Diff ratio change?
Thread Starter
Advanced
Joined: Jun 2013
Posts: 56
Likes: 0
From: Senoia GA
Diff ratio change?
I found that my 76, has a 3.55 diff. Obvious change by PO. This explains the tach readings at 65 mph. I personally would prefer better mileage and lower rpms. The engine has an edelbrock intake and Holley carb as well. Would there be an issue with changing to the 3.08 diff. There is a bit of yoke play, I'd say 1/8"+ left side and 3/16" + rt side. I'll get an inside look when I drop it to change the leaking gasket. My intent is to have a reliable distance driver, 300-400 miles per day, for family visits and or over nite sight seeing trips. Thanks.
Last edited by Higgy76; Mar 11, 2014 at 07:45 PM. Reason: Clarity
Pro
Joined: Nov 2013
Posts: 730
Likes: 37
From: Catoosa Okla
Had I only known....
My 74 Convertible had 3:08's. I Just,and I mean JUST got the gears changed out and rear end gone through with a rebuild kit tonight. Yup. You guessed it. I'm going with 3:73's, however it's backed with a 4L60e so the overdrive will make it highway cruise-able yet still funner than batpoo to drive. These days it seems you CAN have your cake and eat it to... Have ya considered a transmission swap? You can put a 700R4 in and still use the old school motor. Oh...then you can leave that perfectly fun gear ratio.
My 74 Convertible had 3:08's. I Just,and I mean JUST got the gears changed out and rear end gone through with a rebuild kit tonight. Yup. You guessed it. I'm going with 3:73's, however it's backed with a 4L60e so the overdrive will make it highway cruise-able yet still funner than batpoo to drive. These days it seems you CAN have your cake and eat it to... Have ya considered a transmission swap? You can put a 700R4 in and still use the old school motor. Oh...then you can leave that perfectly fun gear ratio.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I found that my 76, has a 3.55 diff. Obvious change by PO. This explains the tach readings at 65 mph. I personally would prefer better mileage and lower rpms. The engine has an edelbrock intake and Holley carb upgrades as well. Would there be an issue with changing to the 3.08 diff. There is a bit of yoke play, I'd say 1/8"+ left side and 3/16" + rt side. I'll get an inside look when I drop it to change the leaking gasket. My intent is to have a reliable distance, 300-400 miles per day, driver. Thanks.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
For a "300-400 miles per day" car, I wouldn't consider a Holley carb an "upgrade".
But... I'd be considering going to an overdrive transmission, that would make the car really purr.
Before that, I'd be looking at a different car to drive every day. For a *lot* of reasons...
But... I'd be considering going to an overdrive transmission, that would make the car really purr.
Before that, I'd be looking at a different car to drive every day. For a *lot* of reasons...
Thread Starter
Advanced
Joined: Jun 2013
Posts: 56
Likes: 0
From: Senoia GA
For a "300-400 miles per day" car, I wouldn't consider a Holley carb an "upgrade".
But... I'd be considering going to an overdrive transmission, that would make the car really purr.
Before that, I'd be looking at a different car to drive every day. For a *lot* of reasons...
But... I'd be considering going to an overdrive transmission, that would make the car really purr.
Before that, I'd be looking at a different car to drive every day. For a *lot* of reasons...
Higgy
