My motor and trans are not original to the car. The trans I have now is a wide ratio and unless someone changed the rear gearing I have 3:08s.

I upgraded my motor to a 489 that I think will make about 500 hp, it hasnt been tuned or dynoed yet.

I think I need to upgrade to a close ratio M-22 because the car bucks in 1st and 2nd gear and they feel like they are just too low. But honestly I dont have my carb dialed in yet...

I am leaning towards getting the Autogear since it is brand new Im expecting I will have no problems with it, no leaks and it will be snickity-snack shifting. I see a lot of rebuilt trannys around but it seems like everytime I try to save a few bucks I get screwed in the end.

Since the original tran is gone anyway would you all just go with a brand new muncie?

If your having a hard time getting off the line (car bucking), going to a close ratio trans would just make it worse.

A wide ratio 1st gear is about 2.52, a close ratio 1st gear is about 2.20. I'd be more inclined to look at changing your rear gear before I changed transmissions. Much cheaper. I run a 3.42, but the more common are 3.55 and 3.73 rears. I found that my m21 (close ratio) was too much work trying to drive in the city. Changed to a m20 (wide ratio) and that made life a bit nicer.

Although, a brand new m22 would be pretty nice, wide or close ratio :)

Check the classified. I have a nice BW Super T-10 for sale.

I think I need to sort out my carb first. I have been avoiding it. I have problems in first and second. I had trouble adjusting the float level in the secondaries becuase the PO had added some extra volume to the Holley DP bowl and apparently had to customize the float level. I took all that off not realizing that. And now I have trouble like hesitation and bog. Im going to disasemble the carb today and see if I can get it dialed in.

With my HP requirement Im still thinking of getting a new trans though. If you were me would you take the chance on a old rebuilt one or get brand new?

Check the classified. I have a nice BW Super T-10 for sale.

Im 99% sure I want a muncie M-22. I want something that will bolt right in and look original. Thanks though!

You can get the M22 with wide ratio gearing from AutoGear or Jody's Transmissions (who posts regularly on here). I rebuilt an M22 with the wide-ratio gearset, 2.56 first gear and am real happy with it. Everything was purchased from Jody who gave excellent service after the sale in the form of technical advice.

Andrew, Thanks for the kind words.

Timothy,

I also think that a 3.08 differential is geared a little too high with an M20. I watched your "you tube" video of your Camaro and it appears that you have to ride the clutch to get her moving. I think that is more than a carb ajustment, your gearing combo is too high in first gear. An M21 or an M22 would even be worse of a combination than the M20 with the 3.08s.

An M20 behind a big block is at the borderline of its torque capacity. Yes, the M22W would be a better choice. The M22W gearset could be installed in your existing M20 for a cost savings.

I like Muadi's posting that a 3.42, 3.55, or 3.73 differential gearing would be much better choice than the 3.08s.

Timothy: Do what jody says. He has / is helping me. He designed a auto gear trans, built it and blue printeted it. He will work with you as long as nessary to fix your problem. Why heck, he is still helping me after 5 months. The man is good to his word.
Thanks Larry

Even if I get this combo working you are right. Since you mention that video I would also like to add I was starting out in 2nd gear. Well it seems to me that the shift pattern is reversed on that tran. 3rd feels like 4th etc. That tran came with a pile of parts when I got my car and I sort of just threw it in there to see how well it would work.

Jody how does this Differential look to you? I was told its a posi.

http://www.easymoney69.com/Images/RearDiff1t.jpg (http://www.easymoney69.com/Images/RearDiff1.jpg) http://www.easymoney69.com/Images/RearDiff2t.jpg (http://www.easymoney69.com/Images/RearDiff2.jpg)

That is a posi! I see your ring gear is stamped 41 and 9. Is this the same rear you are talking about in your post? 41/9 = 4.56s not 3.08s

Larry, Thanks for the kind words. May I post the link you sent me about your Vette?

Sure post away. That is the main reason I have not finished the camaro. You have no idea how much i appericate your help with the trans and clutch. One other thing, Rick at Long shifters said they have a shifter that will fit the 67 camaro and take the hurst handle about 495.
Larry 2206 AA/SA

That is a posi! I see your ring gear is stamped 41 and 9. Is this the same rear you are talking about in your post? 41/9 = 4.56s not 3.08s

Yes thats my 12 bolt. It was supposed to be a 3:08 from the factory so I guess it had a gear swap already. Does a close ratio or wide ratio work better with these gears?

With 4.56s... how about a TKO with 0.6 OD?

4.56s would be fine with the close ratio box, but wow are you going to be turning some RPM at cruise.

