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09-20-2011, 09:17 PM
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#1 |
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Registered User
Join Date: Nov 2009
Location: GA/AL
Posts: 290
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rearend gears for new motor setup
ive been thinking about buying the jegs supercharged 350 engine and was wondering what gears would be best for this engine. im will run a th350 trans.
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1965 c10 short stepside  (dad's project)1967 c10 fleetside 350/350 trans (my baby) |
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09-21-2011, 06:53 AM
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#2 |
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Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,892
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Re: rearend gears for new motor setup
How much street use and how much track use? Any interstate travel or just back roads?
__________________
Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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09-21-2011, 07:20 PM
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#3 |
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Registered User
Join Date: Nov 2009
Location: GA/AL
Posts: 290
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Re: rearend gears for new motor setup
ahh mostly street, some hwy driving because i will take it to shows, but dont get me wrong; i love going to the strip
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1965 c10 short stepside (dad's project)1967 c10 fleetside 350/350 trans (my baby) |
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09-21-2011, 09:11 PM
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#4 |
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Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: rearend gears for new motor setup
not too much and not to less..... 4:10 maybe
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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09-21-2011, 11:14 PM
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#5 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: rearend gears for new motor setup
How big of a tire you planning on running?
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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09-22-2011, 05:27 PM
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#6 |
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Registered User
Join Date: Nov 2009
Location: GA/AL
Posts: 290
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Re: rearend gears for new motor setup
wanting to stay around a 28" tire. im going to run 20's
__________________
1965 c10 short stepside (dad's project)1967 c10 fleetside 350/350 trans (my baby) |
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09-22-2011, 07:43 PM
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#7 |
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Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,892
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Re: rearend gears for new motor setup
I would say 3.73 with the 28 tire.
__________________
Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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09-22-2011, 08:32 PM
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#8 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: rearend gears for new motor setup
I'm with Kevin. A blower motor makes an ungawdly amounf of torque without having to 'spin her up'. I think a 3.43 or 3.73 gear would work well for what you describe especially with the highway driving involved.
Let's just play with the numbers a bit 3.73:1 gear, 28" tall tire, TH350, 65mph = 2900rpm with no accounting for loss through the converter. Cruising it should be minimal if you run like a 2400 stall. 3.43:1 with all the same will drop rpm to 2675 at 65mph. (3350rpm at 75 for the 3.73's and 3100 for the 3.43's) TRADE OFF: Let's assume you go to the track and run 12's at 115 (agressive, but boost may surprise everyone) 3.43 gears would have you crossing at only 4700rpm, 3.73's at 5150rpm. A 4.56 gear will work MUCH better at the track (crossing around 6300, BUT 75 on the freeway it will spin a bearing scorching 4100rpm at 75mph. Tough choice eh! a well built 4L80 would solve all your problems 
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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09-24-2011, 06:27 PM
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#9 |
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Registered User
Join Date: Nov 2009
Location: GA/AL
Posts: 290
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Re: rearend gears for new motor setup
thanks marv, im trying to come up with a truck that i can show and have a blast in. the only reason im planning on a blown motor is because its somthing different
__________________
1965 c10 short stepside (dad's project)1967 c10 fleetside 350/350 trans (my baby) |
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09-24-2011, 07:44 PM
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#10 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: rearend gears for new motor setup
I totally understand speed. That's why I race with N/A small blocks and door cars. Anybody can put a pile of pipe in the 8's with no motor at all, and anyone can put a door car in the 10's with a big block. Low 9's in a steel door car with a n/a small block is not that common. (and stupid from a econoimics view,, but different LOL)
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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