Rear end gear ratio - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Killer Bee · 08-16-2018, 04:21 PM

^^ yah, but if his grandkids are on the board, they'll be convinced they HAVE to remove the cover, cuz you know the original owner, the second owner, grandpa, aunt Betty and the local garage all changed the gears at one time regardless of any identification markings

just funnin', I love you guys!

**Captainfab** · 08-16-2018, 11:40 PM

I typically suggest pulling the cover and having a look, plus the gear oil likely needs changed anyway. But that is not the answer most people want to hear. For some reason people seem to think there is some voodoo involved in working on a differential.

forestb, that is an original style Eaton HO32/33 differential.

*YoungPup1977* · 08-17-2018, 10:45 AM

Quote:

Originally Posted by forestb

that photo is around a year and a half old.

.

Good luck !!!

*YoungPup1977* · 08-17-2018, 10:50 AM

Quote:

Originally Posted by Killer Bee

^^ yah, but if his grandkids are on the board, they'll be convinced they HAVE to remove the cover, cuz you know the original owner, the second owner, grandpa, aunt Betty and the local garage all changed the gears at one time regardless of any identification markings

just funnin', I love you guys!

This stuff only happens in California..... LOL!!!!!

*YoungPup1977* · 08-17-2018, 10:59 AM

Quote:

Originally Posted by forestb

I was under the impression that you can determine your rear end gear ratio by rotating one tire and watch and see how many times the other tire turns in the oppisit direction. When I did this it was one to one. I must have been mistaken. Now that I think about it should I have been comparing the drive shaft to the tire?

I had to read this post three times..... the third time I got it....now that I think about it I should of been watching the mark on the u joint

forestb · 08-17-2018, 11:25 AM

"just funnin', I love you guys!" You sure fooled me.

Killer Bee · 08-17-2018, 02:20 PM

Quote:

Originally Posted by forestb

"just funnin', I love you guys!" You sure fooled me.

I drop a one-liner for levity occasionally but please look more carefully at my posts on this board..

I spend a fair amount of my valuable time trying to be helpful here..
http://67-72chevytrucks.com/vboard/s...04&postcount=2
http://67-72chevytrucks.com/vboard/s...3&postcount=15
http://67-72chevytrucks.com/vboard/s...95&postcount=8

good luck!

forestb · 08-17-2018, 03:08 PM

I could respond but I won't.

Thank all you guys for your help.

*YoungPup1977* · 08-17-2018, 05:39 PM

Quote:

Originally Posted by forestb

i could respond but i won't.

Thank all you guys for your help.

qq

forestb · 08-17-2018, 06:12 PM

For the sake of all those that were helpful, it has a 3.73 gear ratio.

forestb · 08-17-2018, 06:16 PM

Quote:

Originally Posted by Killer Bee

I drop a one-liner for levity occasionally but please look more carefully at my posts on this board..

I spend a fair amount of my valuable time trying to be helpful here..
http://67-72chevytrucks.com/vboard/s...04&postcount=2
http://67-72chevytrucks.com/vboard/s...3&postcount=15
http://67-72chevytrucks.com/vboard/s...95&postcount=8

good luck!

Sorry Killer Bee I got mixed up by the quotes that comment was meant for someone else not you.

68gmsee · 08-17-2018, 09:03 PM

Quote:

Originally Posted by forestb

For the sake of all those that were helpful, it has a 3.73 gear ratio.

Out of curiosity how did you find the ratio? Remove the cover or rotate the tire?

Killer Bee · 08-17-2018, 09:04 PM

all good and my apologies if my comments were out of order..

one way or another, we'll learn something from all this!

good luck!

61K10 · 08-18-2018, 03:27 PM

3.73 and 3.90 are real close when using the tire rotation. No 3.73 gears were ever made for the ho. good luck.

forestb · 08-18-2018, 08:50 PM

I used the tire rotation technique.

forestb · 08-18-2018, 10:42 PM

I used the tire rotation technique. I think I will stay with what I have. From what I have been told it is a good drive around gear ratio.

