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#1052328 - 07/16/17 01:45 PM Rear end gearing  
Joined: Jan 2016
Posts: 30
ray6914 Offline
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ray6914  Offline
Junior Member

Joined: Jan 2016
Posts: 30
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]  
Joined: May 2017
Posts: 41
tedgley Offline
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tedgley  Offline
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Joined: May 2017
Posts: 41
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]  
Joined: Mar 2000
Posts: 5,593
upflying Offline
20+ Year
upflying  Offline
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Joined: Mar 2000
Posts: 5,593
Reno, NV
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, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1052418 - 07/19/17 12:23 AM Re: Rear end gearing [Re: ray6914]  
Joined: Mar 2003
Posts: 1,855
TooSlow406 Offline
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TooSlow406  Offline
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Joined: Mar 2003
Posts: 1,855
Dickinson, 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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