![]() |
|
![]() |
#1 |
Registered User
Join Date: Jul 2010
Location: Detroit, Michigan
Posts: 31
|
Gear Ratio ???
Does anyone know what the "standard gear ratio" is for an 81 2WD 6cyl 3SPD manual? The RPO Description for GQ1 says..... REAR AXLE - STANDARD. I don't want to pull the diff cover if I don't have to. Does anyone else have this combo & know what gear they have?? Any help would be great! Thanks.
|
![]() |
![]() |
![]() |
#2 |
Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
|
Re: Gear Ratio ???
No other RPO codes that start with G on the label?
__________________
Why is every used 350 sbc out of a corvette? There's only two things that excite a man, expensive toys and real expensive toys. VEGETARIAN: That's an old Indian word meaning "I don't hunt so good." When the going gets tough, switch to power tools. |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Jul 2010
Location: Detroit, Michigan
Posts: 31
|
Re: Gear Ratio ???
G50...HD rear springs. Thats the only other G code.
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Dec 2010
Location: Burleson, Texas
Posts: 596
|
Re: Gear Ratio ???
Why not just count??
Raise the rear, place in neutral, chock one tire (if non posi), rotate the free tire one full rotation while watching the driveshaft yoke. (mulitply this # by 2 if non posi) With out making a degree wheel, there is a little guess work invovled in how far around the driveshaft turns, but this will get you close...
__________________
Allengator Outta the Blue (my band - available for hire in the DFW area!) 1980 Chevy SWB Pickup (build thread) 1951 Chevy Sedan Delivery 2004 Chevy Tahoe Z71 2011 Harley Davidson Street Glide 2018 Silverado Z71 Crew Cab |
![]() |
![]() |
![]() |
#5 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
|
Re: Gear Ratio ???
Why not just pull the cover off and be sure? Then you can confirm the condition of the other internals and change the fluid too. The rear end is one of the most abused/ignored parts of any vehicle. That could very-well be the factory lube in there.....it's 30 years old, give it a break.
__________________
You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Dec 2010
Location: sioux city, iowa
Posts: 619
|
Re: Gear Ratio ???
Just download the cheatcode.
|
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Jul 2010
Location: Detroit, Michigan
Posts: 31
|
Re: Gear Ratio ???
I will end up pulling the diff. cover, I just wanted to see if anyone had this combo or knew what the standard gear was. One more thing.....
I've been searching the site & found i can run stock front shocks on the rear of my lowered truck? I have a flip kit on the rear with no "c" notch, I think it still has the stock legnth shocks on it & there bottomed out. I got this truck this past summer & liked it so much I drove the **** out of it all summer. Now I want to change a few things. |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Dec 2010
Location: Visalia, Ca
Posts: 707
|
Re: Gear Ratio ???
I believe it would be 2.73 by this
__________________
<Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works. ![]() 1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195 |
![]() |
![]() |
![]() |
#9 | |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
|
Re: Gear Ratio ???
Quote:
Regarding the "standard" gear ratio, all this is "assuming" the stock rear axle is still in place. Pull the cover as LONGHAIR suggested, and know for sure what you have in there.
__________________
Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" Last edited by N2TRUX; 12-29-2010 at 11:56 AM. |
|
![]() |
![]() |
![]() |
#10 | |
Account Suspended
![]() Join Date: Dec 2008
Location: Huntsville,AL
Posts: 2,119
|
Re: Gear Ratio ???
Quote:
DJM Suspension Deluxe Flip Kit - 5" includes Flip Brackets Lower Shock Extenders Bump Stops Installation Hardware & Instructions |
|
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Jul 2010
Location: Detroit, Michigan
Posts: 31
|
Re: Gear Ratio ???
Thanks for the replies everyone. I would bet I've got 2.73's in the rear, it was a 6cyl 3spd... & now it's a 350 with a 4 spd. It gets pretty good gas mileage which I like but it only does a one wheel peel. I might put a locker in there since I don't drive it in the winter or on rainy days. It's just a summer ride.
QUOTE: Leaving stock shocks on your lowered vehicle results in poor handling, bone jarring ride, and limited shock life. This I know all to well!!! The truck rides like a brick in the rear! I was thinking about fabbing up some shock extenders. Anyone know about how long the extenders are? |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Apr 2009
Location: Centreville, Virginia
Posts: 846
|
Re: Gear Ratio ???
I think I will end up doing the same since my 82' came with a 6 banger and a TH350 as std. from the plant. I have a feeling I will need to change the gears with my new drive train set up
__________________
The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold) |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Nov 2009
Location: Sonora California
Posts: 860
|
Re: Gear Ratio ???
My 79, 6 cyl automatic has 3:42s. A little low for my liking but I'm thinking of going to a 700r4. I have another rear end, i'm thinking 3:08s as it was from an 84 v8 model. time will tell what changes will take place.
|
![]() |
![]() |
![]() |
#14 |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
|
Re: Gear Ratio ???
For 81, The 6 cylinders got 2.73 as std axle ratio. GQ1
The 8's got 2.56 GQ1 Unless it's a california truck; In that case 6 cylinders got 3.08 as the std axle ratio code GQ1 and 8's got 2.73. i went thru this dilema yrs ago when i first got my truck. Also, if you bring your vin# to any decent gm dealer they can type it in and tell you exactly what gear ratio came with the truck originally. Last edited by C-10 simplex; 12-29-2010 at 06:34 PM. |
![]() |
![]() |
![]() |
#15 | |
Registered User
Join Date: Apr 2009
Location: Centreville, Virginia
Posts: 846
|
Re: Gear Ratio ???
