C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

4 to 5 speed.

Thread Tools
 
Search this Thread
 
Old Apr 11, 2013 | 12:48 PM
  #21  
ThePabst's Avatar
ThePabst
Thread Starter
Instructor
10 Year Member
Liked
Loved
 
Joined: May 2011
Posts: 197
Likes: 4
From: Rochester New York
Default

Originally Posted by BB2B
I just installed the TKO 500 in mine with a 3.08 rear gear and it is great. I bought the Keisler kit which made the swap relatively simple, just bolt it all together. I'm running a small block 400 with 11 inch clutch. I used a comp extreme energy cam and have no issues with accelerating in 5th gear from low rpm. 1800 rpm at 70 mph is fantastic in this car.
Did YOU have to pull the motor or cut anything?
Reply
Old Apr 11, 2013 | 01:27 PM
  #22  
BB2B's Avatar
BB2B
Racer
25 Year Member
All Eyes On Me
 
Joined: Apr 1999
Posts: 422
Likes: 3
From: Oxford MI
Default

I pulled the motor to replace the stock 350. This made the clutch change and checking run out of the bell housing easy. Then I assembled everything and slid it back into the car,all by myself. this was not so difficult,just had to go slow. I did not cut the cross member.
Reply
Old Apr 11, 2013 | 01:30 PM
  #23  
ThePabst's Avatar
ThePabst
Thread Starter
Instructor
10 Year Member
Liked
Loved
 
Joined: May 2011
Posts: 197
Likes: 4
From: Rochester New York
Default

Originally Posted by BB2B
I pulled the motor to replace the stock 350. This made the clutch change and checking run out of the bell housing easy. Then I assembled everything and slid it back into the car,all by myself. this was not so difficult,just had to go slow. I did not cut the cross member.
How do you think it would have gone if you were to do it from underneath the car with out pulling the motor?
Reply
Old Apr 11, 2013 | 01:32 PM
  #24  
BB2B's Avatar
BB2B
Racer
25 Year Member
All Eyes On Me
 
Joined: Apr 1999
Posts: 422
Likes: 3
From: Oxford MI
Default

they say it can be done. I think my way was easier and I had better control of everything.
Reply
Old Apr 11, 2013 | 02:02 PM
  #25  
c3_dk's Avatar
c3_dk
Safety Car
15 Year Member
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jan 2008
Posts: 3,795
Likes: 435
From: Aarhus, Denmark
Default

Does anyone have the price from the RS transmissions?
Reply
Old Apr 11, 2013 | 02:06 PM
  #26  
ezobens's Avatar
ezobens
Drifting
10 Year Member
 
Joined: Aug 2005
Posts: 1,443
Likes: 65
From: Wauconda IL
Default

It can be done with the motor in the car but for the extra effort to pull the motor vs the convenience of having the motor out, why fight it?
If you're crunched for time and space, you can struggle from underneath-
I prefer to take the time and not kill myself in the process whenever possible.
Reply
Old Apr 11, 2013 | 02:23 PM
  #27  
Dustup7T2's Avatar
Dustup7T2
Terrorizing Orange Cones
Supporting Lifetime
10 Year Member
 
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Default

Originally Posted by ThePabst
I want to swap out the 4 speed on my (78 Silver Anniversary) daily driver in favor of one of the new 5 speed units out there.

...

Gearing? Clutch recommendations?

... And the more I hack on it, the more YOUR original one is worth. LOL!
Hi Pabst,
I selected, ordered, and installed a Keisler TKO600 5sp kit years ago and couldn't be more pleased.

Since I gutted most of the car (body on), I planned on a slightly modified 350 of around 425 hp to lead the way.

To Keisler's kit, I added a Sach's 11" pressure plate, disc, roller pilot bearing, and a Keisler bellhousing. Mounted a 30# Hays flywheel on the crank. It's a heavier flywheel than many run but the weight has not been detrimental to my results.

My TKO is the .64 OD and added the factory-looking shifter. I have the equivalent of a VB&P suspension with Steeroids r&p. I changed the rear gear ratio to 3.55.