You really need to sit down and think about the entire package you want, from engine to rear tire, and then work toward making it happen. Unless you run very, very tall tires, the 4.56 is not going to be easy to live with.

My car came with the 4.56 rear gears and I first started driving it with those gears. Off the line it was great, but I couldn't shift fast enough and I was turning 3,300 RPM at 55 MPH. I now have 3.73 rear gears and think they are a good compromise for drive-ability and performance.
To sum it up, if you keep those gears, you will soon wish you had an overdrive tranny.

Sure post away. That is the main reason I have not finished the camaro. You have no idea how much i appericate your help with the trans and clutch. One other thing, Rick at Long shifters said they have a shifter that will fit the 67 camaro and take the hurst handle about 495.
Larry 2206 AA/SA

Check out this hole shot from fellow member "larry A/SA". His wheelstanding picture is the Corvette standing on its rear bumper!

http://www.indieimagesonline.com/

"The Vertical Vette"

Larry, The Long Shifter is worth every penny.

I love my Autogear it works well shifts pretty well.. seems just like my original muncie.

The carb was jetted really poorly for my combo. I now have the car driving as it should. And you all were right. 3300 rpm @ 55 (actually I think was was only at 45) is no fun. :sad: But no more bucking. :beers:

Since Im not going to modify it for a 5-speed I want to go with a wide ratio M-22 and some new gears so I can enjoy it more. With my BBC making decent power in the midrange and the wide ratio trans what would be a wise selection for rear gears? I want a streetable ride, it will have less than 1% track use. But I should still be able to smoke most any modern street car in the straight-away.

I am not a big fan of 3.08s and an M22W (2.56 1st) or an M20 (2.52 1st) but, some are doing it. But granted, once you are rolling in motion, even a 2.73 differential will work.

I have experienced that 3.31s, 3.42s, and 3.55s are a much better user friendly combination with the lower first gear Muncie. These combinations deliver less stress to the clutch during take off and stop and go traffic.

I would say your problem is your gearing. I have an M22W autogear now for a coulpe months and its working excellent, no leaks. I use a 3.55 gear with this wide ratio tranny. I could not see having anything higher in gearing. Lower if anything. With 3.08's your suffering, and the poor clutch is suffering too.

I drove the car this weekend and had a blast! While it lasted, I used up a tank in no time! :sad: So Im thinking the wide ratio with 3:42's, or even 3:31's if I can find em, would be really nice. :beers: I am also going to aftermarket rims in 17" so I can run a 27" tire. Thanks for all your help.

Anyone in North San Antonio know how to change gears in a 12 bolt? Looks like another learning experience for me. :hurray:

BTW Rich, it turned out someone changed the gears to 4.56, the carb had jets way too big and I also had my shift linkage upside down and was starting in 2nd! So it was a cluster f* er, fart.

BTW Rich, it turned out someone changed the gears to 4.56, the carb had jets way too big and I also had my shift linkage upside down and was starting in 2nd! So it was a cluster f* er, fart.


I had real time fun with 4.56 rear and 4 speed behind a mid 12 sec hot 350 in a 68 Camaro SS. But behind a big Block, don't sound good. Unless using huge tires
Good luck man....

:yes:I'm really happy with my combo!

:yes:I'm really happy with my combo!

The differents between your car and mind will be the weight. The Chevelle is a fat pig at around 3850 -3950 lbs. My 3.55 feel nice but 3.73 I'm sure would be nicer. Maybe with less weight my 3.55 would be satisfactory. They work good, but a little more snap would do it.

The difference between 2500 and 3000 rpm at highway speed is a big difference with my motor. At 2500 she sounds like she working a lil, at 3000 shes starting to groan. I could take a freeway drive at 2500 rpm but 3000 would get old fast. At 2500 with 3:42s I will be doing only 60mph and thats when I upgrade to 27" tires. Yeah people will be blowing past me at 80+ the way they drive here in Texas, but im still not getting a OD. :thumbsup:

http://www.easymoney69.com/Images/Texas66.jpg

How about the Jet Boats with Big Block Chevy. When your crusing down the lake your usually tacking 3500 rpm. and the motor is singing loudly. Sounds great and wouldn't want to change it. Your usually in the 3000 to 4000 area all day.
But we get in our cars with engine covered, tight rear gears, on the highway, and we start freaking when the engine starts taching near and above 3000. LOL.
Thats just the way it is. Right now I'm living with 3.55 gears and are usually at 3000 rpm on the freeway, and yes with people passing me at 75 to 85+..
I'll go worst with 3.73 before I would change to an overdrive. Just my opinion at this time.