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05-06-2010, 03:57 PM
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#1 |
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Registered User
Join Date: Jul 2009
Location: HEB Texas
Posts: 35
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Factory gear ratio's
I have done a search and could not find anything. I have a 1985 swb 2wd 10 bolt that came factory with a 5.0l 305. What did the factory offer for gear ratios? 2.73 or 3.08???????
Last edited by Big Cliff; 05-06-2010 at 03:58 PM. |
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05-06-2010, 04:07 PM
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#2 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Factory gear ratio's
You should be able to use the RPO codes (in the glove box) and figure out what you have, as long as it has not been changed over the years. I believe most common is 3.42. RPO code is probably a G** one for your year model.
http://www.73-87.com/chevy_ids/rpo-eg.htm#rpo-g , easier way is to just link you. Has been a wonderful link for me decoding some stuff. Last edited by RandyP; 05-06-2010 at 04:15 PM. |
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05-06-2010, 04:45 PM
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#3 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Factory gear ratio's
My guess on which ones was the most common would center around 3.08 gearing. There seems to a lot of those rear ends in the salvage yards.
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Frank |
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05-06-2010, 04:57 PM
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#4 |
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Registered User
Join Date: Apr 2010
Location: Newcastle, OK
Posts: 1,344
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Re: Factory gear ratio's
Should the codes on your truck tell you what you have? Only thing is I know the glove box in mine isn't original. Any other way to tell your gearing? Mine has a 12 bolt rear in it.
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05-06-2010, 05:39 PM
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#5 |
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Account Suspended
Join Date: Mar 2010
Location: So. Cal, Inland Empire
Posts: 199
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Re: Factory gear ratio's
I have an 86 SWB with originally a 305 in it and it has 3.08's in the rear.
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05-06-2010, 07:42 PM
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#6 |
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Registered User
Join Date: Apr 2009
Location: Pflugerville, TX
Posts: 594
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Re: Factory gear ratio's
87 LWB, 305 and 3.08s.
It's slow. |
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05-06-2010, 10:24 PM
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#7 |
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Registered User
Join Date: May 2009
Location: Sparks, NV
Posts: 913
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Re: Factory gear ratio's
79 gmc factory 350.... 3.08's :[
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Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__
............._____l __\__ ..............l_(O)_ l___(O)] |
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05-07-2010, 09:46 AM
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#8 |
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Registered User
Join Date: Jul 2009
Location: HEB Texas
Posts: 35
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Re: Factory gear ratio's
Thanks guys, it has the 3.08's. I ordered a set of 3.42's should help it.
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05-07-2010, 11:25 AM
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#9 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Factory gear ratio's
What transmission? tire size? That's a pretty expensive swap to not nail it exactly...
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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. 
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05-07-2010, 12:23 PM
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#10 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Factory gear ratio's
a 700R4 will be spot on after that. The low 1st gear is better, too.
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1974 Jimmy- 5.3/4L80e/NP241 |
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05-07-2010, 12:35 PM
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#11 | |
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Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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Re: Factory gear ratio's
What would a C30 6.2 4 speed have 4.10?
dont have RPO cods or the tag on the rear end
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Thomas Quote:
Last edited by GmtGmt; 05-07-2010 at 12:35 PM. |
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