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#1 |
67 Chevy Stepside
Join Date: Mar 2007
Location: Jonesville NC
Posts: 836
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3:73 gear to 3:42 gear ?????
can i take a 3:73 posi and put a set of 3:42 gears in it or vice a versus. thanks
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1967 Chevy stepside 1976 BIG DOOLEY 454 turbo 400 4:11 |
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#2 |
glamoros piece o' lowlife
Join Date: Mar 2007
Location: Redford, MI
Posts: 1,164
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Re: 3:73 gear to 3:42 gear ?????
as long as both came off the same type axles (i.e. both are 12-bolts, or both are 10-bolts) the crowns and pinions should swap out just fine
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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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#3 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 3:73 gear to 3:42 gear ?????
Sure you can, but you have to carefull as to whcih carrier you have. There are two different sizes and the difference is how thick the ring gear has to be. I went from a 3.42 gearing to a 3.73 gearing, but I had a smaller carrier size and I had to make sure of the right gear parts. Check in with Randy's ring and Pinion for advice. Just call him, he will tell you what you need to know.
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#4 |
Chris
Join Date: Nov 2004
Location: Monaville, WV
Posts: 3,737
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Re: 3:73 gear to 3:42 gear ?????
I thought as far as carrier seris went it had to be numerically pretty low to have a 2 series, like 2.xx gear ratio, and 3.xx for 3 series.
I'm not sure though, that's basically how it was for the 80's g bodys, I think it's 3.08 and numerically lower was 2 series, and then 3.42 or anything above 3.08 was 3 series.
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Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454 |
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#5 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: 3:73 gear to 3:42 gear ?????
Is it 3.42 or 3.40? I pulled a rearend out of a 74 and it had 10:34 on the ring gear, which works out to 3.40 even, right?
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#6 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 3:73 gear to 3:42 gear ?????
First of all, the breaking point for the carriers is around the 3.42 mark. There were the larger carriers with a 3.42 gear and then there were the smaller carriers with a 3.42 gear on them. The aftermarket makes a 3.73 gear to go into the smaller carrier design and they also have a 3.73 for the larger design. My 12 bolt posi setups in the 84 and the 86 trucks are Eaton units and the carriers are both the smaller design.
My calculations on the ring and pinion makes mine come out to be 3.41556.... or 3.42. |
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#7 |
67 Chevy Stepside
Join Date: Mar 2007
Location: Jonesville NC
Posts: 836
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Re: 3:73 gear to 3:42 gear ?????
the 3;42 is in a 87 chevy truck it says 3;42 on the glove box and the 3:73 came out of a 73-75 and iwas just wondering ig i can put the 342 gears on the 373 rearend they are both 12 bolt thanks
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1967 Chevy stepside 1976 BIG DOOLEY 454 turbo 400 4:11 |
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#8 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: 3:73 gear to 3:42 gear ?????
I think that 3.73 is in either series and you`d be safe going to 3.42s with the same series.
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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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#9 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 3:73 gear to 3:42 gear ?????
I still support that it depends on which carrier unit you have. Maybe you could just swap the whole rearend.
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#10 |
Registered User
Join Date: Feb 2007
Location: Oregon
Posts: 44
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Re: 3:73 gear to 3:42 gear ?????
Question. What would possible donor vehicles be for a complete 3:73 rear swap that will just bolt into an 1984 Stepside? Are the rears on steppers narrower then regular square beds?
Thank in advance for the help! Donny
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Would you rather be eating Government Cheese down by the river, and living in a C-10~! |
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#11 |
67 Chevy Stepside
Join Date: Mar 2007
Location: Jonesville NC
Posts: 836
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Re: 3:73 gear to 3:42 gear ?????
the 373 is a posi and i would rather not have that low of a gear i rather have the 342 on the posi
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1967 Chevy stepside 1976 BIG DOOLEY 454 turbo 400 4:11 |
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