4:10 gears
 

Thinking of putting 4:10 gears in my 91.....Are viper gears the preferred choice? What do I exactly need? Who has the best price for parts and what exactly do I need?
Thnx...

Re: 4:10 gears
 

I bought a dana spicer set from Just Differentials ( but that was in 2012)

their PN: D44HD-410-OE

http://www.justdifferentials.com/D44...4hd-411-oe.htm

Re: 4:10 gears
 

Sounds good......Does it come with gaskets? How do you like them?

Re: 4:10 gears
 

No gaskets, RTV for the cover. Being my ZR-1 is stock it was a worth while mod.

Re: 4:10 gears
 

Get a rebuild kit Attachment 7591


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Re: 4:10 gears
 

John, can i ask why you want 4.10's?
You'll be sliding/spinning tires.

I just finished my 391ci stock gears,new Nitto Drag Radials and it's a smoke show.

Pete

Re: 4:10 gears
 

I have to agree with Pete too, if you have a modded motor, unless you have wheel like Dominic and need the gear to compensate for that, Stock motor the 4.10 is a fun mod and worth it.. on a modded motor it might be too much

Re: 4:10 gears
 

Despite Pete's preference for 3.45s for drag racing. I think 4.10s were one of the best mods I did on both of my ZR-1s (along with the Hurst short shifter set up to look stock). One car had about 450 HP and one had closer to 500. Really made around-town street driving better . Face it, 99% of the time you will not be applying full power on every takeoff. If you are drag racing you can lug the engine a bit at the start, although you will need to shift to 4th in the quarter mile. For the three or four times I actually drag raced my cars it was fine with me. Not trying to set any records, just have fun. Depends on your goals for the car and your typical use. Your mileage may vary.--Bob

Re: 4:10 gears
 

=Jeff= is correct. With 19s in back, you'll want 4.10s which has the rear simulating ~3.53 gear with stock wheels. How about maybe 3.73?

Re: 4:10 gears
 

I hear ya Pete.....I'm just guessing it would be more of a " fun factor" if anything.....I know a few members that have the 4:10 s with a similar set up like mine.....Maybe I can take one for a spin before I make up my mind.....,

I know it would help with 6th gear cruising but most of the time I'm on the highway I'm using 5th....

Re: 4:10 gears
 

Yes this would be the best thing to do if you can.

Re: 4:10 gears
 

I've had a couple years driving one and the other; stock gears and 410s with motors approximately twinned. (Ami's has 410s and cams, mine has 3.45s and better porting.)

Snappy acceleration vs. rowing the gears...a LOT!

Driving Ami's car is reminiscent of driving a pushrod car - like the L98s: quick, peaky snap and its over...shift again...and again...etc, etc. IOW, it's noticeably more (and more) shifting.

For me, the 410s kinda takes away from the pleasure of a motor that has the legs to wind out; the very long hard pull that just never seems to run out of breath that (for me) defines the LT5. Yeah, when you hammer it, then the 410s show their stuff, but when your NOT hammering it, it's a lot of shifting.

However, the 3.45s will take 2nd gear all the way to 90 mph behind the LT5. Running the twisties (Mountain Runs) I can leave it in 2nd gear and let that fabulous torque curve do its thing. Pete put me onto the rice shaming 5-2 shift at 45-50 mph and hammering it to 7k. With the aluminum FW, it's all the Nitto drag radials can handle anyway!

Maybe if I still had the dual mass FW, I'd be more inclined to favor a 410. There was a significant seat of the pants improvement with the light (12#) FW - especially in the lower gears.

Yes, I like the snap of the 410s - especially when pulling ahead of traffic before the 2 lanes merge into one. But, on the other hand, the always shifting in normal driving...gets old too.

So! It's something one has to try for themselves. But, for me, I'm leaning toward Pete's new game...a nice healthy 391 cid LT5 in front of 3.45s so I can have it BOTH ways. SMOKE 'EM IF YA GOTUM!:dancing

Re: 4:10 gears
 

I agree with Paul, I went for the 3:73 think its the best of both worlds.

Re: 4:10 gears
 

Do any of you guys with 3.73 or lower(4.10's, 4.56's) with the stock tire heights ever do any 1-3-5 shifting when just driving her easy?

The last C5 I had some decent seat time is was a 1999 6 speed with the standard 345hp@5600/350lb/ft@4400rpm LS1. It had 3.42:1 gearing and its 2.66:1 1st gear ratio (autos were 2.73 or 3.15-but have the 3.06 1st gear of the 4l60e to aid with spirited acceleration-at least until that massive rpm drop into 2nd is encountered)
with stock tire height 275/40zr18 rears of 26.6" (315/35zr17 is 25.6") and I found city driving unenjoyable.
I always said that if I got into a C5, a rear gear change would be a must, or go for the lower ratioed Tremec M12 2.97:1 1st gear trans and LS6 engine, though you are still stuck with OEM 3.42 rear cogs.

I didn't think that the 97-00 LS1 had the best off idle part throttle grunt, esp. compared to a GEN-2 LT1. Would an intact LT5 be better or worse than an LS1 in the part throttle off idle torque department?

Re: 4:10 gears
 

Just as aside to this rear gear discussion, when I was a teenager in the early sixties working at a local marine hardware store, the guy who ran the lumber yard--Vinnie from the Bronx--was building a '56 chevy based drag car with a big block (probably a 396). He said he was running 5.13 rear gears! What a stump puller.Probably shooting for wheelstands, and probably got up to about 20 mph before he had to shift to second. I don't know how well he ran in the quarter mile. That pearl is lost to history.--Bob

Re: 4:10 gears
 

John,
Come on down to Wazooland and try it out. I have 410 gears with stock engine with headers, Corsa and Marc's chip. First and second gear are short but 6th is outstanding for the highway. Turning 1850-1900 RPM at 70mph and can pass without down shifting

Re: 4:10 gears
 

Was the first mod I did to the Z was the 4:10's. I think it really woke the car up. Now with the engine mods I really like the acceleration! Rolling into it the tires grip and it pulls hard.

