, but with that small amount it may be fine. It just depends on your particular driveshaft and trans.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#10 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
Thanks
That helps a lot. I want to go to a th350 from my sm420. I didn't want to size my driveline to the ho32 and then have to do again when I went to the 12-bolt.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#11 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
Now that I have a 12-bolt that I can measure, I just did some measurements of my own.
I got pretty much the same measurements as Captain. Also, it looks like I won't have to remove the existing axle perches. The trailing arms on the 62 are far enough apart where I should be able to mount the new perches right next to the existing ones.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 Last edited by LostMy65; 09-21-2015 at 08:00 PM. |
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#12 |
Registered User
Join Date: Apr 2015
Location: NICHOLS SC
Posts: 435
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Re: 61 ho 32 to 64 12 bolt ?
On my 62, the pan hard bracket had to move over in order to use the 62 bar. Or you could get and adjustable. I was paying a welder anyways so just moved mine. Not sure about the perches as we removed the 64 ones and put a set of captains new ones on. Seems like the old ones had to come off to get the same measurement as the ho32.
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#13 |
Active Member
![]() Join Date: Nov 2011
Location: Los Angeles, CA
Posts: 113
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Re: 61 ho 32 to 64 12 bolt ?
It was a while ago when I put a 12 bolt from a '64 in my '61 Panel. It was the same width. Did have to move & re-weld the brackets but other than that, it was fairly simple. Can't remember if I changed the pan hard. Current piece is non-adjustable about 33" long. Can't remember if I had to change U joints.
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#14 | |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
Quote:
. Do you remember if you had to resize your driveline? I just dbl checked my 65 12-bolt and my 62 Eaton Ho32, and the 65 12-Bolt looks to be at the very most, 1 inch shorter than the 62 Ho32.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#15 |
Active Member
![]() Join Date: Nov 2011
Location: Los Angeles, CA
Posts: 113
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Re: 61 ho 32 to 64 12 bolt ?
It was 20 years ago but I really don't think I had to make any changes to the driveshaft. To be honest, I don't know if I did check to see if the lengths of the two rears were different. I used a straight panhard bar at 33 5/8". Haven't had any rear end issues since the swap.
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#16 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
Thanks
It's neat you've had your truck so long.
__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#17 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: 61 ho 32 to 64 12 bolt ?
Anyone know the Torque requirements for the axle mounting U-Bolts?
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#18 |
Registered User
Join Date: Feb 2013
Location: Columbus, MS
Posts: 448
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Re: 61 ho 32 to 64 12 bolt ?
Just ran across this thread and wanted to share what I have. I swapped out the 1960 HO32 for a 1965 12 bolt and always thought it may have been a tad too short. It never gave me any issues so ran it for years. I recently found out I have an unpleasant vibration just over 90 mph. Checked pinion angles, tranny mounts, axles, every thing but according to a drive train specialist in this area, my driveshaft is short. This seems to be the cause of the vibration. Just an FYI...
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