The last calculation that I considered was making sure that my rear wheel height was at 27", which I've read is the factory tire height on these early C3 cars. I got close using 18" wheels and a 285/40 tire size. They measured at 26.9" tall and was close enough for government work.

Now, when I cruise the car down the interstate, I see this:



I'm enjoying an average of 20.5 to 21 mpg and allows me to range far away from my home base, without any real worries. Afterall, it is still just a Chevy with tried and true components.

Hope that helps and let us know what you decide. Good luck.
Reply
Old Apr 11, 2013 | 02:33 PM
  #28  
Garys 68's Avatar
Garys 68
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Sep 2004
Posts: 2,655
Likes: 19
Default

Swapping a T10 or Munice from under the car with a non-removable crossmember is a huge pain. The Richmond and TKOs are bigger and heavier. Do yourself a favor, pull the engine and/or make the crossmember removable.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Apr 11, 2013 | 02:53 PM
  #29  
ThePabst's Avatar
ThePabst
Thread Starter
Instructor
10 Year Member
Liked
Loved
 
Joined: May 2011
Posts: 197
Likes: 4
From: Rochester New York
Default

Looks like Dustup is on track, but a little richer than me

Pulling the engine is the only decent option...

Thanks for the tips guys!!!
Reply
Old Apr 11, 2013 | 04:42 PM
  #30  
Dustup7T2's Avatar
Dustup7T2
Terrorizing Orange Cones
Supporting Lifetime
10 Year Member
 
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Default

Not so much richer, really. I was lucky to save the resources and then pull the trigger when the plan unfolded. This little project took three years out of my young life to achieve.

It helped that I'd already paid my debt to society, as it were. No outside influences over the "usual and customary" debt that a majority of us carry.

Like the actor Rob Schneider likes to say in an Adam Sandler movie: "You can DO it!".
Reply
Old Apr 11, 2013 | 04:53 PM
  #31  
aaroncorvette's Avatar
aaroncorvette
Burning Brakes
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2009
Posts: 845
Likes: 54
From: Bangor, Northern Ireland
Default

As others have said you'll love it.

I can shift so much faster than my worn Muncie.

I have a TKO 600RR (0.82) with 3.55 gears and it's great

You'll want your first gear ratio, (1st gear x diff ) to come out around 10.

Mine's 2,87 x 3.55 = 10.2

The car feels (and is) so much faster, and cruising is so much nicer, sometimes I put in in 4th on the motorway to remind me what it used to feel like....then straight back into 5th
Reply
Old Apr 11, 2013 | 05:17 PM
  #32  
ThePabst's Avatar
ThePabst
Thread Starter
Instructor
10 Year Member
Liked
Loved
 
Joined: May 2011
Posts: 197
Likes: 4
From: Rochester New York
Default

Originally Posted by Dustup7T2
Not so much richer, really. I was lucky to save the resources and then pull the trigger when the plan unfolded. This little project took three years out of my young life to achieve.

It helped that I'd already paid my debt to society, as it were. No outside influences over the "usual and customary" debt that a majority of us carry.

Like the actor Rob Schneider likes to say in an Adam Sandler movie: "You can DO it!".
I can do it, no problem. The only reason I have gotten it as far as I have is that my father gave it to me as a gift, that puts me way ahead of the money game. I'm in my mid 50's and am BLESSED to still have both of my parents, but alas, my dad has gotten to a point in life where the Vette was just not on his plate anymore.

It had been stored for years after it fell into disrepair back in the days before there was a place like the internet to find opinions and assistance. Oh and great companies that re-make the parts and pieces to keep them on the road... They got cheap to keep again. He got it slightly used, but as a kid, I remember his repair costs 'back then' being off the hook. Prohibitive, for Johnny 6 pack with 4 mouths to feed.

Though not my first choice for a project car, (face it, the C3 requires a 'special taste' as the [78] does not exactly turn heads, silver anniversary or not.) and being that he could not get even close to a decent price for it, downsized everything and had no place to store it. So it eventually hit my garage floor and I have been slowly waking her up from her long sleep. I actually got it a point where I could drive it last summer; but it's just not a practical car for the times 'we' live in. It will be once I get a decent cam in it, modernize it, sell off all the nonsense and fluff and get that extra gear or two installed.

