The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-18-2015, 01:46 PM   #26
Lugnutz65
Registered User
 
Lugnutz65's Avatar
 
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,927
Re: gear ratio

Fellas, all engines (230, 250, 292, 283, 327, 350 Ford, Chevy, Mopar) doesn't matter make, size or model, will have the same RPMs if the final gear is the same, same tire size, at a given speed. That assumes no clutch slip and a manual transmission.
__________________
My 65 C10 build: www.lugnutz65chevystepside.weebly.com

Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.
Lugnutz65 is offline   Reply With Quote
Old 01-18-2015, 02:11 PM   #27
1966FLEETSIDE
Registered User
 
1966FLEETSIDE's Avatar
 
Join Date: Mar 2013
Location: central coast monterey county california
Posts: 348
Re: gear ratio

Awesome thanks for that valuable info tj'.I'm also veering towards tranny.it currently has a 3speed .that was converted to the floor .with a shifting pattern "H" reversed.so I don't know where that came from .lol
1966FLEETSIDE is offline   Reply With Quote
Old 01-18-2015, 02:32 PM   #28
Lugnutz65
Registered User
 
Lugnutz65's Avatar
 
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,927
Re: gear ratio

Ooops! Sorry. Two posts ago I forgot to include they have to have the same rear diff too.
You can have an engine tuned perfectly or it can run like crap. Doesn't matter. The RPMs will be the same.
__________________
My 65 C10 build: www.lugnutz65chevystepside.weebly.com

Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.
Lugnutz65 is offline   Reply With Quote
Old 01-18-2015, 04:31 PM   #29
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: gear ratio

Quote:
Originally Posted by Lugnutz65 View Post
Ooops! Sorry. Two posts ago I forgot to include they have to have the same rear diff too.
You can have an engine tuned perfectly or it can run like crap. Doesn't matter. The RPMs will be the same.
Wow like I didn't know that. lol What did I say wrong now?
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 01-18-2015, 04:38 PM   #30
Lugnutz65
Registered User
 
Lugnutz65's Avatar
 
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,927
Re: gear ratio

TJ,
No foul! Nothing wrong with what you said. His original post was looking for better RPMs. I just didn't want anyone to think that the engine performance had anything to do with RPMs.
I'm not correcting anything you said. Just trying to add emphasis that it all has to do with gearing, etc.

If he's gonna bolt up an S10 T5, then it will need to be 1993 or earlier.
I read your posts and you know a lot for your young age. Keep up the good work.
__________________
My 65 C10 build: www.lugnutz65chevystepside.weebly.com

Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.
Lugnutz65 is offline   Reply With Quote
Old 01-18-2015, 05:03 PM   #31
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: gear ratio

Quote:
Originally Posted by Lugnutz65 View Post
TJ,
No foul! Nothing wrong with what you said. His original post was looking for better RPMs. I just didn't want anyone to think that the engine performance had anything to do with RPMs.
I'm not correcting anything you said. Just trying to add emphasis that it all has to do with gearing, etc.

If he's gonna bolt up an S10 T5, then it will need to be 1993 or earlier.
I read your posts and you know a lot for your young age. Keep up the good work.
Sorry if I came on offensive. Thanks for the reminder of the S10 tranny of which year to use...Somebody told me 95 and I think it was T langdon...I made a mistake of accidentally calling him to early in the morning. lol
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 01-18-2015, 08:44 PM   #32
AcampoDave
Registered User
 
AcampoDave's Avatar
 
Join Date: Feb 2013
Location: central California
Posts: 2,776
Re: gear ratio

I'm with T.J. That 292 needs a tune up. You should be able to break 45 m.p.h with the 373 gear. Even when fully loaded.
AcampoDave is offline   Reply With Quote
Old 01-19-2015, 02:29 AM   #33
frankslagoon
Registered User
 
Join Date: Jan 2014
Location: Wasilla Alaska
Posts: 537
Re: gear ratio

I have a 63 with 3:73 and an o/d. I know its 3:73 cause I looked at the ring gear. In high gear, 1:1 out of the tranny these numbers are within acouple mph.
3000 rpm= 62mph. 4000 rpm=80mph. rear tires are 235/75/15 @28 or 29 in. tall. I used a 66 rear end I'm pretty sure 63 thru early 70 will fit except for panhead bar, which not a big deal. The way my numbers work out I should get around 3000 rpm=75 mph with a 3:07 ratio. Does that sound about right guys. with the o/d I see about 2100rpm=60mph
frankslagoon is offline   Reply With Quote
Old 01-19-2015, 09:36 AM   #34
vince1
Registered User
 
