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Overdrive Trans in a C3?

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Old Jul 30, 2005 | 12:03 PM
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Default Overdrive Trans in a C3?

Is there a overdrive trany that will fit in my 81 350 auto. Would like to be able to cruise at 80 mph without earplugs.
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Old Jul 30, 2005 | 12:47 PM
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-200r4
-700r4
-t5
-t56
-tko
-zf...
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Old Jul 30, 2005 | 12:59 PM
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i have a 700r4,and there are lot of conversions here on the forum,200's 5 speeds 6 speeds etc...
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Old Jul 30, 2005 | 03:05 PM
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200-4R in mine now and it is great. 70mph at 2200rpm's with the 3.55 rear gear, about 17mpg on the highway. trans install
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Old Jul 30, 2005 | 03:15 PM
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Gearvendors overdrive can be added on...I think around $1300. Why do people have automatics in a sports car is WAYY beyond me!
Automatics are just money-makers for the rebuilders! Get you a 4 speed for fun and add the OD for economy. In the long run, that'll be less than the auto/od route...IMHO..good luck, jim
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Old Jul 30, 2005 | 03:23 PM
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Originally Posted by jimbow
Gearvendors overdrive can be added on...I think around $1300. Why do people have automatics in a sports car is WAYY beyond me!
Automatics are just money-makers for the rebuilders! Get you a 4 speed for fun and add the OD for economy. In the long run, that'll be less than the auto/od route...IMHO..good luck, jim
Gearvendors is a heavy hard to install unit, and only a 20% engine speed reduction, and so that makes it not worth the money.....
what's needed is a MINIMUM of 30% reduction....shuld be 50% like the modern 6 speeds....

I tend to agree about the automatics, certainly MINE, the 700, which IF I had the knowledge I would have done a 200 4r conversion back in '97, .....or would have retained my stick shift, but no trannies available for less than 4 grand back then...NONE....so I went with the flow, figgering if the C4 used the 700, it's not THAT bad....RONG....

GENE
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Old Jul 30, 2005 | 03:48 PM
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Redwing were did you get the new runners under the sill plate, mine to are rusted out, and did you have to cut any fiberglass to get that square channel up into the squarrel cage. Rocker channel is what I was trying to think of. I also saw on your web site that your number1# moount surface is square. Did you just weld a peice over the original mount, did it change the way the boby sits on the frame? One more thing is the 200 computer controled i'm trying to get away from the ECM.

Last edited by smooth-rider; Jul 30, 2005 at 03:55 PM. Reason: added words
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Old Jul 30, 2005 | 07:30 PM
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Default overdrive tran.

Originally Posted by jimbow
Gearvendors overdrive can be added on...I think around $1300. Why do people have automatics in a sports car is WAYY beyond me!
Automatics are just money-makers for the rebuilders! Get you a 4 speed for fun and add the OD for economy. In the long run, that'll be less than the auto/od route...IMHO..good luck, jim

Well,don't be too hard on those of us that use auto. trannies.I'm a disabled VET,and there is no other way for me to drive an automobile.
That shouldn't be WAYY beyond you to understand.
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Old Jul 30, 2005 | 08:12 PM
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200r4 and very happy with the mod.

Kona
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Old Jul 30, 2005 | 08:39 PM
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Ok starting to lean towards the 200r
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Old Jul 30, 2005 | 09:25 PM
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Originally Posted by jimbow
Gearvendors overdrive can be added on...I think around $1300. Why do people have automatics in a sports car is WAYY beyond me!
Automatics are just money-makers for the rebuilders! Get you a 4 speed for fun and add the OD for economy. In the long run, that'll be less than the auto/od route...IMHO..good luck, jim
The only thing that I like automatics for is Bracket Racing.. Stick shift is a huge disadvantage when bracket racing..
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Old Jul 30, 2005 | 09:25 PM
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Originally Posted by smooth-rider
Ok starting to lean towards the 200r
Good Choice!! That's what I'm using.. Mine is built to 800 HP
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Old Jul 30, 2005 | 10:18 PM
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Grandsport, who built your 200r? I'm being lazy by not searching for your earlier threads though, sorry!
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Old Jul 30, 2005 | 11:13 PM
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Originally Posted by surfshark
Grandsport, who built your 200r? I'm being lazy by not searching for your earlier threads though, sorry!
Mine was built by:

http://www.cpttransmission.com

(This is Art Carr's business)
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Old Jul 30, 2005 | 11:18 PM
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Thanks GrandSport, I think Chevy High Performance magazine may have put one of CPT's transmissions in a Chevelle as a feature. I'll check out the site you included.
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Old Jul 30, 2005 | 11:31 PM
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Originally Posted by surfshark
Thanks GrandSport, I think Chevy High Performance magazine may have put one of CPT's transmissions in a Chevelle as a feature. I'll check out the site you included.
My engine is putting out around 600 HP and I aleady have 38 drag strip passes on it without any issues.. It's holding up very good so far!!
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Old Jul 30, 2005 | 11:41 PM
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Did you set the trans up yourself with regard to the TV cable and pressure? I know Bowtie Overdrives requires you to purchase an install kit to measure this as per the warranty. How did you set up yours?
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Old Jul 30, 2005 | 11:46 PM
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Originally Posted by surfshark
Did you set the trans up yourself with regard to the TV cable and pressure? I know Bowtie Overdrives requires you to purchase an install kit to measure this as per the warranty. How did you set up yours?
I just adjusted the TV cable to be fully pulled out at WOT... I'm mostly concerned about getting the maximum line pressure at WOT.. I also drove a total of about 150 miles on the street like that and it worked great...
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Old Jul 30, 2005 | 11:49 PM
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Thanks for the info.
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Old Jul 31, 2005 | 12:32 AM
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Originally Posted by kona
200r4 and very happy with the mod.

Kona
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