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05-06-2014, 01:30 AM
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#1 |
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Registered User
Join Date: Sep 2012
Location: Eads CO
Posts: 28
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Trans/ Gear ratio question
Right now I have a 402 (350-400 HP est) in my 72 with a TH350. Im not sure of the gear ratio, cant find out what it is for sure. The top speed right now is only like 65-70 at high rpm. Im looking to get an OD trans and better gears. What are your suggestions? Thanks guys!
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My Fleet: 1968 Mustang,1972 C10, 2002 Lincoln LS  Father and grandfater restored Fleet: 1957 Bel Air 2door convertable, (in progress) 1957 4 door post, (in progress) 1959 Star Chief, 1966 Impala, and many others |
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05-06-2014, 01:36 AM
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#2 |
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Registered User
 
Join Date: Apr 2012
Location: Stillwater, Oklahoma
Posts: 874
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Re: Trans/ Gear ratio question
You probably have 4:11's. Check your SPID in the glove door. You can do a simple check by counting tire revolutions and driveshaft revolutions. Or obviously remove the cover and count the teeth on your gears.
A 4 speed with od will definitely help. Most guys seem to prefer 3:73's with a 700r4 od tranny.
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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05-06-2014, 01:51 AM
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#3 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Trans/ Gear ratio question
Stock ratios are not indicated on the SPID.
If you know what the original powertrain was (it can be read or deduced from the SPID) then just look it up on the powertrain charts I posted. Since the only stock thing we know about your truck is that its a 72, the rest is up to you. * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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05-06-2014, 02:03 AM
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#4 | |
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Registered User
Join Date: Sep 2004
Location: Rancho Santa Margarita - SoCal
Posts: 1,432
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Re: Trans/ Gear ratio question
Quote:
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05-06-2014, 02:13 AM
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#5 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Trans/ Gear ratio question
If you are going to quote me then please check your facts first.
Your truck stock would have been built with 3.07 gears, but since it was ordered with the optional 3.73 gears (RPO H05) they are listed on the SPID.
__________________
Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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05-06-2014, 04:06 AM
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#6 |
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Registered User
Join Date: Sep 2004
Location: Rancho Santa Margarita - SoCal
Posts: 1,432
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Re: Trans/ Gear ratio question
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