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,170
Re: gear ratio

Its easy figuring out your speed and RPM with the use of online calculators. If you have OD is it not suitable as is? I have the 3.07 with 4 speed and it is OK for my general use but I'd rather have a 3.73 with 5 speed or 700R4 auto. When I had the 3.73 with 4 speed it was way too slow on the highway but nice around the yard.
vince1 is offline   Reply With Quote
Old 01-19-2015, 11:45 AM   #35
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: gear ratio

Also something else to consider...running a taller tire will help make the gearing taller as well...for every inch taller tire they say about 10 mph is gained at same rpm. In my 66 I'm running a 30 inch tire and 3.73 gears...sm420...speedo is off a bit but I reckon 55 mph is around or just over 2500 rpm....now with a .82 od that rpm would drop to 2000(roughly). Also I wouldn't recommend a .64 od...for a stock 6 that's to much of a drop... .74 od is the tallest I'd go...6 bangers like close ratio trannys best.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 01-19-2015, 02:45 PM   #36
frankslagoon
Registered User
 
Join Date: Jan 2014
Location: Wasilla Alaska
Posts: 537
Re: gear ratio

Quote:
Originally Posted by vince1 View Post
Its easy figuring out your speed and RPM with the use of online calculators. If you have OD is it not suitable as is? I have the 3.07 with 4 speed and it is OK for my general use but I'd rather have a 3.73 with 5 speed or 700R4 auto. When I had the 3.73 with 4 speed it was way too slow on the highway but nice around the yard.
All the numbers I 'm given are from observed speed and RPM. except the 3:07 est. the o/d works pretty good. I have a small 283 and would preferre. 3:42s but I'm never happy with what I got. ? I also have the o/d behind a 4 sp. chevy did put the .70 o/d in the 6 cly. 3:73 trks. most of the pass. cars with the 3sp. o/d (.70) used 3:73 rear ends, but I believe that's as tail as ya could go.
frankslagoon is offline   Reply With Quote
Old 01-19-2015, 04:55 PM   #37
1966FLEETSIDE
Registered User
 
1966FLEETSIDE's Avatar
 
Join Date: Mar 2013
Location: central coast monterey county california
Posts: 348
Re: gear ratio

i appreciate the info fellas.if i decide to swap trannys,will an automatic bolt right on to the 292 its got?or what will? thx
1966FLEETSIDE is offline   Reply With Quote
Old 01-19-2015, 06:41 PM   #38
1966FLEETSIDE
Registered User
 
1966FLEETSIDE's Avatar
 
Join Date: Mar 2013
Location: central coast monterey county california
Posts: 348
Re: gear ratio

i guess it doesnt hurt to give it a fresh tune up,i did change to taller tires so that made some difference.but not where it should to my knowledge.thanks though.
1966FLEETSIDE is offline   Reply With Quote
Old 01-19-2015, 10:41 PM   #39
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: gear ratio

Quote:
Originally Posted by 1966FLEETSIDE View Post
i appreciate the info fellas.if i decide to swap trannys,will an automatic bolt right on to the 292 its got?or what will? thx
If yer not gonna be doing burnouts a T5 out of a 93 S10 with a v6 will bolt up using an adapter. Which can be purchased from Langdon's stovebolt.com. Other then that I'd recommend a richmond or tremic 5 speed.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 01-20-2015, 06:10 PM   #40
1966FLEETSIDE
Registered User
 
1966FLEETSIDE's Avatar
 
Join Date: Mar 2013
Location: central coast monterey county california
Posts: 348
Re: gear ratio

awsome thx tj,and that spacer goes where exactly tj?
1966FLEETSIDE is offline   Reply With Quote
Old 01-20-2015, 06:31 PM   #41
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: gear ratio

Quote:
Originally Posted by 1966FLEETSIDE View Post
awsome thx tj,and that spacer goes where exactly tj?
The spacer goes between the bellhousing and the tranny...this is for the T5...fas as I know the richmond and tremic don't need an adapter. The T5 will also require a shortened drive shaft and shifter relocate.
Edit. 93 or earlier doesn't require the spacer.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 01-20-2015, 06:32 PM   #42
Lugnutz65
Registered User
 
Lugnutz65's Avatar
 
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,927
Re: gear ratio

If you get a nice 1993 or earlier S10 T5, you can skip buying the $160 spacer and just swap the input shaft for a Jeep input shaft. That allows you to keep your original 10 spline clutch package. So you save money both ways.
See my signature for a link to my T5 pages and look around for the Jeep shaft swap page. I have also seen a thinner spacer that they sell on eBay but have no experience with that spacer. To my way of thinking the Jeep shaft swap is the perfect solution and cheapest.
__________________
My 65 C10 build: www.lugnutz65chevystepside.weebly.com

Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.
Lugnutz65 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com