what rear end ratio would 72 chevy 1/2 with 402 have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

oldblue1968chevy · 01-24-2010, 09:52 PM

what rear end ratio would 72 chevy 1/2 with 402 have

Found a guy with a 72 chevy parting out it had a 402 BB what gear ratio would it have and what else should I look for if I go look at it? Could it be posi by any chance?

thanks

tim21391 · 01-24-2010, 10:02 PM

my trucks a 402 and its a one legger.. i think its 3:08 in my truck

powell72 · 01-24-2010, 10:37 PM

All BB 1/2 ton 2wd's are 3.08's. I believe posi should be on the SPID.

oldblue1968chevy · 01-24-2010, 10:39 PM

wont that help my gas mileage?

Im not real sure what ive currently got but sorta wanted a lower (# higher) gear for more neck jecking takeoff lol

should i get a 308 or 373 or another gear?

I mostly do countryroad driving with some 55-60-65mph (traveling to get parts rarely)

a gas friednly gear would be nice for my HS wallet

what is something like this worth?

powell72 · 01-24-2010, 10:50 PM

3.08's is the lowest (numerically) gear these trucks had, if you're looking for quicker out of the hole and you're only cruising 55-60, 3.73's would be a better choice.
But 3.08's will be better mileage wise, do you have a tach? What kind of rpm's are you turning?

oldblue1968chevy · 01-24-2010, 10:55 PM

No tach so no idea

my truck was 3 spd on the column and v8 according to Vin (currently 350)

powell72 · 01-24-2010, 10:58 PM

It might be worth it to pull your cover and count teeth.

oldblue1968chevy · 01-24-2010, 11:13 PM

Yeah ought to do that, what'll I need, a new seal? and oil?

no tellin what it looks like lol

I6 3spd 1/2 ton would have 373

but mines v8 (acoring to vin) but it is a low optioned truck

oldblue1968chevy · 01-24-2010, 11:19 PM

I just got off the phone with the guy a lil ago and he said he wanted $75 for it he'll pull it

powell72 · 01-24-2010, 11:21 PM

I don't use a gasket, just sealer, but yes, a gasket and gear oil is all. I'm bettin' you already have 3.73's. But I've been wrong, just ask my wife.

oldblue1968chevy · 01-24-2010, 11:28 PM

black rtv work? how the heck do you fill it and put cover on without it draining lol and how much oil goes in it 80weight im assumin

powell72 · 01-24-2010, 11:31 PM

Quote:

Originally Posted by oldblue1968chevy

how the heck do you fill it and put cover on without it draining

Quickly.

Black RTV is fine, and yes, 80w90. I can't remember how much it holds, I'd grab 3 bottles.

$75 sounds pretty good for a complete rear.

oldblue1968chevy · 01-24-2010, 11:35 PM

thats what I thought duno if he'll come down or not...may ask about the cab mine is no good for sure rust everywhere...

may have to nab it because its 125 cheaper than everyone elses's 373 lol

3 qt bottles of gear oil (snythetic on the future 5 lug rearend??)

i plan on cleaning it up painting it before it goes on. should i replace bearings or brakes or a seal while im at it?

tim21391 · 01-24-2010, 11:52 PM

might as well.

01-24-2010, 09:52 PM	#1
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	what rear end ratio would 72 chevy 1/2 with 402 have what rear end ratio would 72 chevy 1/2 with 402 have Found a guy with a 72 chevy parting out it had a 402 BB what gear ratio would it have and what else should I look for if I go look at it? Could it be posi by any chance? thanks __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 10:02 PM	#2
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: what rear end ratio would 72 chevy 1/2 with 402 have my trucks a 402 and its a one legger.. i think its 3:08 in my truck __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

01-24-2010, 10:37 PM	#3
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: what rear end ratio would 72 chevy 1/2 with 402 have All BB 1/2 ton 2wd's are 3.08's. I believe posi should be on the SPID. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

01-24-2010, 10:39 PM	#4
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have wont that help my gas mileage? Im not real sure what ive currently got but sorta wanted a lower (# higher) gear for more neck jecking takeoff lol should i get a 308 or 373 or another gear? I mostly do countryroad driving with some 55-60-65mph (traveling to get parts rarely) a gas friednly gear would be nice for my HS wallet what is something like this worth? __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 Last edited by oldblue1968chevy; 01-24-2010 at 10:41 PM.

01-24-2010, 10:50 PM	#5
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: what rear end ratio would 72 chevy 1/2 with 402 have 3.08's is the lowest (numerically) gear these trucks had, if you're looking for quicker out of the hole and you're only cruising 55-60, 3.73's would be a better choice. But 3.08's will be better mileage wise, do you have a tach? What kind of rpm's are you turning? __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

01-24-2010, 10:55 PM	#6
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have No tach so no idea my truck was 3 spd on the column and v8 according to Vin (currently 350) __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 10:58 PM	#7
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: what rear end ratio would 72 chevy 1/2 with 402 have It might be worth it to pull your cover and count teeth. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

01-24-2010, 11:13 PM	#8
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have Yeah ought to do that, what'll I need, a new seal? and oil? no tellin what it looks like lol I6 3spd 1/2 ton would have 373 but mines v8 (acoring to vin) but it is a low optioned truck __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 11:19 PM	#9
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have I just got off the phone with the guy a lil ago and he said he wanted $75 for it he'll pull it __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 11:21 PM	#10
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: what rear end ratio would 72 chevy 1/2 with 402 have I don't use a gasket, just sealer, but yes, a gasket and gear oil is all. I'm bettin' you already have 3.73's. But I've been wrong, just ask my wife. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

01-24-2010, 11:28 PM	#11
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have black rtv work? how the heck do you fill it and put cover on without it draining lol and how much oil goes in it 80weight im assumin __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 11:35 PM	#13
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: what rear end ratio would 72 chevy 1/2 with 402 have thats what I thought duno if he'll come down or not...may ask about the cab mine is no good for sure rust everywhere... may have to nab it because its 125 cheaper than everyone elses's 373 lol 3 qt bottles of gear oil (snythetic on the future 5 lug rearend??) i plan on cleaning it up painting it before it goes on. should i replace bearings or brakes or a seal while im at it? __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-24-2010, 11:52 PM	#14
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: what rear end ratio would 72 chevy 1/2 with 402 have might as well. __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

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