Rear end ratio - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rynobuilt · 08-31-2018, 01:53 PM

I’ve trying searching and I’m not seeing the numbers on my 12 bolt in my 71 listed on any of the posted sheets on the form and interwebs. Can anyone I’d what ratio this should be. Of coarse i can open it up and count, but I’d like to know now what might be inside! It has a posi tag on it. Feels like there is a posi inside.
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rynobuilt · 08-31-2018, 01:55 PM

Posted via Mobile Device

rynobuilt · 08-31-2018, 01:56 PM

I’m trying to do this from my phone in my shop so hopefully the pics shows up...
Posted via Mobile Device

OregonNed · 08-31-2018, 03:45 PM

I'm not sure those numbers will correlate with the ratio, but would be cool if it did.. pulling the cover and looking at the numbers on the ring are easier, but the garage smells funny for a while afterwards!

**LockDoc** · 08-31-2018, 04:52 PM

Quote:

Originally Posted by rynobuilt

Posted via Mobile Device

According to these charts I posted back in 2013 "THB" would be a 1971 c-10, 3.07:1 w/Positraction

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

LockDoc

4carbcorvair · 09-01-2018, 08:10 AM

Thanks for starting this post. It inspired me after work to change the gear oil in my HO72 and find out exactly what I had for gears. 7-32 stamped on the ring gear, 4.57 gear ratio. I knew it was low. lol

rynobuilt · 09-01-2018, 10:05 AM

Quote:

Originally Posted by LockDoc

According to these charts I posted back in 2013 "THB" would be a 1971 c-10, 3.07:1 w/Positraction

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

LockDoc

bingo, thank you!
every other chart is saw only had 2 letters and nothing was matching up.

08-31-2018, 01:53 PM	#1
rynobuilt Registered User Join Date: Aug 2018 Location: sw mo Posts: 11	Rear end ratio I’ve trying searching and I’m not seeing the numbers on my 12 bolt in my 71 listed on any of the posted sheets on the form and interwebs. Can anyone I’d what ratio this should be. Of coarse i can open it up and count, but I’d like to know now what might be inside! It has a posi tag on it. Feels like there is a posi inside. Posted via Mobile Device

08-31-2018, 01:55 PM	#2
rynobuilt Registered User Join Date: Aug 2018 Location: sw mo Posts: 11	Posted via Mobile Device Attached Images

08-31-2018, 01:56 PM	#3
rynobuilt Registered User Join Date: Aug 2018 Location: sw mo Posts: 11	Re: Rear end ratio I’m trying to do this from my phone in my shop so hopefully the pics shows up... Posted via Mobile Device

08-31-2018, 03:45 PM	#4
OregonNed Registered User Join Date: Dec 2012 Location: Vancouver, Washington Posts: 1,644	Re: Rear end ratio I'm not sure those numbers will correlate with the ratio, but would be cool if it did.. pulling the cover and looking at the numbers on the ring are easier, but the garage smells funny for a while afterwards! __________________ 1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop

09-01-2018, 08:10 AM	#6
4carbcorvair Registered User Join Date: Feb 2018 Location: Gorham, ME Posts: 96	Re: Rear end ratio Thanks for starting this post. It inspired me after work to change the gear oil in my HO72 and find out exactly what I had for gears. 7-32 stamped on the ring gear, 4.57 gear ratio. I knew it was low. lol __________________ 68 K20 Custom Camper/CST Wrecker. 97 GMC K1500 short bed reg cab.

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