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Offline Cameron 77C3

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Over Drive Units
« on: January 23, 2006, 07:25:17 PM »
Got a 3 speed auto in your vette.  Want to have taller diff gears to be quicker off the mark, but don't want to have your engine screaming its head off on the highway.  One of these might be the go.

I found this link in the latest street machine magazine.  Might be the go.   CLICK ME for the link
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Offline 72vet

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Over Drive Units
« Reply #1 on: January 23, 2006, 09:14:37 PM »
Cam, funny enough, but I just got my T 400 replaced with T 700R4
The conversion took about a week with the only problem being
the exhaust pipes that run past the box into the crossmember
which were remade in stainless.
In the price -
Supply and fit the box & modify the crossmember
wide area 2nd & 4th gear bands
beast connecting shell
VT high energy 3rd 4th clutches
stage 2 shift kit ( fair banks )
500'' boost valve
corvette 2nd & 4th gear servo
2200-2400 rpm stall converter
plus service the T400 replaced pump,gasket & front seal ( that I think I have sold )  
price $2700.00  ( not including exhaust)
Now she sits on 70mph (110kph) at 2400rmp instead of 3100rpm with
the 3:55:1 diff that's in it
4 speed auto with overdrive looking forward to some long drives now
& and not having to search for fuel.
;laugh;laugh
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Offline 69VETTE

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Over Drive Units
« Reply #2 on: January 24, 2006, 08:53:09 AM »
Great stuff Cameron 77C3.

Oh.... 72 Vette...would love to see your setup.... sounds awsome buddy..



M;36
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Offline Mattrix

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Over Drive Units
« Reply #3 on: January 24, 2006, 03:45:48 PM »
that sounds mad. I was just thinking about that very thing the other day while driving my car. one of the mods for the distant future :)
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Offline jolinari

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« Reply #4 on: January 25, 2006, 12:44:25 PM »
Quote
Originally posted by Cameron 77C3
Got a 3 speed auto in your vette.  Want to have taller diff gears to be quicker off the mark, but don't want to have your engine screaming its head off on the highway.  One of these might be the go.

I found this link in the latest street machine magazine.  Might be the go.   CLICK ME for the link


MMM FLEXING YOUR ENGINEER IDEAS!!!!;41
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Offline Cameron 77C3

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Over Drive Units
« Reply #5 on: January 25, 2006, 10:49:17 PM »
Looking very hard at it.  I'll finish her off first.  Then may be later this year when I do the rear end........might just add something to the gear box.
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Offline Lefty

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Re: Over Drive Units
« Reply #6 on: May 16, 2014, 05:02:08 PM »
Camo,
Came across this old post. Did you fit off a gear vendors overdrive?
If not has anyone on the forum fitted one into their vette?

Ive got the same problem all c3s have over revving.
When I bought the care fuel economy wasn't considered but this thing just bangs out loud.
I've been looking for a simple fix, NAND came across this bolt on solution.

Any one used this yet?

Cheers,

Lefty
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Offline bfit

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Re: Over Drive Units
« Reply #7 on: May 16, 2014, 06:31:20 PM »
The best thing you can do for your C2/3 vette. Is fit n over drive gear box
Either a T700 auto or a t56 manual
Bfit
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Offline Camo

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Re: Over Drive Units
« Reply #8 on: May 16, 2014, 07:40:51 PM »
God, that goes back a ways  :thud:

Didn't fit it to the Corvette as I ended up running a 2600 stalley and with the O/D the torque converter would have been on slip the whole time.  But I have fitted one to my manual Dodge Charger.  It's great.   With 354 diff gears it was great around town but revved too high on the express way, about 3300rpm at 110kmh.  Has dropped it down to about 2500rpm.  Much better.  They're not cheap.  You're looking at 3 grand for the unit plus cost to shorten ya tail shaft and labour to fit.  Don't event think of attempting to fit one yourself unless you know your way around the mechanics of your car.
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