Quote:
__________________
The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold) |
|
![]() |
![]() |
![]() |
#16 |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
|
Re: Gear Ratio ???
Oh S
i screwed up i think? Std gear ratio is ALSO dependent on the GVWR of your truck. Will report back in detail after i wake up. Sorry. |
![]() |
![]() |
![]() |
#17 | |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
|
Re: Gear Ratio ???
Quote:
NOTE: i'm not really that good with drivetrain combos so..... 2) As far as recommendations i'm struggling with that myself because i want to tow about no more than 5000lbs but only occasionally so this right there means i don't want to go too low because i'll spend most of the time commuting not towing. But i can't go too high because trying to tow 5000lbs with 2.56 would put too much strain on the engine if i use a "smaller" engine i'm thinking. On top of that to confuse the issue further i'm not sure if i want to use a 383/400 really good for towing not so good on gas. Or a 6.2 diesel or 305 better on mpg, but less power. What are you planning on using your truck for? The other thing, i'm thinking is 4th gear on a muncieM20 1:1? And what ratios are the first 3 gears? Last edited by C-10 simplex; 12-30-2010 at 05:51 PM. |
|
![]() |
![]() |
![]() |
#18 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
|
Re: Gear Ratio ???
I recently parted out a 6 cylinder 3 speed column shift truck. I could hardly believe it, but it did have 2.73 gears in it. I confirmed with the original owner (1 owner truck) that the rearend was unaltered.
Talk about a putrid combination. Six in a row, column shift and long leg rearend. I'm surprised anyone would buy one after a test drive.
__________________
I'm on the Instagram- @Gearhead_Kevin |
![]() |
![]() |
![]() |
#19 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
|
Re: Gear Ratio ???
Early 80s truck were just as bad...or worse. Imagine a 305 with a 700r4 and 2.56 gears. At least the lower 1st gear would get it going, but the OD was totally useless and the thing is a total dud. Now put that in a 4x4 with taller tires and it's worse yet...
__________________
You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
|
![]() |
![]() |
![]() |
#20 |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
|
Re: Gear Ratio ???
Ok, all awake now--i work 3rd shift/night shift unfortunately hence the need to sleep during the day.
Also, i'm sorry---i rushed thru my notes and didn't list properly all the info: In addition to the eng/trans combo you also need to know your GVWR rating which is printed on the certification label which should be on the drivers door jam. So, 2nd try, In 81: If you have a 6 cyl and your GVWR is 4900 lbs., AND you're 2WD your std axle ratio GQ1 is 2.73 regardless of which trans you got----3sp, 4sp, or auto. If you have a 6 cyl and your GVWR is 5200 lbs. AND you're 2WD, your std axle ratio GQ1 is still 2.73 regardless of which trans you got---3sp, 4 sp, or auto. Everything same as above and your GVWR is 5600 lbs. you still got 2.73 Now if the GVWR is 6100 lbs. (6100 lbs. in a 6 cyl truck wow ![]() NOTE: i think it is because if this very reason is why GQ1 was never assigned a set number? If the GVWR is 6100 lbs. and you got a 6cyl and you got a 4spd or auto, then the std axle ratio GQ1 is 2.73. Now for 1/2 ton trucks with small block, not big block 8 cyls and 2WD: If you have GVWR of 4900 AND a 3sp or 4sp, then GQ1=2.73 If you have GVWR of 4900 AND an automatic, then GQ1=2.56 If you have GVWR of 5200 AND a 3sp or 4sp, then GQ1=2.73 If you have GVWR of 5200 AND an automatic, then GQ1=2.56 5600lbs and 2bbl engine (check your vin#) and 3spd, then GQ1=3.08 5600lbs and 2bbl engine and automagic trans, then GQ1=2.73 5600 lbs and 4bbl engine and 3spd, then GQ1=3.08 5600 lbs and 4bbl engine and 4spd, then GQ1=2.73 5600 lbs and 4bbl engine and automagic, then GQ1=2.56 6100 lbs and 2bbl engine and 3sp, then GQ1=3.08 6100 lbs and 2bbl engine and automagic, then GQ1=2.73 6100 lbs and 4bbl engine and 3sp then GQ1=3.08 6100 lbs and 4bbl engine and 4sp then GQ1=2.73 6100 lbs and 4bbl engine and automagic, then GQ1=2.56 Whew! Again, sorry---i rushed thru my notes and didn't see all the minute details. Possible conclusions: 1) GQ1 was never assigned a set number because std axle ratio depends on alot of factors? 2) i think if one really wants to know what ratio they got is to bring the vin# to the dealer, they can type it in and tell you exactly which gear came with the truck and then to absolutely verify take the diff cover off and physically count the teeth on the ring and pinion; The oil probably could use a changing anyways. Last edited by C-10 simplex; 12-30-2010 at 05:55 PM. |
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: May 2010
Location: ambler, pa
Posts: 325
|
Re: Gear Ratio ???
Not to even remotly try to hijack this thread but where do the early 350 diesels play into this? Would the basic small block application apply here? I just picked up a free 12 bolt from a diesel but havent had the time to check the ratio yet and would definitly like to get rid of my 2.73's
__________________
Just would like the snow to stop so I can actually work on my truck!!!!!!!!!!! Last edited by gregg72340; 12-30-2010 at 06:27 PM. |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|