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#1 |
Registered User
Join Date: Oct 2015
Location: Clackamas, Oregon
Posts: 57
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Gears
Have a 64 with a 454/400th and a stock rearend and I'm looking to upgrade for a tighter twist and better RPMs at 70. Any recommendations as to what a poor boy can do? Thanks all!
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#2 |
Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,166
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Re: Gears
You probably have a 3.73 ratio. A 3.07 will work a lot better. I've got one from I believe an early 71 which is about 1 1/2 wider. After that they go to 5 stud. With 65 and up the panhard bar is shorter and mounts differently.
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#3 |
Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,166
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Re: Gears
Yours will probably have 17 spline axles and pressed on backing plates. In 65 I think they went to 30 spline, different drums and backing plates. Preferably get the 65 and up if you are getting a complete differential.
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#4 |
Registered User
Join Date: Mar 2003
Location: Northern Illinois
Posts: 2,181
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Re: Gears
Why not just put in a new ring and pinion? Seems a lot easier than changing an axle no?
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#5 |
Registered User
Join Date: Jan 2010
Location: Regina, SK
Posts: 804
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Re: Gears
3.42 is an option too. Like mentioned, you can just swap the ring and pinion.
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#6 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Gears
I agree that the gears can be changed. But unless the OP has the skills himself to perform the gear change and setup, paying someone to do it will more than likely exceed his 'poor boy' budget.
A '65-'70 12 bolt from a C10, will be a direct bolt in except for the panhard bar. Depending on tire size a 3.07 or 3.42 gear will work. Changing tire size can help as well to reduce rpm's.
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#7 |
Registered User
Join Date: May 2010
Location: Hillsboro, Oregon 97123
Posts: 1,300
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Re: Gears
I have a 496 big block my truck had 3.72 and i swapped in a set of 3.42...much better.
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#8 |
Registered User
Join Date: Jan 2010
Location: Regina, SK
Posts: 804
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Re: Gears
Ya that's true, I sold a complete 3.08 rear end for $100 last year so if you can find one that's prob cheaper. Not real easy to find though...and the 3.42 seem even more scarce around here.
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#9 |
Registered User
Join Date: Jan 2013
Location: Las Vegas, NV
Posts: 1,853
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Re: Gears
Need address your purpose of truck. If a daily driver over 55, then gear swap maybe. Is it lowered? Because a 1 to 2 inch of tire will do same as gears. A 3:73 to 3:42 sees little rpm benifit. My 308 gears and 27 in tire ran 3000rpm at 75. If a 29 in tire a 500 rpm drop. These trucks were not built for today's speed. So like me check brakes and steering for worn out parts. It's not all about speed but a 50 year old truck needs help to be safe. I would look for t700 or t200 od trans before gears and a good front end rebuild before hand.
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#10 |
Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,166
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Re: Gears
A 700R4 is on my wish list too. Unfortunately for me someone went through the junkyard and stripped all the transmissions of their kick down cable assemblies and speedo cable drives.
With a 700R4 I could go back to 3.73 gears by putting the parts from a good 64 diff into the original 66 housing with the trashed gears. |
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