how much gain from 3.73s?
I'm would be willing to part with my 3.42's for a good price. They are like new. Less then 25K on them.
I use to have 2.73 gears and a 2800 stall would run 9.20 1/8 mile with a 2.10 60ft. Swapped to 3.73 and was running a 1.89 60ft and 8.80-8.99 depending on spin. This was all done on street tires that were pretty shot. The car loved the bottom end with those gears. I now run 4.11 in one car and 4.56 in another and both rocket out of the hole.
Gears gain an awesome sotp feeling. The actual gains are minimal at best for autos.
The gear radio difference between 342s and 373s is so minimal the performance will be near identical..342s we cheaper, better mpg, stroker,etc.
Has been proven over and over that the et and mph difference is minimal at best between 323 342 and 373s.
I'm done arguing it.
The gear radio difference between 342s and 373s is so minimal the performance will be near identical..342s we cheaper, better mpg, stroker,etc.
Has been proven over and over that the et and mph difference is minimal at best between 323 342 and 373s.
I'm done arguing it.
I never understand all this MPG talk when it comes to gears. I went from 3.42s(m6) to 4.11s, no noticeable change in gas mileage. So what is the story, does the A4 just suck in regards to rear gear changes and mileage, or are people constantly bringing up an invalid point?
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Because gas mileage really doesn't have a lot to do with rpm levels, but rather load on the engine. An auto has no physical connection to the engine. It takes more effort for that engine to do the same work a manual does. Pair that up with a loose converter and gears...
With a manual I went from 3.73's to 4.56's and get the same MPG.
With a manual I went from 3.73's to 4.56's and get the same MPG.
2 scans at a set cruising speed.
run one,
hold in 3rd gear 40mph.
scan AFGS
on same stretch of road same direction,
run two,
hold in 4th gear 40mph.
scan AFGS.
Calculate average AFGS for both runs.
If I wasn't lazy today and actually fixed my heater hose I could easily do this right now. Then we could once and for all prove one way or another gearing effect on load and gas mileage.
Teching In
Joined: Aug 2010
Posts: 36
Likes: 1
From: Lakeland.FL
you wont see much on the 60"with out a stall.When i bought my car it had 3.73 richmond gear i am switching to 3.42 to drop the rpm on the interstate some.might to have your rev limiter re set exp 2-3 shift.my 60" was 2.0~2.13 pretty consitant.
just find an entire m6 rear end.
i bought an m6 3.42 rear end off of craigslist for $200, sold my stock 2.73 rear on craigslist for $125, so total with freshening up the 3.42 rear end was less than $100. definitely can't beat that with a stick.. with the rear end swap, aluminum driveshaft, and lca's i picked up .2-.3. but that could've easily been affect by many other things as well, like DA, etc...
i bought an m6 3.42 rear end off of craigslist for $200, sold my stock 2.73 rear on craigslist for $125, so total with freshening up the 3.42 rear end was less than $100. definitely can't beat that with a stick.. with the rear end swap, aluminum driveshaft, and lca's i picked up .2-.3. but that could've easily been affect by many other things as well, like DA, etc...
Doing what you say might actually work to your advantage, but increase that test to different driving conditions, like every day drivers experience, with an entire tank of gas and you may be surprised. I already proved to myself with four different gear sets the mileage was not greatly affected by gear changes. The first gear set was between 4.10's gearing down to 3.73's and received the same 19/25mpg, and on a road trip even did 27mpg while the 4.10 were being used which was on a completely flat road in east Texas on a 90* day with the A/C on. With the current engine I went from 3.73's to 4.56's and got the same 12/17mpg. That's enough proof for me.
Doing what you say might actually work to your advantage, but increase that test to different driving conditions, like every day drivers experience, with an entire tank of gas and you may be surprised. I already proved to myself with four different gear sets the mileage was not greatly affected by gear changes. The first gear set was between 4.10's gearing down to 3.73's and received the same 19/25mpg, and on a road trip even did 27mpg while the 4.10 were being used which was on a completely flat road in east Texas on a 90* day with the A/C on. With the current engine I went from 3.73's to 4.56's and got the same 12/17mpg. That's enough proof for me.
I believe mileage doesn't change much if at all, but NOT because load decreases. I believe it's from time spent at load decreasing with the gears. You don't accelerate as long therefore you don't use more fuel. My test would show that, but to do your way of testing would have too many variables to ever check.
That's the point. In every day situations an engine is exposed to all kinds of load differences (ie one gear combo or situation may let the engine operate around torque peak for a longer period of time). There are advantages and disadvantages to different gear combos. Average them together and the outcome of fuel consumption is minimal.
But I guess from 2.73's he does have a right to want more...they fuggin sux.
Now as one poster said.....variances between 3.23,3.42,and 3.73 might be minimal both in performance and consumption. But there is a difference.
I would probably skip 3.23 for a little more gusto in the 3.42s....3.73's seems like a lot but of course the final drive on the slush box should help depending on what its ratio is....anyone have a number?
Does GM put out 3.73 gears? You should be able to find GM 3.42s easy.
+1 for rumors of GM gears being the best. Do not run Zoom gears.
I went from 3:42's to 3:73's and dont really like them. 60 mph it to slow for 6th and it revs to much for 5th. It does come out of the hole better but for the money I wish I'd have stayed with the 3:42"s. Just my 2 cents....