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Old 04-21-2011, 05:47 AM
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Over drive

I have been driving this 454 vette with a th400 and factory 336 rear end, it not a hot rod but did dyno at 393 at the rear wheels, so I can get out of the way of some race rice burner at a light before he runs me over.

The problem that bothers me is at 70 I'm doing 3000 RPM and the 83 mile commute to work is about 60 miles at that speed and I just can't get a handle on doing that many RPMs.

I don't want to go to a gear vendors as if I keep this car, I may put an LS7 with a new overdrive auto in it, so the question.

Is there such a thing as a simple add on overdrive I can control with a switch when I need it?
I want simple and would say cheap but I know that is out of the question.

Any ideas?
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Old 04-21-2011, 05:58 AM
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cheap, is taller tires.
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Old 04-21-2011, 07:45 AM
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If you went to a manual, 3spd w. overdrive is do-able; or an M21 Overdrive conversion if you could find one. Highly unlikely though.
World Class T5
As far as the gearvendors; thats about the only piece readily available other than an old warner overdrive, which would need an adapter.

My boss (chief gear designer at A.G.) has a design on the board but it would take a year to get going and we'd need more than 1 buyer LOL

Cheap answers are lower numerical gear ratio, taller tires, or swap in a 200-4r with a rebuild from CK
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Old 04-21-2011, 01:01 PM
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Matt, if you only knew the pains I went through to get the wheels I wanted on this and to get the right size tire in a certian tire, it is out of question, knew you were kidding anyways.

Auto gear, the th400 is an "auto" if that makes a difference, if you have something for that, I'm game.

Thanks guys
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Old 04-21-2011, 01:20 PM
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In theory you could use a warner R11 but I cant find someone who has actually done it.
Our design would work, but its probably a year and a half away if it gets off the drawing board. The only other option is a GV unit.

I suppose other options would be a 700r, 200-4r, th350c
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Old 04-21-2011, 02:00 PM
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Thanks Auto grear, at this point did not want to fool with a trans change-out, over the last 4-5 years I have had every nut and bolt off this car in between doing three other vettes and I'm tired.

This is the first one out of almost 80 I have owned that, I did not restore but made it to please me and not ever doing modifications before, realized I knew nothing and am mentally shot.

This is also the first one I'm driving, so not sure I will like it or not but I will give it a year and if I like it will change engine and trans out to new drive train.

I have learned, I could never do what Cboy and Ireland have done.

Thanks for the help.
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Old 04-21-2011, 08:05 PM
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Quote:
Originally Posted by BarryK
The problem that bothers me is at 70 I'm doing 3000 RPM and the 83 mile commute to work is about 60 miles at that speed and I just can't get a handle on doing that many RPMs.
I don't have a suggestion other than a trans swap, but I can offer this:

my 79 C-10 with 454 and truck 4-spd along with 3:08 rear turns about 2700
at 75mph----and the truck likes running between 2700-3100. That is where it seems to run the best and is relatively economical (as far as a 454 goes).
14 mpg all day long at 73mph and 2700-2900 til the secondaries start to feather open.

On the other hand, the 59 El Camino with a 454 and a TKO 5-spd (.68 OD)
can only get me about 15 MPG at 70 turning 1950 in 5th.
3:36 and 26-1/2" tires. This particular engine (GMPP 454 HO) really wants to turn faster----seems to run smoother in 4th at 70 at around 25-2600. Might even be spinning faster---have not really paid much attention to it in 4th gear.
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Old 04-21-2011, 08:36 PM
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I am told that on the GM overdrives 200r4 or 700r4 overdrive can be controlled with a simple switch..Call Hughes performance or someone like that to check it out for sure..

Sam
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I have tried most all of it and now do what is known to work..
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Old 04-22-2011, 05:16 AM
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Quote:
Originally Posted by Bryan59EC
I don't have a suggestion other than a trans swap, but I can offer this:

my 79 C-10 with 454 and truck 4-spd along with 3:08 rear turns about 2700
at 75mph----and the truck likes running between 2700-3100. That is where it seems to run the best and is relatively economical (as far as a 454 goes).
14 mpg all day long at 73mph and 2700-2900 till the secondaries start to feather open.

