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04-10-2012, 09:43 AM
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#1 |
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Registered User
Join Date: Jun 2010
Location: Auburn,Ky
Posts: 69
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Rearend ratio and stall?
71 c10 weekend cruiser/highway NO drag strip with a 468 bbc and built th350 tarnny. Looking for some advice on what stall and if I need to change the rear gear I'm pretty sure (will know soon) the truck has 3.08 gears just wondering if I should change to a lower gear when I install the eaton posi? I am running a 30 inch rear tire also... Here are some specs...
Edelbrock Performer RPM intake, 1" spacer, HEI distributor, MSD plug wires, fully rebuilt heads with new valve springs, new seals,10 degree locks, retainers and lash caps, stainless steel valves (2.25I 1.88E), full roller rockers, JoMar stud girdles, new Comp Cams xm 278h-565 lift-234/244 dur @ .50 , forged SpeedPro pistons, ARP main studs, new rings, flowtech headers. ALL suggestions/advice wanted!!!...Thanks |
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04-10-2012, 12:05 PM
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#2 |
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Registered User
Join Date: Nov 2008
Location: Italy
Posts: 1,278
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Re: Rearend ratio and stall?
I'll bet it makes some damn good torque. That said you could probably get away with a moderate stall. Something like 2300 with 3:73 gears.
That's just my "somewhat educated" guess. I have a 383ci/700r4 with 520 lift 244/244 cam with 2k stall and 4:11s. It makes a good torque down low so I was able to run the lower stall.
__________________
'68 C-10 SWB 383 Stroker (Sold 3/2/2013) '87 R2500 LWB 454 TBI converted to Carb 
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04-10-2012, 12:26 PM
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#3 |
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Registered User
 
Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,212
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Re: Rearend ratio and stall?
I'd stall it about 2500-3000, 3:55 gears. (more for freeway) 3:73 would get more 'punch' off the line yes, but then traction comes into play, .. more stressful on Ujoints, Etc. Just my .02. If Eaton makes something between 3:73 and 3:55 (?) That might be the ticket.
Do you have stock axles in the truck?
__________________
Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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04-10-2012, 01:13 PM
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#4 |
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Registered User
Join Date: Jun 2010
Location: Auburn,Ky
Posts: 69
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Re: Rearend ratio and stall?
Yes I have stock axles..
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04-10-2012, 09:20 PM
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#5 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Rearend ratio and stall?
I'd leave the 3.08's for a street cruiser.It might not jump the lights as quick but witth the 1:1 final drive ratio,you will still be able to run 65 or so on the hiway with out twisting it's tail.
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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04-11-2012, 12:24 AM
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#6 |
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Registered User
Join Date: Jan 2011
Location: Prescott AZ
Posts: 112
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Re: Rearend ratio and stall?
One thing you have to consider with a stall is cruising RPM. Your stall HAS to be lower than your cruise RPM by at least 400 unless your running a lockup converter/trans. More info on your engine combo would help greatly in recommending the proper stall/gear. Without knowing your heads flow numbers it's hard to judge hp/tq curves, also weight of the truck as it will normally cruise will help.
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