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| 3.08 to 3.42 or 3.73 http://classiccamaroclub.mfatw.com/viewtopic.php?f=4&t=4310 |
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| Author: | rustyformula [Tue Feb 10, 2015 6:53 pm ] |
| Post subject: | 3.08 to 3.42 or 3.73 |
Hi - anyone uprated their rear end from a 3.08 to 3.42 or 3.72? If so how noticeable was the improvement? Im considering it for my 73 with a muncie 4 speed and a big chevy 427. Maybe going from 3.08 to 3.73 is too much and the big block has enough grunt anyway- although its mostly around town driving so "highway" rpms less important. Maybe going from 3.08 to 3.42 wouldn't be a noticeable enough improvement to spend the cash on? Also , choosing between a ram power grip or a centerfore dual friction clutch - opinions? thnx |
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| Author: | 3rdGenmalc [Tue Feb 10, 2015 7:01 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
I went from 2.80 to 3.42, made it pretty nifty, 3.73s were looking good but the conservative in me won. |
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| Author: | firebird68 [Tue Feb 10, 2015 7:29 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
With a big block I would think 3.42 would work well . Also is it a wide ratio ( M20 ) or the close ratio M21 or M22 ? Makes a difference in low gears . Also RPM at cruising speed will be worse ( higher ) if you go for the 3.73. |
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| Author: | flak monkey [Tue Feb 10, 2015 8:36 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
For a big block 3.08 is plenty unless you have very good tyres and an overdrive box. |
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| Author: | rustyformula [Tue Feb 10, 2015 11:13 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
its an m21 if it helps. 2.2 1st gear |
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| Author: | chevy-stu [Wed Feb 11, 2015 11:25 am ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
I went 2.56 to 3.42 and I've got a 5 speed overdrive, i definately wouldn't go higher, as cruising revs would just be crazy, fuel would be crazier, and I would be less likely to drive it.... |
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| Author: | firebird68 [Wed Feb 11, 2015 8:23 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
I'm going from 3.55 to 3.08 when my ride gets back on the road, with a wide ratio M20 the new ratio will provide a good compromise on cruising RPM and acceleration . |
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| Author: | TopCat [Fri Feb 13, 2015 11:59 am ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
I would stick to 3.08 with a BB otherwise you will be doing loads of RPM at say 80 mph = huge fuel bills. better to fit an LSD with the higher ratio Look at the RPM @60 mph per tyre size below: Tyre Diameter Rear Axle Ratios inch 2.73 3.08 3.55 3.73 3.91 4.11 4.56 4.88 24 2268 2587 2982 3133 3284 3444 3830 4099 24.5 2222 2534 2921 3069 3217 3374 3752 4016 25 2177 2484 2863 3008 3153 3306 3677 3935 25.5 2135 2435 2807 2949 3091 3241 3605 3858 26 2093 2388 2753 2892 3032 3179 3536 3784 26.5 2054 2343 2701 2838 2975 3119 3469 3712 27 2016 2300 2651 2785 2919 3061 3405 3644 27.5 1979 2258 2602 2734 2866 3006 3343 3577 28 1944 2218 2556 2686 2815 2952 3283 3514 28.5 1910 2179 2511 2368 2766 2900 3227 3452 29 1877 2141 2468 2593 2718 2850 3170 3392 29.5 1845 2105 2426 2549 2672 2801 3116 3335 30 1814 2070 2386 2507 2628 2755 3064 3279 All figs are RPM at 60 mph in top gear (1.00:1) |
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| Author: | The Seer [Fri Feb 13, 2015 1:50 pm ] |
| Post subject: | Re: 3.08 to 3.42 or 3.73 |
I've got a 3.90 via a TH350. Great for the quarter mile, rubbish for anything else! My mpg is terrible and the engine is constantly buzzing, it's really off putting. |
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