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04-11-2007, 10:42 PM
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#1 |
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Registered User
Join Date: Dec 2006
Location: washington state
Posts: 144
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Ring & pinion issues
I'm looking for suggestions or comments.. Thanks..
The story: Purchased a 67 3/4 ton, th400, Eaton rear, 32" commercial truck tireson 16 " rims, Drum brakes- 8 lug,,, Truck was carrying an Alaskan POPup camper ( approx 1600lbs ). i had wanted to ditch the tall tires to rid myself of the tire 'wine' on the freeway..... I sold the camper to pay for a disc brake/ power booster set up, Then added drop spindles & coils. Found a great set 8 lug- 17" Weld Conehead wheels, added a set of Continental radials- only the tires are 28" tall. Question - did GM offer other diff. that were 8-lug but w' taller gearing, I must have 4:10 gears. any help or suggestions please.. Thanks, jim YIKEs ,, -Sorry I mis typed, I was so rattled on my new dilemma -thanks for the 'heads up-'IvanD..
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1941 Chevy 1/2 ton Street Rod: 327 cu,/350 auto, 'Stinger ' - JULY 2007 CUSTOM CLASSIC TRUCK magazine. 1967 Chevy 3/4 ton standard bed, 350 cu./400 auto, w/ 83 - 3:43 rear end...sips gas.... Last edited by fourty1; 04-12-2007 at 11:24 AM. |
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04-11-2007, 11:09 PM
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#2 |
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Flat Black, & Chrome!
Join Date: Jan 2007
Location: San Francisco
Posts: 852
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Re: Rack & pinion issues
Are you in the right subforum here? Nice lookin truck btw!
Last edited by Rc 415; 04-12-2007 at 12:05 AM. |
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04-11-2007, 11:32 PM
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#3 |
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Registered User
Join Date: Dec 2006
Location: washington state
Posts: 144
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Re: Rack & pinion issues
Sorry, I hoped there were some 3/4 drivers here. Not sure if the 73-83 came with spring or coils....and if there were any similar issues..
thanks Rc415 jim
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1941 Chevy 1/2 ton Street Rod: 327 cu,/350 auto, 'Stinger ' - JULY 2007 CUSTOM CLASSIC TRUCK magazine. 1967 Chevy 3/4 ton standard bed, 350 cu./400 auto, w/ 83 - 3:43 rear end...sips gas.... |
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04-12-2007, 12:08 AM
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#4 |
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Flat Black, & Chrome!
Join Date: Jan 2007
Location: San Francisco
Posts: 852
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Re: Rack & pinion issues
On the back they have leaf spring, and up front they have springs, for 2wd anyway. Thats about all I know.
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04-12-2007, 08:58 AM
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#5 |
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Happy to be here
 
Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,021
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Re: Rack & pinion issues
fourty1 welcome to the 73-87 forum. This generation of trucks came with 4.10, 3.90, 3.73, 3.42, 3.08 and higher. The problem with looking at a 73-87 rear end might be the width. I know some of the 67 to 69(?) had a different width rear axle. You need to verify the width of your axle before considering a later generation conversion.
BTW- I saw what a steal you got on your wheels. I need to take you with me when I shop. The truck turned out awesome.... 
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Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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04-12-2007, 10:38 AM
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#6 |
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glamoros piece o' lowlife
Join Date: Mar 2007
Location: Redford, MI
Posts: 1,164
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Re: Rack & pinion issues
Jim, yer thread should be titled "ring and pinion issues" as rack and pinion is something completely different and refers to steering systems. Anyhow, on yer question - you only need to swap the gears in yer rear end, no need to swap the complete differential or the whole rear axle. I believe the 8-lug 3/4 axles are the so-called "14-bolt semi-floater", which use 9.5" ring gear and have left the factory with 4.11 gear ratios. You might also have the 8.875" ring gear (12-bolt axle), tho I kinda doubt it, but even if you do have that there are 4.11 gears for it too. Really, look up yer build sheet (should be in the glove box), find the RPO code for the axle, and look it up here - there are also pictures and info on different GM axles on this website, which will help you identify what you have, so use them and report back with yer findings.
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The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express |
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