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Transmission selection:

 
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Thu Nov 02, 2006 9:18 am    Post subject: Transmission selection: Reply with quote

One of the projects I'm doing this winter is a 1979 Corvette. We'll be going through the suspension and complete powertrain. I was thinking of going with a 355 horse crate engine, 5 or 6 speed and something around a 3.70 gear. I tried to talk them into a 700R4 but they want to keep the stick. It's going to be a street car. Any suggestions on a transmission?
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GrandSportC3
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Joined: 11 Jul 2003
Posts: 1231
Location: Lakeland, FL
32443.62 points


1968 Chevrolet Corvette

PostPosted: Thu Nov 02, 2006 9:58 am    Post subject: Re: Transmission selection: Reply with quote

jeep_406 wrote:
One of the projects I'm doing this winter is a 1979 Corvette. We'll be going through the suspension and complete powertrain. I was thinking of going with a 355 horse crate engine, 5 or 6 speed and something around a 3.70 gear. I tried to talk them into a 700R4 but they want to keep the stick. It's going to be a street car. Any suggestions on a transmission?


The absolutely best choice for a stick shift car with 3.70 gears is the Tremec TKO.. I had a 5-speed TKO in my Vette before I installed the 200R4.. It was a great tranny.. The 3.27 first gear is great for burnouts and good 60' times.. I got 1.50's 60' times with only 465 HP... The .68 overdrive is also great.. 2200 RPM at 70 mph or so...
The install of the GM TKO is fairly simple but a few mods are necessary... The cost for material runs about $2200 - $2300..

The tranny should be available for about $1900 or cheaper.
A take-apart yoke (I got mine from Mark Williams) is needed. ($225)
You'll also need a transmission mount bracket as the mounting location of the TKO is different.. Any brackets designed for TH700R4's will work as the 700R4 and Tremec TKO mounting locations are identical. I got my bracket from Bowtie Overdrives but I believe that they don't sell those anymore.. I paid $80 for the bracket. The driveshaft will have to be shortened which should run about $80 or so.. A conversion u-joint is needed for the transmission yoke to driveshaft as Corvette driveshaft u-joints are either 1310 or 1330 series (depends on year and tranny) and the yoke is 1350 series and therefore a u-joint which is 1350 on one side and 1310 or 1330 on the other side. Those exist but are hard to find.. I personally upgraded my driveshaft to 1350 series and changed out the differential yoke to 1350 too.
For the install, some of the web on the bottom of the TKO will have to be ground down (about 10 minutes of work) and the shifter location will have to be spaced over to come up in the right location.. Another option is to modify the console as the shifter will come up in the center and not on the left side. The tunnell will have to be cut for the new shifter location. All in all, it's a pretty simple install with a little extra work. Nothing difficult..
The total cost shouldn't exceed $2500 or so... (unless you upgrade the clutch too)
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Thu Nov 02, 2006 4:55 pm    Post subject: Reply with quote

What suggestion do you have for a clutch? I don't think the car will ever see more than a real street tire.
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disturbthepeace1
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Posts: 303
Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Thu Nov 02, 2006 10:56 pm    Post subject: Reply with quote

If anyone needs a conversion yoke I know a parts store that stocks them regularly...
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GrandSportC3
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Joined: 11 Jul 2003
Posts: 1231
Location: Lakeland, FL
32443.62 points


1968 Chevrolet Corvette

PostPosted: Fri Nov 03, 2006 12:15 pm    Post subject: Reply with quote

jeep_406 wrote:
What suggestion do you have for a clutch? I don't think the car will ever see more than a real street tire.

I used a HAYS clutch setup. Borg&Beck pressure plate and a competition HAYS clutch.. I launched very hard and power-shifted without a problem with that clutch..

Well, there was a problem but it wasn't with the clutch.. I broke a few rear ends with power-shifting and stopped power-shifting 1 - 2 after a while as it got too expensive on parts..
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GrandSportC3
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Joined: 11 Jul 2003
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Location: Lakeland, FL
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1968 Chevrolet Corvette

PostPosted: Fri Nov 03, 2006 12:18 pm    Post subject: Reply with quote

disturbthepeace1 wrote:
If anyone needs a conversion yoke I know a parts store that stocks them regularly...


I don't think that a conversion yoke is needed, just a conversion u-joint.. However, if there's a 1330 series take apart yoke with the correct spline count (I believe 31) it would work too but I'm not sure if anyone makes that yoke for 1330 series (or 1310 series if needed)

What is needed is a conversion U-JOINT...
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Fri Nov 03, 2006 12:33 pm    Post subject: Reply with quote

Thanks for the info. Good luck in your dragracing through the winter months. Us Northeast guys are jealous. Our season is on hold until April.
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GrandSportC3
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Joined: 11 Jul 2003
Posts: 1231
Location: Lakeland, FL
32443.62 points


1968 Chevrolet Corvette

PostPosted: Fri Nov 03, 2006 12:43 pm    Post subject: Reply with quote

jeep_406 wrote:
Thanks for the info. Good luck in your dragracing through the winter months. Us Northeast guys are jealous. Our season is on hold until April.


I wish that I had the cold temperatures for racing as the car would run a lot faster with the temps from up north...
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disturbthepeace1
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Joined: 14 Jun 2003
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Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Fri Nov 03, 2006 10:00 pm    Post subject: Reply with quote

I ment a U-joint.. I guess i need to read over my post before i post them..........
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GrandSportC3
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Joined: 11 Jul 2003
Posts: 1231
Location: Lakeland, FL
32443.62 points


1968 Chevrolet Corvette

PostPosted: Fri Nov 03, 2006 10:38 pm    Post subject: Reply with quote

disturbthepeace1 wrote:
I ment a U-joint.. I guess i need to read over my post before i post them..........

I thought that it could've been a typo as I'm not aware if there are conversion yokes Laughing
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