On the other hand, the 59 El Camino with a 454 and a TKO 5-spd (.68 OD)
can only get me about 15 MPG at 70 turning 1950 in 5th.
3:36 and 26-1/2" tires. This particular engine (GMPP 454 HO) really wants to turn faster----seems to run smoother in 4th at 70 at around 25-2600. Might even be spinning faster---have not really paid much attention to it in 4th gear.

Funny, all the driving for testing and fine tuning was done close to home or with in 20 miles, just in case and this sucker went through gas like crazy.

First time drove it to work last week, I filled up in morning and filled up when I got home, I was dumbfounded to see I was averaging 16.2 miles per gallon.

I know these cars were made in the day to cruse at 3000 RPMs and it don't bother me to run it up to 5500 from a dead stop to show off but found my self gritting my teeth holding it at 3000 RPM for such a long jaunt.

The 57 T-bird was the same way, 3000 at 70 with a 3:10 rear but when we stopped showing the car I put in an AOD with a 3:56 rear and I'm at 2200 at 70 , give or take on the RPM, so I guess I just need to get over it as far as running 3000 RPM.

Thanks guys, did not think there was a simple solution.
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Old 04-22-2011, 05:40 AM
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I know in the days of overdrive we want to see cruising rpms like 1800-2200 but you are driving an old hotrod. 3000 rpms at cruise isn't horrible. Back in the day that would have been a pretty long legged rod, and about the tallest gear anyone would have wanted.
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Old 04-22-2011, 06:23 AM
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Quote:
Originally Posted by BarryK
Funny, all the driving for testing and fine tuning was done close to home or with in 20 miles, just in case and this sucker went through gas like crazy.

First time drove it to work last week, I filled up in morning and filled up when I got home, I was dumbfounded to see I was averaging 16.2 miles per gallon.

I know these cars were made in the day to cruse at 3000 RPMs and it don't bother me to run it up to 5500 from a dead stop to show off but found my self gritting my teeth holding it at 3000 RPM for such a long jaunt.

The 57 T-bird was the same way, 3000 at 70 with a 3:10 rear but when we stopped showing the car I put in an AOD with a 3:56 rear and I'm at 2200 at 70 , give or take on the RPM, so I guess I just need to get over it as far as running 3000 RPM.

Thanks guys, did not think there was a simple solution.
now i'm mad, i only get 16-17 mpg with my daily driver 1998 toyota 4runner

and barry, i was only kinda kidding about the tires
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Old 04-22-2011, 06:29 PM
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Different gas, different era but I used to have a 66 Olds 442 with a 4 speed and 4.33 gear. It would get 15 mpg at 65 if I was nice to it.
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Old 04-22-2011, 08:38 PM
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OP, I don't think you understand the Gear Vendors unit. It bolts onto the back of your current transmission and is operated either manually with a floor switch or automatically with GV electronics. This quote "Is there such a thing as a simple add on overdrive I can control with a switch when I need it?" makes no sense. Yes, there is such a thing, it's called a gear vendors overdrive.
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Old 04-23-2011, 04:45 PM
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Quote:
Originally Posted by cool rockin daddy
OP, I don't think you understand the Gear Vendors unit. It bolts onto the back of your current transmission and is operated either manually with a floor switch or automatically with GV electronics. This quote "Is there such a thing as a simple add on overdrive I can control with a switch when I need it?" makes no sense. Yes, there is such a thing, it's called a gear vendors overdrive.

I understand them well, never installed one but a friend had on on his F350 and it is a nice unit.
At this point I did not want to get involved in doing that major of a job, if I had the energy I would just swap out the trans, I figured someone would have a simple reducer unit by now that would be a simple install at the end of tranny but guess not.

Thanks everyone!
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Old 04-24-2011, 08:23 AM
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barry , call mike mcgee at trick shift. he can answer all your questions . 817-221-2400
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