Re: 4:10 gears
 

Hey Charlie....
Maybe the next maintenance day Jim has I will make a whole day of it......Hell, maybe I will even get a motel room for the night and rip around the roads there for the day...

Look forward to meeting the rest of Wazoo....

Re: 4:10 gears
 

No need for motel, we have room!

Re: 4:10 gears
 

Going by Captree on Sundays ? I'm close , you can check out my blue 94 with 4:10s.

Re: 4:10 gears
 

Hey man, thanks.....

Re: 4:10 gears
 

Hi Frank...

Yes I do go at times....Actually was there about a month ago.....Was able to make a corvette show last Sunday in Paramus...

Lots of corvettes and three other ZR-1s at show......Will post up when I do go to captree next time...

Re: 4:10 gears
 

I bought everything you would need to do the 410 swap but I’m having second thoughts about putting them in my car let me know if you will be changing them I might consider selling my gears. If you guys do captree I will take a ride out as well[emoji41]


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Re: 4:10 gears
 

Hey George how have you been.....I was at Belmont a few weeks ago and I'm pretty sure I saw your car leaving the show,I arrived late.....

Will touch base with you next time I go out there....
Hope all's well....

Re: 4:10 gears
 

I (for one) often do 1-3-5, even with the 3.45s. But, definitely with Ami's 410s.

Re: 4:10 gears
 

I would ride in a car with 4.10's and see if you like them. In 2014, Marc Haibeck did the 510 HP upgrade to my Yellow '95. He also did 4.10's. Before doing it, I went back and forth and looked at the speed chart - gear/speed/rpm and drove myself nuts trying to decide if I should do it. I took the plunge after getting opinions from Marc and others. I will say that I really, really like them. I also have two stock ZR-1's with stock gears for which to compare the 4.10's. Do I now not like the factory gears? ...No, not at all...I can appreciate both.

As for the modified car, between the extra HP, the lightweight flywheel, the extra noise from the Corsa exhaust, and especially the 4.10's, well, it has really made this car take on the "race car" persona...just like Marc said it would. I don't find anything about the swap that was "too much". Under hard acceleration from 1st gear, you still use all gears. Under light acceleration you still can skip gears. No regrets!

Re: 4:10 gears
 

4.10's for me, all good

Re: 4:10 gears
 

When my 3:36 gears broke in my 73 I came across a complete 3:70 unit so I installed that.......The fun factor and the pick up on the low end was noticeable....Now, if the car had a five speed I stead of a four speed it would be the gear of choice....

Even though my Z is modified I'm guessing the 4:10 would make the car more snappier and more fun around town...

With all the insane horsepower the new ZR-1 and Z0-6 have I'm sure Chevy isn't worrying about spinning tires....Cheers.

Re: 4:10 gears
 

The perennial conundrum, to go with 4.10's or stock gears, that is the question.
The quick response is, 4.10's of course, if you care about performance.
It's one of the cheapest mods and gives you more performance when and where you need it.

The stock gear ratio was used by GM for MPG., to avoid the gas guzzler tax, not for optimum performance.

Unless you spend a lot of time cruising above 150 mph, 4.10's are the optimal gear. When was the last time a three speed stick was the optimal transmission for the quarter mile? 1956?

The LT5 is not a torque monster, it's a rev monster. It's more efficient that way. With 4.10's you can take fourth gear to 140 mph. And you still have two more gears to get all the mpg you want.

My car has only about 425 hp., but even if I had 725 hp. I'd still use the 4.10's. Because if you have no traction in 1st. gear, you have a tire problem not a gear problem. Even with street tires 4.10's are better than bogging down with a tall gear. The solution is practice.

JMHO

Re: 4:10 gears
 

Very well said.....Most high performance cars will use a high gear similar to the ZR-1 to avoid the gas guzzler tax.....Neck, I even think the first Vipers used a 3:08...

Re: 4:10 gears
 

I know its early but my plans changed, so I am actually heading out to captree this morning....Anybody up, come by....

Re: 4:10 gears
 

The choice of 4.10's and 3.45's is a matter of personal preference. Each has its advantages. As for me, I prefer the 4.10's and would never consider switching back. Street performance and the associated fun factor is significantly better!

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Re: 4:10 gears
 

Just got our 91 ZR-1 with 4:10 gears, and without knowing how a 3:45 performs, I can verify the fun factor with 4:10's. Almost scary in first and second gears. Have had many strong musclecars, but the ZR-1 is borderline insane. Probably need to get a Haibeck 368 one day too... [emoji28]

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Re: 4:10 gears
 

A friend just changed gears. He went lower. Kept the same tire size diameter.


What about controlling the speedometer to actual speed?


What does he need to do/buy to get it correct?


Thanks

Re: 4:10 gears
 

Marc Haibeck offers speedometer correction gears to swap out in the ZF. Not sure of his supply though. I think I lucked out and snagged his last set for 3:90 Speedo correction gears when I had my D44 rebuilt and upgraded. I believe the swap will get you to within +\- 2 mph of actual speed. I tried testing mine against one of those billboards that show you your speed and I was actually right on target for accuracy.

Re: 4:10 gears
 

Thank you