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#26 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
Here is a 70 C10 power team chart for you. It really helps to post what year and series you have when asking a question like this.
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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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#27 |
Registered User
Join Date: Dec 2012
Location: Dorr MI
Posts: 176
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Re: Stock rear gear ratio info
Thanks Tim, but yes it is a 1970 C10. I didnt know if mine had a different ratio than 3.07 because at 75mph the truck runs at about 3800rpms or so. I do have a built TH350 and 2200 stall converter however so that is probably part of the higher rpms.
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#28 | |
Registered User
Join Date: Jul 2013
Location: Moro, Illinois
Posts: 7
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Re: Stock rear gear ratio info
Quote:
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#29 | |
Registered User
Join Date: Oct 2010
Location: Sag Harbor NY
Posts: 103
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Re: Stock rear gear ratio info
Quote:
I have a burb that was a 6cyl 4spd and a pickup with 327 240hp 4spd They both have the 10 bolt rear. The truck screams in 4th gear at 50mph Thanks
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1985 Custom Deluxe long bed 305 3 on tree 2015 Silverado "Great White"1987 K20 dump and plow 1968 K20 327 long bed 4spd big blue 68K20 SuburPan 4spd 79C30 L96 6L90e 86 K10 plow |
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#30 | |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
Quote:
All you needed to do was click on the link in my signature, most are there. http://67-72chevytrucks.com/vboard/s...05&postcount=5 4.57 gears spinning a 31" (stock 7-17.5)tire @ 50 mph = about 2475 rpm, that isn't exactly screaming. The indirect drive T-221 t-cases were never quiet.
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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 Last edited by SS Tim; 09-13-2016 at 07:50 PM. |
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#31 |
Registered User
Join Date: Oct 2010
Location: Sag Harbor NY
Posts: 103
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Re: Stock rear gear ratio info
Thanks, I found the link right after I posted. So the T221 makes that jet sound normally? It starts whining at 40 and close to 50 I need ear protection.
__________________
1985 Custom Deluxe long bed 305 3 on tree 2015 Silverado "Great White"1987 K20 dump and plow 1968 K20 327 long bed 4spd big blue 68K20 SuburPan 4spd 79C30 L96 6L90e 86 K10 plow |
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#32 | |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
Quote:
Have replacement parts in hand before pulling anything apart. The idler and output shafts should have zero end play, as in 0.00" is considered ideal as measured with a dial indicator Suggested reading 68 Overhaul Manual pg 7-111/PDF pg334 68 Service Manual Sections 0 and 3
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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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#33 |
Registered User
Join Date: Oct 2010
Location: Sag Harbor NY
Posts: 103
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Re: Stock rear gear ratio info
I've checked front and rear ends, trans and transfer case. All topped up with 90w
Cardan joint balls? The noise is worse under load, it quiets a bit when I let off the gas, clearly coming from transmission or transfer case
__________________
1985 Custom Deluxe long bed 305 3 on tree 2015 Silverado "Great White"1987 K20 dump and plow 1968 K20 327 long bed 4spd big blue 68K20 SuburPan 4spd 79C30 L96 6L90e 86 K10 plow |
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#34 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
The cardon joint balls are the front axle shaft u-joint swivel housings, they have seperate filler plugs L&R and in checking the driver's handbook are to be filled with SAE140 vs the differential's SAE 90.
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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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#35 |
Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Re: Stock rear gear ratio info
I always thought 3.08 and the granny 4 speed was a sweet combo. No need for overdrive and can still pull a house in first. Just watch the gap between gears!
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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#36 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
Suggested reading and in hand resources.
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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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#37 |
Registered User
Join Date: Oct 2010
Location: Sag Harbor NY
Posts: 103
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Re: Stock rear gear ratio info
Thanks, that's great I wish I had them. Unable to download the manual onto my phone. Just need to see diagram or know where fill is for cardan joints.
__________________
1985 Custom Deluxe long bed 305 3 on tree 2015 Silverado "Great White"1987 K20 dump and plow 1968 K20 327 long bed 4spd big blue 68K20 SuburPan 4spd 79C30 L96 6L90e 86 K10 plow |
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#38 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Stock rear gear ratio info
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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