Who here runs a 3:73 gear behind a TH-350 automatic.
and if so how do you like it?
and if so how do you like it?
3:73 behind an automatic
chevy kevy
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276 Posts
Who here runs a 3:73 gear behind a TH-350 automatic.
and if so how do you like it?
and if so how do you like it?
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80 Posts
Anyone? I am curious about this also, I would like to run 3.73 but most people have recommended 3.55 for me since I will have it on the freeway every so often.
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432 Posts
I run a 3:31 12 bolt in my 66-396 with a Turbo 350. I thinks it's the best of both worlds for my driving needs. At 50 MPH around town --2000 RPM. At 60--2400. At 75--2900 RPM. It's quick off the line for a heavy convertible but then again will cruise at 80 with the engine rpm not driving me crazy.
Bob in CT
Bob in CT
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998 Posts
rpms run at about 3000 at 60 with 3:73`s in my 71 but i am not for sure as i didnt change my speedo gear when i swapped the rears out so it may be off!!
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22,967 Posts
I run a 3.73 gear in my '70...about 3500 rpm at 70mph.
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854 Posts
I'm running 3:73 with a 4 speed. I think it is to low geared but I do alot of highway driving to get to the cruises.
I used to run 4.11 behind TH-350. Everyone thought I was crazy, one guy even thought my tranny was not shifting into 3rd. I must say 4.11s are awsome until your just crusing along trying to get somewhere. Then it is a slap in the face. Now I have to either get overdrive or change gears since it is my daily driver in the summer. I know 4.11s aren't the same as 3.73 but I'd say go for 3.55 if you plan to drive it a lot on the street.
I have a 4.10 posi with 28 inch tall tires which gives me the same ratio as a 3.73 with 26 inch tires. I have a 2200 stall converter and a 388 stroker. It tough not to smoke the tires. But is this not the reason we are all using this web site? Old American muscle?
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3,051 Posts
I have a 2004R and in 3rd gear ( 1:1) the engine is going way too fast for cruising. 4th gear is perfect ( 0.67:1).
We run a 3.73 gear in an 85 Cutlass with a built Olds 350 and a 3500 stall.
Fun at the track and on the street,no fun on the highway.Get in the right lane and stay there.
Fun at the track and on the street,no fun on the highway.Get in the right lane and stay there.
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1,180 Posts
I plan on putting 3.73's behind my TH350 soon but the future plan is a 700R4. I am trying to think ahead.
Frank
Frank
At first the 3.73s seemed like too much(original 2.56),then I got used to it,then a cam upgrade made it even better.Switched to 4.56s(I change rears every so often,3.73-4.56)and the 3.73 seem like overdrive compared to them.Probably ought to ride with someone that has a set.They're too much for some,not enough for others.
We've run 3.73's in all five of our V8 powered S10's. They are a little hard on gas for a long trip. We got about 16 mpg doing 65 mph from Binghamton, NY to Carlisle, Pa and back. The engine is a pretty much bone stock 350 SBC with a Edelbrock Performer cam and carb, dual 2 1/4" exhaust, TH350 with a 2800 stall converter, and rear tires are BFG 235/70/15's (so they're a little taller which helps keep the rpms down a little=better gas milage)
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276 Posts
I'm running BFG 255/70/15 and would even like to go bigger on the rear.
So that should help keep the RPM down a bit. I plan on putting a gear vendors
OD on this summer so that should even things out.:thumbsup:
So that should help keep the RPM down a bit. I plan on putting a gear vendors
OD on this summer so that should even things out.:thumbsup:
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