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#1 |
Registered User
Join Date: Jul 2009
Location: grants pass, oregon
Posts: 390
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72, 307, standard what rear end ratio
damn this is a tough seller to deal with. i have to drive 1 1/2 hrs to look at a 72, 1/2 t., 2wd, 307, 3 or 4 sp.? has a floor shifter so its a 4 sp. i cant take off the cover it'll make a mess & almost had an argument with her to walk out back and look at the glove box sticker she finally agreed when i asked her if she really did want to sell this or not geeze! it said "posi-traction rear axle J70" on the sticker. i looked in the faq & did a search but couldnt find anything definite & should be 3:42 or 3:73 i probably wont look at it if i cant find which ratio it is and will not buy it if ultimately cant take off the cover off.
can someone tell me what the J70 is? and if all looks good is it worth the $250 she's asking? thats not what ill offer but she might not budge ty all again
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1990 chevy 4x4 with a 1940 IHC body |
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#2 |
Registered User
![]() Join Date: Jan 2009
Location: marion nc
Posts: 588
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Re: 72, 307, standard what rear end ratio
my guess a 373. i could be wrong, but dont think a 342 was offered till mid 70s maybe early 80s.
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69 short fleet 350/350 "under construction" 70 short step 307/3 speed |
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#3 |
Registered User
Join Date: Aug 2010
Location: Martinsville, VA
Posts: 150
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Re: 72, 307, standard what rear end ratio
I have a 70 1/2 ton 2wd with 307 and 3spd, and mine's 3.73. From what I've read that's the most common ratio with this combo, unless it was special ordered with a lower or higher ratio. Is there any way she would let you jack up the rear and rotate right rear wheel 2 turns and count the revolutions of the driveshaft? That usually gives you an approximate idea of what the ratio is. I know this works on an open diff, not sure if its the same on a posi. Just a thought. The $250 price sounds good to me
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![]() ![]() ![]() 1970 Chevy C10 LWB 307 3OTT 3.73 gear |
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#4 |
Registered User
![]() Join Date: Nov 2010
Location: Venus Texas
Posts: 217
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Re: 72, 307, standard what rear end ratio
The rear axel I bought out of a 71 burb 307 was posi 3:73's. Not sure about the J70, the burb was missing the glove box lid.
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#5 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: 72, 307, standard what rear end ratio
373
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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 |
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#6 |
Senior Member
![]() Join Date: May 2001
Location: Independence MO.
Posts: 7,697
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Re: 72, 307, standard what rear end ratio
Yep, 373
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72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: 72, 307, standard what rear end ratio
The option is the posi,not the ratio. The standard ratio would be 3.73 and an optional ratio would be listed.
J70 is Brake Booster - Hydraulic
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 03-03-2011 at 09:47 AM. |
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#8 |
Registered User
Join Date: Sep 2009
Location: Lafayette, Indiana
Posts: 339
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Re: 72, 307, standard what rear end ratio
Just a little word of warning... Just because the SPID says it's a posi doesn't mean that it still is a posi... When mine came from the factory it had a posi but sometime between then and when I bought it the rear was swapped out for an open diff-ed rear... I suggest if you can jack up the rear and spin the tires to know for sure.
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1969 CST/10 "GreenAndWhite" 1974 Nova (SOLD... End of an Era) 2000 Impala (RIP) 2008 Malibu Brand Loyal... I've never owned a Vehicle not made by Chevrolet. |
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#9 |
Registered User
Join Date: Mar 2008
Location: Salt Lake City UT
Posts: 441
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Re: 72, 307, standard what rear end ratio
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#10 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: 72, 307, standard what rear end ratio
My truck was a 307 three speed on the column and it had 373's when we rebuilt id and installed the auburn unit..
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#11 |
Registered User
Join Date: Jul 2009
Location: grants pass, oregon
Posts: 390
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Re: 72, 307, standard what rear end ratio
thanks all but i got spooked & chickened out the owner would not allow the cover to be removed for inspection the truck was parked out back a few years ago for some unknown reason so i didnt trust the situation it was pay for it then take it, i dont know would you trust this ?
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1990 chevy 4x4 with a 1940 IHC body |
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#12 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: 72, 307, standard what rear end ratio
No,I wouldn't buy a part I wasn't allowed to inspect
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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