robs70monte Posted February 22, 2011 Share Posted February 22, 2011 Well im going threw my Monte 8.2 10 bolt i haven't taken it apart yet so i don't know what gears are it but i know its not a posi and its make some loud noises i have a posi carrier and some 3:31 gears they any good for this combo?,Its a mildly built 350 .30 over flat tops camel back heads,268h comp cams cam, performer intake and a holly 680cfm,headers with glass packs and a th350 with a shift kit stock converter. that all i can think of for now let me know if i forgot any thing i plan on dragging the car this year and i hope to run some ware in the 13s Any help is appreciated Quote Link to comment Share on other sites More sharing options...
amsterdam84 Posted February 22, 2011 Share Posted February 22, 2011 How do you know it's an 8.2? I'm trying to find what I have. Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 22, 2011 Author Share Posted February 22, 2011 The 8.5 10 bolts have ears on the bottom of the housing the 8.2s don't correct me if im wrong any one theirs a web site i saw in a post not to long ago that listed how to tell them apart Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 22, 2011 Author Share Posted February 22, 2011 Here it is http://www.chevellestuff.com/qd/generic_rear_axle_info.htm Quote Link to comment Share on other sites More sharing options...
amsterdam84 Posted February 22, 2011 Share Posted February 22, 2011 Perfect! Thanks for the link! Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 23, 2011 Author Share Posted February 23, 2011 Any input guys Quote Link to comment Share on other sites More sharing options...
MGD72Monte Posted February 23, 2011 Share Posted February 23, 2011 Not sure exactly what you are asking. If the car came with a 350 SB, it likely has 2.73 gears. By comparison, 3.31 gears usually came with the 454 and should give you better acceleration, better ETs, but less top end speed and less gas mileage. There are web sites that can give you anticipated performance based on the specs you have. Â I'm not an expert, if you need more you need to get some of the drag guys to comment on this. Dave? Bill? Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 23, 2011 Author Share Posted February 23, 2011 I jest want some opinions on what gears to run im not much of a rear end guy myself Quote Link to comment Share on other sites More sharing options...
MGD72Monte Posted February 23, 2011 Share Posted February 23, 2011 I'm not a rear end guy myself either,... well at least when it comes to cars, but I would say that it depends on what you want. I like the 2.73 because it gives me good gas mileage on the highway and sufficient acceleration, but if you want to go from stoplight to stoplight as fast as possible, I would say the higher ratio is what you want. Â Hopefully one of the drag guys will speak up at some point. Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted February 23, 2011 Share Posted February 23, 2011 If you have a set of 3.31s that would be a nice gear to wake it up a little. Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 23, 2011 Author Share Posted February 23, 2011 Ok 3:31s it is. right now if I put the car in drive the shaft spins but the car don't move so its safe to say the ring gear is trashed Quote Link to comment Share on other sites More sharing options...
LS5 Posted February 23, 2011 Share Posted February 23, 2011 ask CRAZY DAVE.....he will help his chevelle launches real good if you have read his past threads...331's for highway driving hands down, for strip and top end stuff 373 or 411's... Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 23, 2011 Author Share Posted February 23, 2011 Ok ill look around for some more gears to pick form I might have some 3:55s or 4:10s Quote Link to comment Share on other sites More sharing options...
Shadow Gray SS Posted February 23, 2011 Share Posted February 23, 2011 If you plan on cruising it at all, I would recommend nothing more than 3:55's. When I bought mine it had 4:11's and at 50mph it was turning about 3300 rpm Quote Link to comment Share on other sites More sharing options...
KWick_70MC Posted February 23, 2011 Share Posted February 23, 2011 I jest want some opinions on what gears to run im not much of a rear end guy myself  I am not touching this one.. Quote Link to comment Share on other sites More sharing options...
Heff Posted February 23, 2011 Share Posted February 23, 2011 I debated the same thing a couple years ago when I did my 12 bolt. I had bought a set of 3.31's from e-bay but one of my friends convinced me to go with 3.55's. I'm glad I did the 3.55 these are big heavy cars. Quote Link to comment Share on other sites More sharing options...
