Steve70Carlo Posted March 27, 2013 Share Posted March 27, 2013 Hey Guys, I've had my 70 FOR 16 years. Currently I am running a .030 over 454 with a mild cam, a full manual valve body 400 Turbo trans with a 3200 stall and 4.10 posi. Its been that way for about 10 years and I want to have a more street-friendly car. Two questions: A.) Can't I just switch out the converter for something like a 2200 stall or less without having the entire trans redone? B.) What kind of gears would work with the 12 bolt I have? I see a bunch of different options on web sites and am not sure what to get. I would like to go with a 2.73 or 3.08. This is just a shot in the dark, but if anyone would have these parts (converter or gears), I would be interested in buying those. Thanks for any help! Steve Quote Link to comment Share on other sites More sharing options...
monte70car Posted March 27, 2013 Share Posted March 27, 2013 Take a look for a 3.31 rear gear I have seen one rear gear company is remaking that gear. I have a 2200 stall in my 700r4 and a set of 2.73 rear gears its a nice cruising package with a 26" tire. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 27, 2013 Share Posted March 27, 2013 I would change the gears first, your converter may work ok once you get other gears Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted March 28, 2013 Share Posted March 28, 2013 Depending on how efficient you torque converter is it may be ok. The biggest issue is that you carrier is a 4 series 3.90 and up gears. Depending on your gear choice you will need a 2 or 3 series. That makes the cost go up on the gear change. Quote Link to comment Share on other sites More sharing options...
Steve70Carlo Posted March 28, 2013 Author Share Posted March 28, 2013 Thanks Guys, Mike- So if I were to look at a 3.08 gear ratio, which series would I need? I'm mechanically inclined but have never changed gears before. Is this something that I could do myself? Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted March 29, 2013 Share Posted March 29, 2013 Here is some info from the Mark Williams site CARRIER CONFUSION: When shopping for 12-bolt differential parts, keep this in mind: Chevrolet generally used three different types of differentials for the 12-bolt -- the two series carrier, the three series carrier and the four series carrier. The "two series" has little use in a hi-po application and should be avoided if at all possible. The three series carrier accepted ring and pinions that ranged from 3.08:1 to 3.73:1 while the four series carrier accepted ring and pinions ranging from 3.90:1 to 6.14:1. While there are a number of subtle variations between the three types of carriers, a major difference is the thickness of the gear flange. Two series carriers are the thinnest while three series flanges are thinner than four series flanges. Because of the size of the flange, the carriers cannot be randomly used with ring and pinion sets from the trio of "families". I think that there is a write up on gear swaps, try the search function. Quote Link to comment Share on other sites More sharing options...
72MC Posted March 31, 2013 Share Posted March 31, 2013 Here is some info from the Mark Williams site CARRIER CONFUSION: When shopping for 12-bolt differential parts, keep this in mind: Chevrolet generally used three different types of differentials for the 12-bolt -- the two series carrier, the three series carrier and the four series carrier. The "two series" has little use in a hi-po application and should be avoided if at all possible. The three series carrier accepted ring and pinions that ranged from 3.08:1 to 3.73:1 while the four series carrier accepted ring and pinions ranging from 3.90:1 to 6.14:1. While there are a number of subtle variations between the three types of carriers, a major difference is the thickness of the gear flange. Two series carriers are the thinnest while three series flanges are thinner than four series flanges. Because of the size of the flange, the carriers cannot be randomly used with ring and pinion sets from the trio of "families". I think that there is a write up on gear swaps, try the search function. Keep in mind, you can get an Eaton 3 series carrier and install Richmond 4.10/4.11 gears that are built for the 3 series carrier(much thicker ring gear). This ring gear set is actually considered better than the normal 4.10/4,11 gears used for a 4 series carrier. - Dave Quote Link to comment Share on other sites More sharing options...
Heckeng Posted March 31, 2013 Share Posted March 31, 2013 I agree with Sam, keep the converter, swap the gears. I would shoot for some 3.42's or something like that. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 31, 2013 Share Posted March 31, 2013 ever thought about leaving the gears and changing transmissions to a overdrive Quote Link to comment Share on other sites More sharing options...
Steve70Carlo Posted March 31, 2013 Author Share Posted March 31, 2013 Thanks for all the input so far guys. I'm finding that this could get pretty costly. I built the car about ten years ago and my tastes have changed since then. Back then, I wanted a race car in street clothes, and now I'm looking for more of a cruiser. I removed all heat and ac components, changed the steering to manual steering and installed a super loud exhaust. Just trying to decide which would be a better option at this point. I definitely don't have the cash to do a total revamp of the car. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 31, 2013 Share Posted March 31, 2013 it maybe cheaper to find a cheap rusted monte or Chevelle and take all the parts to put back on yours Quote Link to comment Share on other sites More sharing options...
Steve70Carlo Posted April 1, 2013 Author Share Posted April 1, 2013 That's an option that I haven't really thought about yet. Thanks for the input! Quote Link to comment Share on other sites More sharing options...
Archie Posted April 2, 2013 Share Posted April 2, 2013 I with Sam for a first step go with the gears (3.08). It'll really change the attitude of the car while cruising. Quote Link to comment Share on other sites More sharing options...
John Burns Posted April 2, 2013 Share Posted April 2, 2013 If that was my ride, I would go with a 3:31 gear- but changing gears in a 12 bolt is not easy at all. Even if you have all of the specialty tools, getting them "right" is not a straightforward thing. I'd find a mechanic you trust that has done it a few hundred times. Quieting the exhaust is easy and relatively cheap, but the absolute first thing I would do is get rid of the manual valve body. (I've never understood a manual vb- it isn't "reverse" is it? Why shift if you don't have to? You can always shift an automatic if you really want to.) Do those things and then see how if the converter is too annoying. B&M's 2400 is inexpensive and they work very well. Quote Link to comment Share on other sites More sharing options...
Steve70Carlo Posted April 2, 2013 Author Share Posted April 2, 2013 On the subject of quieting the car down a bit, which mufflers do you guys think I should look at? I heard that Magnaflow has nice mufflers, but there are so many different series that I'm not sure which would work. Quote Link to comment Share on other sites More sharing options...
John Burns Posted April 2, 2013 Share Posted April 2, 2013 I have these on my Monte: http://www.summitracing.com/parts/mpe-14586/overview/ They are a little pricey, but they are nice. Quiet and they don't rob much power. Get the biggest mufflers you can fit under the car- this is 22" and it fits. Quote Link to comment Share on other sites More sharing options...
zmanabba Posted April 3, 2013 Share Posted April 3, 2013 I have the same Magnaflow except in 2.5 inlet/outlet the sound mellow at idle or driving sane but really bellow when you get on it (at a track of course never on the street ;D). They will sound really quiet when you first get them but will break in and get louder after about 6 months of normal driving. David Quote Link to comment Share on other sites More sharing options...
Steve70Carlo Posted April 9, 2013 Author Share Posted April 9, 2013 What do you guys think about just going with an open rear? I really like having a posi but the way I think about it, is that I'm not racing anymore. Just throwing out some ideas. Quote Link to comment Share on other sites More sharing options...
72MC Posted April 9, 2013 Share Posted April 9, 2013 You can still have posi with 2 series gears, ie 2.73 0r 2.56. I have a GM series 2 posi carrier that is shelfed. - Dave Quote Link to comment Share on other sites More sharing options...
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