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06-06-2012, 10:42 AM
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#1 |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Posi rearend question
I have a 69 12 bolt that I am going to be putting new bearings and seals in. I figured why I'm in there I might as well put an Eaton posi in. I will be running a 275/60/15 tire in the rear and a 350th with a 5000 stall converter. The truck originally had a 250 6cyl and manual 3spd with 225/70/15 tire in the rear
My question is what gear should I run for highway/street use. This truck is a weekend warrior that will be driven to shows. |
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06-06-2012, 11:08 AM
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#2 | |
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Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Posi rearend question
Quote:
http://youtu.be/npwEOmpPC4s 
Last edited by hjewell2; 06-06-2012 at 11:10 AM. Reason: change |
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06-06-2012, 12:31 PM
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#3 |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Re: Posi rearend question
I'm not sure I want to do 4:11 for street or highway use. I was thinking 3:73 or lower.. This truck will probably never see a drag strip.
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06-06-2012, 12:34 PM
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#4 |
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Registered User
Join Date: Jun 2010
Location: British Columbia
Posts: 192
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Re: Posi rearend question
Why such a high stall if your just running on the street and highway. Just asking.
__________________
If you can't impress them with your inteligence, dazzle'm with your stupidity 1969 GMC lwb 2wheel drive can you say big stroker motor to come hehe |
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06-06-2012, 12:46 PM
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#5 |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Re: Posi rearend question
I didn't put the motor/trans together (not really my strong point) I'm told that what was put in it.. I may be wrong. I will ask about it.
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06-06-2012, 12:51 PM
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#6 |
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Registered User
Join Date: Jun 2010
Location: British Columbia
Posts: 192
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Re: Posi rearend question
Ya I'm no tranny expert either haha but a 5000 is pretty tall I think. It would probably cook it self on long highway drives. Maybe I'm wrong but just from what I read it seems to make sense.
__________________
If you can't impress them with your inteligence, dazzle'm with your stupidity 1969 GMC lwb 2wheel drive can you say big stroker motor to come hehe |
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06-06-2012, 01:46 PM
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#7 |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Re: Posi rearend question
LOL!! OMG!! My stall number was way off!!! I just called the guys that built my trans, 1800-2200 stall. I discussed what gears I should run and it was agreed that a 3:55 would probably be best for street/highway use with a 275/60/15
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06-06-2012, 02:30 PM
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#8 |
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Registered User
Join Date: Mar 2011
Location: Fort St John, BC
Posts: 85
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Re: Posi rearend question
3.55 would rock, i have 3.73 with a TH400 and love it but if you do any amount of highway 3.55 would be great.
What gears do you have now? If im not way off I think the 250 6cyl had 3.73 or 4.11 originaly?
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69 c10 lwb |
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06-06-2012, 02:40 PM
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#9 | |
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Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Posi rearend question
Quote:
http://www.wallaceracing.com/Calculators.htm |
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06-06-2012, 03:00 PM
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#10 |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Re: Posi rearend question
Wow.. So I just looked up an Eaton posi, 3:55 ring and pinion, and install kit and it came to over $800 through Summit Racing. Anyone know of anything cheaper..
However, I just found a complete kit on Ebay for $645 with free shipping Last edited by Rochlow; 06-06-2012 at 03:20 PM. |
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06-06-2012, 03:13 PM
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#11 |
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Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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Re: Posi rearend question
Im running TH400, 411 posi and 3000 stall hughs converter I love it. I want to install A 700R4 but in time. Not A daily driver.
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"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES" 
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06-06-2012, 03:24 PM
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#12 | |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 20,031
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Re: Posi rearend question
Quote:
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul |
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06-06-2012, 03:46 PM
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#13 |
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Registered User
Join Date: May 2012
Location: Ingersoll, Ontario
Posts: 93
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Re: Posi rearend question
I run the same size tire and about the same stall with a 3.73 gear and a 700r4. In OD with the converter locked it runs 1500-1800 rpm. I'll see what it runs in third next time I'm on the highway. A 3.73 should keep your cruising RPM up above or close to your stall rpm but it's a matter of preference.
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06-06-2012, 03:49 PM
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#14 | |
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Registered User
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
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Re: Posi rearend question
Quote:
This is the one I was thinking about. I'm going to research a bit more before I make the leap. Thanks for all the help guys, Greatly apperciated. Last edited by Rochlow; 06-06-2012 at 03:58 PM. |
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06-06-2012, 04:53 PM
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#15 |
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Registered User
Join Date: Mar 2011
Location: Fort St John, BC
Posts: 85
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Re: Posi rearend question
I bought my 3.73 eaton posi off ebay from this guy
Brydon R. Papenberg <staticz2229@gmail.com> Great service from him and his company. I think if you look up his email up on ebay
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69 c10 lwb |
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06-06-2012, 06:28 PM
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#16 | |
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Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Posi rearend question
Quote:
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