Winston Wolf Posted February 23, 2011 Share Posted February 23, 2011 You better go at least 3.73 if you plan on getting that engine in the 13's.... Quote Link to comment Share on other sites More sharing options...
MCfan Posted February 23, 2011 Share Posted February 23, 2011 Rob,  I don't know what your plans are regarding rear tires, but they will also affect your car's performance (i.e. acceleration, speed, mileage) because your OVERALL drive ratio includes the gear ratios of your tranmission, the "rear end" ratio AND the size (diameter or height) of your rear tires.  Here's a very useful web site if you want to see the performance results of changing any or all of these factors:  http://vexer.com/automotive-tools/speed-rpm-calculator  You will first have to edit the axle ratios (i.e. change 3.23 to 3.31), select "automatic transmission", edit the transmission gear ratios (i.e. 2.52 for 1st and 1.52 for 2nd in a TH350) and edit the vehicle weight (I used 3850). Then edit your tire profile or height and torque converter efficiency.  Now select a forward gear (1, 2 or Drive) and move the throttle slider up to the rpm limit you plan to set (watch the digital displays not the gauge needles). It will show you the mph (for that rpm), your predicted quarter mile ET and Speed and even give you a required horsepower estimate for that set up! I had to play with it awhile to get it set up but it very helpful once you figure it out.  Whether you choose a 3.31 or a 3.55, you could run a taller tire on the street for more efficient cruising and a shorter tire on the strip for beter launch and acceleration. It's a common practice, of course. Quote Link to comment Share on other sites More sharing options...
AL M Posted February 23, 2011 Share Posted February 23, 2011 Some of the 350/2barrel cars came w/10 bolt BOP(Buick/Olds/Pontiac) rears right from the factory. Make sure you know exacly what you have 1st. I redid my BOP w/ 3:55s. It was a little pricey but I heard that theyre real strong and it helped get my old 355ci into the 12's. Either way a gear change is going to feel like you gained 100HP and put a nice smile on your face....Enjoy!! Al Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 24, 2011 Author Share Posted February 24, 2011 Thanks for the help guys looks like I'm going to be looking for 3:55s great site and it is a 8.2 bop rear end Quote Link to comment Share on other sites More sharing options...
AL M Posted February 24, 2011 Share Posted February 24, 2011 Your only choices for your BOP are Richmond 3:55/3:90/4:11, and I think Motion makes a 3:75 now. The Eaton posi unit is Pricey @ around $550 but its for 3-4 series gears so if you ever wanted to go more radical in the future you could just throw 411's in there. The Ring and pinion is around $250, plus another $100 for the install kit and another $200 for the install. Just a heads up. Â Â Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 24, 2011 Author Share Posted February 24, 2011 I'm going to get the summit catalog out tonight and order up some gears ect.. Im going to get some eagle h beam rods and some speed pro .125 dome pistons and light weight vlaves for the camal backs figure while I have the motor out do it up agin but better this time around Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted February 24, 2011 Share Posted February 24, 2011 I would try to come up with a honest plan as to what you expect to get out of your monte. .125 dome pistons really pumps up the compression on a small block. H beam rods are great, I run them myself you will need to get the assembly balanced. Lots of 350s have cast cranks including our montes. H beam rods are overkill on a cast crank. There are a lot better heads out there now than the camel back heads I would consider that before putting a lot of cash into a head that has limited capabilities as compared to more effective heads. I am not trying to put a damper on your party but I want you to be happy with it when you are done. Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted February 24, 2011 Share Posted February 24, 2011 I see you are selling a set of vortec heads in the for sale section. They are a whole lot better than the heads that you have on the motor and you don't need dome pistons Quote Link to comment Share on other sites More sharing options...
robs70monte Posted February 24, 2011 Author Share Posted February 24, 2011 I dis like the center bolt valve covers and I don't have a vortech intake I have a set of camal back heads I might try also but for now I want to see what I can do with the 882s if I don't like them ill go with the camal back heads Quote Link to comment Share on other sites More sharing options...
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