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#1052328 - 07/16/17 01:45 PM Rear end gearing  
Joined: Jan 2016
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ray6914 Offline
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ray6914  Offline
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Joined: Jan 2016
Posts: 27
pittsburgh pa
I have a 84 Monte Carlo SS Street car 350 bored 40 over with a automatic turbo 350 3-speed transmission with a 2400 stall converter looking for recommendation on gear ratio it's a 10 bolt I believe it has 342 gears in it right now

#1052330 - 07/16/17 02:15 PM Re: Rear end gearing [Re: ray6914]  
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tedgley Offline
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tedgley  Offline
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Covington, KY
What's wrong with what you have in it now? 3.42 isn't a bad all around gear.

#1052331 - 07/16/17 02:48 PM Re: Rear end gearing [Re: ray6914]  
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3.42 is fine with a non-OD trans like the TH350. You don't want to lose MPG and increased engine wear with lower (higher numerically) gears.


86 MCSS Notchback coupe, LS3, 4L65E, column shift, silver with maroon bench interior

#1052418 - 07/19/17 12:23 AM Re: Rear end gearing [Re: ray6914]  
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TooSlow406 Offline
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Friendswood, TX
I agree too, as long as you're looking for MPG. You could even go 3.55s, but that a lot of work just to go up 1 size. But if you really want performance and don't care so much about the cost
of fuel, go 3.73s. If you ever get a OD, those would still be good or you could go up to 4.10s like I have. That being said, it's a lot of road noise with that low of gear.


1985 Monte 406sbc, RHS ported 220s, Schoenfeld 1 3/4", 3" exhaust, Dynomax Ultra-Flo, Holley ported Strip Dominator, Dual Holley Blues, Holley HP 950, Comp roller 236/245, .570/.574

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