**Captainfab** · 08-19-2018, 12:47 AM

You're going to want to run some tall tires with those gears.

*YoungPup1977* · 08-19-2018, 11:53 AM

What size of tire

forestb · 08-20-2018, 12:08 PM

I am currently running a fairly tall tire. 275/55R17 in the rear. Before everyone starts giving me advice (which I do appreciate), I have a small block 350 with a 700R4 trans. My rps are about 2000 at 70 mph.

sweetk30 · 08-20-2018, 01:00 PM

well if you are turning 2000 rpm at 70 mph then you might just have the rare gears .

your 275/55/17 = 28.91 dia / 700r4 / 70mph

3.90 = 2221 rpm @ 70mph
3.38 = 1925 rpm @ 70mph

08-16-2018, 04:21 PM	#26
Killer Bee Registered User Join Date: Jan 2016 Location: Barber City, CA Posts: 4,726	Re: Rear end gear ratio ^^ yah, but if his grandkids are on the board, they'll be convinced they HAVE to remove the cover, cuz you know the original owner, the second owner, grandpa, aunt Betty and the local garage all changed the gears at one time regardless of any identification markings just funnin', I love you guys! __________________ *I started out with nothing - and I still have most of it*

08-16-2018, 11:40 PM	#27
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Rear end gear ratio I typically suggest pulling the cover and having a look, plus the gear oil likely needs changed anyway. But that is not the answer most people want to hear. For some reason people seem to think there is some voodoo involved in working on a differential. forestb, that is an original style Eaton HO32/33 differential. __________________ 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

08-17-2018, 11:25 AM	#31
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio "just funnin', I love you guys!" You sure fooled me.

08-17-2018, 03:08 PM	#33
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio I could respond but I won't. Thank all you guys for your help.

08-17-2018, 06:12 PM	#35
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio For the sake of all those that were helpful, it has a 3.73 gear ratio.

08-17-2018, 09:04 PM	#38
Killer Bee Registered User Join Date: Jan 2016 Location: Barber City, CA Posts: 4,726	Re: Rear end gear ratio all good and my apologies if my comments were out of order.. one way or another, we'll learn something from all this! good luck! __________________ *I started out with nothing - and I still have most of it*

08-18-2018, 03:27 PM	#39
61K10 Registered User Join Date: Feb 2012 Location: pleasant valley--placerville ca Posts: 3,039	Re: Rear end gear ratio 3.73 and 3.90 are real close when using the tire rotation. No 3.73 gears were ever made for the ho. good luck. __________________ 1961 chevy K10 my build is------------61K10 build

08-18-2018, 08:50 PM	#40
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio I used the tire rotation technique.

08-18-2018, 10:42 PM	#41
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio I used the tire rotation technique. I think I will stay with what I have. From what I have been told it is a good drive around gear ratio.

08-19-2018, 12:47 AM	#42
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Rear end gear ratio You're going to want to run some tall tires with those gears. __________________ 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

08-19-2018, 11:53 AM	#43
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: Rear end gear ratio What size of tire Last edited by YoungPup1977; 08-22-2018 at 11:30 PM.

08-20-2018, 12:08 PM	#44
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,584	Re: Rear end gear ratio I am currently running a fairly tall tire. 275/55R17 in the rear. Before everyone starts giving me advice (which I do appreciate), I have a small block 350 with a 700R4 trans. My rps are about 2000 at 70 mph. Last edited by forestb; 08-20-2018 at 12:15 PM.

08-20-2018, 01:00 PM	#45
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Rear end gear ratio well if you are turning 2000 rpm at 70 mph then you might just have the rare gears . your 275/55/17 = 28.91 dia / 700r4 / 70mph 3.90 = 2221 rpm @ 70mph 3.38 = 1925 rpm @ 70mph __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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