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12-03-2016, 10:47 PM
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#1
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,133
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Gears and converter question
Building a 355 for my wife's 86 trans am that she blew up, the kit Im using is calling for a 3000 stall. Most converters I see are 3000-3500 stall speed, the rear has some pretty tall gears, I believe that they are 2:73. I plan on swapping the rear with a stock 10 bolt with 3:42 gears from a formula parts car that I have. What effect will either sets of gears have on the stall speed of the converter. What would happen if I just used the stock converter? I plan on t56 swapping it later on just want the car to run decent, not going to be raced much if at all.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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12-05-2016, 08:41 PM
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#2
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
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If there's a larger cam, it may push with a stock converter.
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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12-05-2016, 09:24 PM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Steeper gears will load the converter a lot more than proper gears would.
Whats your redline and where is peak HP predicted?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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12-06-2016, 06:19 PM
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#4
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,133
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Motor is a 10:1 355 with an edelbrock top end kit max rpm is 6500 so im assuming that the peak would be close maybe 6000-6200. Im not looking for fastest times or anything just trying to make a decent driving car, it will hardly be raced. Dont want to swap the motor then have it be un-driveable because of the stock converter and gears.
http://www.jegs.com/i/Edelbrock/350/2098/10002/-1
Cam Spec
http://www.jegs.com/i/JEGS+Performan.../7102/10002/-1
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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12-07-2016, 06:40 PM
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#5
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,650
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Honestly? Run a smaller cam. You'll be happier with the way it drives on the street. Consider a hydraulic roller if it's in the budget; less chances of issues with lobe wiping with the currently available engine oil.
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1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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Last edited by The_Bishop; 12-07-2016 at 06:42 PM.
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12-07-2016, 07:26 PM
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#6
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by The_Bishop
Honestly? Run a smaller cam. You'll be happier with the way it drives on the street. Consider a hydraulic roller if it's in the budget; less chances of issues with lobe wiping with the currently available engine oil.
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Unless he owns it already, yeah. The Edelbrock grinds have been "old" for a while as well.
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12-07-2016, 07:53 PM
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#7
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,133
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Quote:
Originally Posted by WildBillyT
Unless he owns it already, yeah. The Edelbrock grinds have been "old" for a while as well.
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It came as a complete kit, it works. This motor is just to get the car running hold her over until I can tackle the ls1/t56 swap.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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12-07-2016, 07:54 PM
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#8
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,133
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Quote:
Originally Posted by The_Bishop
Honestly? Run a smaller cam. You'll be happier with the way it drives on the street. Consider a hydraulic roller if it's in the budget; less chances of issues with lobe wiping with the currently available engine oil.
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Its a weekend driver, just want it to be fun to hold her over. Ill run the proper oil needed for the flat tappet cam.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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12-08-2016, 08:49 PM
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#9
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,153
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Quote:
Originally Posted by B4C
Its a weekend driver, just want it to be fun to hold her over. Ill run the proper oil needed for the flat tappet cam.
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Amsoil Z-rod, after break in of course.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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12-08-2016, 08:50 PM
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#10
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by BonzoHansen
Amsoil Z-rod, after break in of course.
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Any reason why you prefer that over VR1?
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12-08-2016, 09:10 PM
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#11
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,153
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Quote:
Originally Posted by WildBillyT
Any reason why you prefer that over VR1?
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No real reason other than I know the amsoil is designed specifically for flat tappet street cars. although I am not sure racing specific oil had the right additive packs for a street car. I remember reading something a few years ago but I don't remember anymore. Plus VR1 is non-synth I think.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
Last edited by BonzoHansen; 12-08-2016 at 09:12 PM.
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12-09-2016, 08:16 PM
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#12
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,650
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Here's the thing:
If he's stuck running the stock converter and gears with the motor as is, it'll drive like crap. Won't idle worth a damn, no vacuum for brakes, pushing at idle, etc.
If there's no budget for a converter and gear swap, a different cam is a cheaper alternative to keep the car driveable and fun.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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12-18-2016, 07:36 PM
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#13
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,133
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Picked up a tci 3000-3500 stall with lockup. Only thing left is to swap the engine...
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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