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06-17-2010, 12:05 AM
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#1 |
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Registered User
Join Date: Oct 2009
Location: Mesa, AZ
Posts: 17
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Low rearend gearing with a granny gear trans
Has anyone ever looked into running a real low gear ratio in the rear end so the the granny gear functions as a real 1st gear and the top gear would be an overdrive??
Is this possible? |
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06-17-2010, 12:45 AM
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#2 |
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Registered User
Join Date: Feb 2008
Location: pooler, GA
Posts: 213
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Re: Low rearend gearing with a granny gear trans
It would work but you would have to run a real high 2:?? or low 3:?? to get there. That also means changing out your carrier to take that high of gear.
__________________
66 short wide fleet sbw = Gave to my best friend 66 short wide fleet bbw |
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06-17-2010, 01:32 AM
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#3 | |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Low rearend gearing with a granny gear trans
The one problem with that is I don't believe there is a synchro on 2nd gear, so it will grind everytime you shift from 1st to 2nd. I could be wrong though....
Quote:
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06-17-2010, 04:48 AM
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#4 |
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Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Low rearend gearing with a granny gear trans
Second gear is synchro on the SM420, so no problem shifting on the fly. Actually, you won't be using first gear very much anyway, even with the taller rear gearing. Second on the SM420 is lower than first on the 3 speed.
Ray |
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06-17-2010, 10:48 PM
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#5 | |
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60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Low rearend gearing with a granny gear trans
What about in the SM465?
Quote:
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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06-17-2010, 11:07 PM
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#6 |
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Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Low rearend gearing with a granny gear trans
Second and third are roughly the same on the 420 and 465 (about 3.5 and 1.7 respectively). First is slightly taller on the 465 (about 6.5 vs 7.0). I have a page bookmarked somewhere with the actual ratios and if I can find it I will post it.
Ray Last edited by raycow; 06-17-2010 at 11:07 PM. |
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06-17-2010, 11:31 PM
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#7 |
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Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Low rearend gearing with a granny gear trans
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06-17-2010, 11:36 PM
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#8 |
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60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Low rearend gearing with a granny gear trans
Is 2nd gear on the SM465 synchro'd the same as the SM420?
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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06-18-2010, 12:05 AM
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#9 |
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Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Low rearend gearing with a granny gear trans
Yes, the 465 has synchro on 2nd. Sorry, I didn't realize that was what you were asking about the first time.
Ray Last edited by raycow; 06-18-2010 at 12:09 AM. |
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