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5/15/10 5:55pm - Original Message: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Today I picked up my '79 from the trans. shop with the 700R4 installed. I'm very happy with how it shifts, the lower 1st. gear and especially the lower RPMs at highway speeds.
The trans. came out of an '89 Chevy pickup truck. It was rebuilt with a mild shift kit. The tailshaft was such that my original crossmember was useable and left in place.
I've wanted to have this done for the last few years, so I'm psyched!!!
The correct speedo gear is not yet in but that'll get done in a few days.
The only (temporary) downside is my dual exhaust had to be tweaked in order to clear it's way around the new trans. It sounds like there is now an exhaust leak near the front and the right rear muffler is a bit out of place. I'm going to take it in to an exhaust guy I know this coming week and possibly will replace the whole true dual system as mine has been cut, welded and reconfigured in the past. 
I got alot of good info. here from previous threads on the 700R4 before I had this job done. Thanks for everyone's info!
Kevin 
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5/15/10 8:22pm - Reply: 'Got a 700R4'
Jeffm Gold Member
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. -1978 Pace Car L82 4spd (M21) 20k miles.

Joined: 2/15/2007
Posts: 962
Nice Kevin, Now get out there and drive her. Hope it works out really well for ya.

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5/15/10 9:08pm - Reply: 'Got a 700R4'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
Kev, nice job.......so that lower first gear......does it smoke em? Big smile
Evil Smileebo


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5/15/10 9:45pm - Reply: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Well, now yes it does...Approve. It's not like I'm going to burn the tires off it but they do break loose when I floor it from a dead stop. The shift kit gives it a little chirp at the 1-2 and 2-3 shift points, too. Thumbs Up

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5/16/10 7:44am - Reply: 'Got a 700R4'
2tonevette1981
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Hillsboro, TX - USA

Vette(s):
1981 beige/bronze

Joined: 3/2/2008
Posts: 147
Congrats!!! I have had my 700R4 for about a year now and do not regret the change one bit.

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5/17/10 11:56am - Reply: 'Got a 700R4'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
Fabulous Kevin. I'm just beginning the process myself. I looked long at the exhaust route ( new duals), but can't tell for certain what I'll have to do to accommodate things so I can make it the 30 mi. to the muffler shop. looks like a bridge I can't cross 'til I get there.

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Jimmy B.
Just can't wait to get on the road again.

 
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5/17/10 8:16pm - Reply: 'Got a 700R4'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
Well awwriiiight Kevin!!! Welcome to the club!!!

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5/17/10 9:53pm - Reply: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Hey Ace,

Depending on what's on your car now, you may just want to plan on re doing your exhaust so there's no issues when the 700 goes in. Maybe you could clamp something temporary together for the ride to the muffler shop. 

My true duals had already been cut and re welded for other reasons in the past. So when it was tweaked for the new trans., it just didn't line up too well. I'll be having some new pipes bent & installed in the near future to close the deal.
 
Paul,
Even with crappy exhaust and the wrong speedo gear I still enjoyed the ride to & from the shop today. The exhaust is annoying but it'll be done soon enough.
 
Kevin


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5/18/10 8:35am - Reply: 'Got a 700R4'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
A good muffler shop can work wonders as long as your pipes are in good shape

BTW, my speedo is off too!!!Embarrassed
lukesvette2010-05-18 06:36:34

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5/18/10 3:04pm - Reply: 'Got a 700R4'
2tonevette1981
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Hillsboro, TX - USA

Vette(s):
1981 beige/bronze

Joined: 3/2/2008
Posts: 147
When I changed mine over my muffler guy had to redo everything including putting the pipes through the crossmember so it would not rattle against it. It took him all day to measure everything and make the bends, but he did a great job


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5/18/10 3:50pm - Reply: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Yeah, even though the exhaust is more of an issue than I thought, I'm still glad I got the 700R4. "Ce la vie." 

I think anyone considering this swap should consider the possibility of new exhaust when they are adding up the costs.
 
Larry at Corvette Specialties is sending me the pipes and mufflers I need. I oughta be cruising at low RPM's soon enough. Thumbs Up


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5/19/10 9:21pm - Reply: 'Got a 700R4'
wetvet
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Lake Oswego, OR - USA

Vette(s):
1972 Steel Cities Gray T Top. Original Owner, Original Paint and Interior. The running gear has been rebuilt after 240,000 miles.

Joined: 10/17/2003
Posts: 540
What rear end gear are you running with the 700R4? I've always considered this trans change for my Vette. I have 3.08's with the Turbo 400. 3,000 rpm at 70 mph. What is the new rpm at 70 mph with the new 700R4?

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5/19/10 10:32pm - Reply: 'Got a 700R4'
2tonevette1981
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Hillsboro, TX - USA

Vette(s):
1981 beige/bronze

Joined: 3/2/2008
Posts: 147
With mine I kept the stock rear end and as far as the gearing in the tranny you would have to ask Joel. He rebuilt it. At 70 mph I run 1900 rpm

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5/20/10 7:58am - Reply: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Mine has (stock) 3.55's. The correct speedo gear hasn't been installed yet so I can't say what RPM's at what speeds.
In the meantime I have driven it at hwy. speeds and it's real obvious how much less the motor is working once it clicks into OD.  


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5/23/10 8:28am - Reply: 'Got a 700R4'
Autom8r
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Old Hickory, TN - USA

Vette(s):
1978 L-82 Silver Anniversary hotrod. /////////////

Joined: 5/26/2003
Posts: 599
Get a speedo gear for a C4 with the 3:43 diff. With your larger diameter tires it reads just right in your 3:55 diff.

Dave

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5/23/10 9:44pm - Reply: 'Got a 700R4'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Dave,

That's good info. to have.

I've been out of town for a couple of days and the speedo gear is on my "to do" list for this week. Thanks!

Kevin 


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5/24/10 8:15am - Reply: 'Got a 700R4'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
Kevin,
 
    Here's a useful site that provides the different gear combos based on rear end gearing. There's also a calculator to verify based on your tire size. 
 
 
Confirm which drive gear is in your tailshaft before ordering a driven gear. My driven gear is actually right but my drive gear is actually wayyyyyy off - should be 15 tooth and theres a 9 tooth gear in there - looks like its out of a TH350...doh
 
Have fun!!
 
Paul


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5/24/10 12:11pm - Reply: 'Got a 700R4'
Autom8r
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Old Hickory, TN - USA

Vette(s):
1978 L-82 Silver Anniversary hotrod. /////////////

Joined: 5/26/2003
Posts: 599
As I recall, I used the entire C4 gearset, driver and driven on mine.. Lots simpler to install with a dry tranny on the bench!

Dave

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Nashville, Tennessee, USA
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Hot rods, beer, boats, guns and babes. I love the USA!!!!

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5/24/10 12:12pm - Reply: 'Got a 700R4'
Autom8r
Former Member
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Old Hickory, TN - USA

Vette(s):
1978 L-82 Silver Anniversary hotrod. /////////////

Joined: 5/26/2003
Posts: 599
As I recall, I used the entire C4 gearset, driver and driven on mine.. Lots simpler to install with a dry tranny on the bench!

Dave

____________________________________
Nashville, Tennessee, USA
///////////////////////////////////////////////////////////////
Hot rods, beer, boats, guns and babes. I love the USA!!!!

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