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Canadian Poncho Homepage -> Canadian Poncho -> 58-64 Full Size Power Train Tech Forum -> 61 pontiac rear end ratio ?
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carbuff2007


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61 pontiac rear end ratio ?
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This past winter put a 305 with a 2 speed PG, As there was a six in it originally it has 355 gears in it. I like to cruise around 60mph but tach is running around 2600rpm, at 50mph tach is 2200rpm, if I went to a 3:36 how much rpms could I drop at 60mph? I was thinking of 3:08's but with only a 2 speed trans think it might me to low on the get go. Any suggestions would help. thanks brent



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rabbit64cs


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http://www.csgnetwork.com/multirpmcalc.html



-- Edited by rabbit64cs on Sunday 10th of July 2011 06:04:32 PM

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later...rog

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OURWAGON


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2200 AT 50 MPH IS NOT VERY HIGH ???



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dualquadpete


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Maybe "Carbuff" is comparing it to newer "daily" driver w/OD trans. My 2010 Suburban w/3.08's & 6 spd. O/D cruises at 1650 RPM at 70 MPH. 64 Catalina w/ 2.67's & a turbo 350 trans. is turning around 2500 at same speed. Catalina is more "fun' to drive when it "squaks" the tires in 2nd. on acelleration, [ the burb won't ]

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carbuff2007


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Yes guess we are so used to the new vehicles idling at 70mph that now it seems that the older cars sound like the engine is overreving, I like ur setup Pete, I could handle 2500rpm at 70mph. I have a 700R4 casing in the garage, maybe that would work and leave the 3:55"s in. Any thoughts?

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73SC


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dualquadpete wrote:

 Catalina is more "fun' to drive when it "squaks" the tires in 2nd. on acelleration, [ the burb won't ]

Whats wrong with the Suburban confuse Mine fries tires.



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dualquadpete


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73SC wrote:
dualquadpete wrote:

 Catalina is more "fun' to drive when it "squaks" the tires in 2nd. on acelleration, [ the burb won't ]

Whats wrong with the Suburban confuse Mine fries tires.

 Ray, it will on take off,goes up in smoke but won't spin them on shifting into 2nd. The Catalina will do about 20' in 2nd gear & used to 'chirp" into 3rd. with the 3:42's out back!!!!  I'm amazed the old Cat. will spin em with the 2"67's just has "bags" of torque & tranny is "beefed" a little bit!!!



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rabbit64cs


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dualquadpete wrote:
73SC wrote:
dualquadpete wrote:

 Catalina is more "fun' to drive when it "squaks" the tires in 2nd. on acelleration, [ the burb won't ]

Whats wrong with the Suburban confuse Mine fries tires.

 Ray, it will on take off,goes up in smoke but won't spin them on shifting into 2nd. The Catalina will do about 20' in 2nd gear & used to 'chirp" into 3rd. with the 3:42's out back!!!!  I'm amazed the old Cat. will spin em with the 2"67's just has "bags" of torque & tranny is "beefed" a little bit!!!

 THAT's  American PONTIAC bottom end torque !!!



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