Rear end
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,990
From: Connecticut, USA
Very little difference between and 308 & 336. If you have an automatic no issue and really not worth doing unless the diff needs work. With an M20 you can run a 308 but a sb has less torque than the bb and you probably wouldn't like as much. If you are thinking of doing it to save gas, again don't waste your time.
Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,094
Likes: 4,449
From: Marlton NJ
9% less torque available in 1st gear.
Goes 9% more mph before shifting
9% less rpm at cruise speed
In other words not a lot.
And a whole lot of work.
Goes 9% more mph before shifting
9% less rpm at cruise speed
In other words not a lot.
And a whole lot of work.
Last edited by leigh1322; Mar 28, 2021 at 04:12 PM.
Thread Starter
Racer
Joined: Mar 2011
Posts: 359
Likes: 13
From: Elma NY
Thread Starter
Racer
Joined: Mar 2011
Posts: 359
Likes: 13
From: Elma NY
Melting Slicks
Joined: Nov 2006
Posts: 3,413
Likes: 1,824
From: Apple Valley, MN
Matching numbers = $$$. I would address your needs independent of the two differentials.
What don’t you like about how the 69 runs? I have a 69 that had 3:36s and put in a set of 3:73s. I also put my original M20 on the shelf and put in a TKO-600. Two different cars! Hole shot heaven and cruise all day at 70 with the overdrive 5th gear.
What don’t you like about how the 69 runs? I have a 69 that had 3:36s and put in a set of 3:73s. I also put my original M20 on the shelf and put in a TKO-600. Two different cars! Hole shot heaven and cruise all day at 70 with the overdrive 5th gear.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,217
Likes: 9,354
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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the 350 would love a 3.70 or 4.11s if you are looking for off the line performance. If you are on the highway then maybe a 3.55 rear. I have had the 3.55 behind a M21 and it sucked off the lights under normal throttle and not too bad behind a M20. If you do go to a 5 speed with a low first gear the 3.36 would perform much better
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