He is happy to see it back on the road and I'm glad he is here to see it. He loved that car.
Reply
Old Apr 11, 2013 | 07:44 PM
  #33  
Shark Racer's Avatar
Shark Racer
Race Director
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Default

Originally Posted by Dustup7T2
To Keisler's kit, I added a Sach's 11" pressure plate, disc, roller pilot bearing, and a Keisler bellhousing. Mounted a 30# Hays flywheel on the crank. It's a heavier flywheel than many run but the weight has not been detrimental to my results.
The stock flywheel should be around that weight.

Originally Posted by Dustup7T2
Now, when I cruise the car down the interstate, I see this:
What rear gear was that photo taken with? You'd have to have a 2.73-ish gear to tach like that at that speed.
Reply
Old Apr 11, 2013 | 08:37 PM
  #34  
DucatiDon's Avatar
DucatiDon
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 2,748
Likes: 90
From: Sacramento California
C2 of Year Finalist (performance mods) 2019
2018 C2 of Year Finalist
Default

I put a Keisler RS500 in my 63. It is WONDERFUL to drive. Now I need to do the same thing in my 78 auto.....

The 63 has 27" tires and 3.73s. 1700 RPM @ 60. Its got a solid lifter cam and pulls 5th gear nicely.

Oh....and YES pull the motor.

Last edited by DucatiDon; Apr 11, 2013 at 08:41 PM.
Reply
Old Apr 11, 2013 | 08:40 PM
  #35  
DucatiDon's Avatar
DucatiDon
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 2,748
Likes: 90
From: Sacramento California
C2 of Year Finalist (performance mods) 2019
2018 C2 of Year Finalist
Default

Originally Posted by c3_dk
Does anyone have the price from the RS transmissions?
Ask Keisler for a quote....but Im guessing around $3k-$4k
Reply
Old Apr 11, 2013 | 09:37 PM
  #36  
Dustup7T2's Avatar
Dustup7T2
Terrorizing Orange Cones
Supporting Lifetime
10 Year Member
 
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Default

Originally Posted by Shark Racer
The stock flywheel should be around that weight.


What rear gear was that photo taken with? You'd have to have a 2.73-ish gear to tach like that at that speed.
Hi Shark,
I remembered stock as 30# but some guys like 'em to be lighter.

3.55's. Took the pic on level ground while traveling on I-25. It does increase rpm slightly when I'm pulling a grade.

The tach is a replacement and I installed it without any further calibration. I expected the GM supplier (authorized GM replacement parts stickers on the box it was shipped in) to have handled that. ?
Reply
Old Apr 11, 2013 | 10:22 PM
  #37  
sweeet76's Avatar
sweeet76
Burning Brakes
 
Joined: May 2008
Posts: 948
Likes: 1
From: pensacola fl
Default

Has anyone paid a shop to do the swap and if so, what kind of labor cost would someone be looking at?
Reply

Get notified of new replies

To 4 to 5 speed.

Old Apr 12, 2013 | 12:23 AM
  #38  
Shark Racer's Avatar
Shark Racer
Race Director
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Default

Originally Posted by Dustup7T2
Hi Shark,
I remembered stock as 30# but some guys like 'em to be lighter.

3.55's. Took the pic on level ground while traveling on I-25. It does increase rpm slightly when I'm pulling a grade.

The tach is a replacement and I installed it without any further calibration. I expected the GM supplier (authorized GM replacement parts stickers on the box it was shipped in) to have handled that. ?
Electric conversion or stock mechanical?

Regardless, check this site out:
http://www.angelfire.com/fl/procrastination/rear.html

You should be around 2100 at that speed.
Reply
Old Apr 12, 2013 | 01:01 AM
  #39  
iokepakai's Avatar
iokepakai
Burning Brakes
15 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Default

Swapped in a Richmond 6spd,here's the write up.http://forums.corvetteforum.com/c3-t...am-change.html
Trans works great with the 3.08 rear gear.With 6 speeds you can always find the right gear and the rpm's don't drop off as much as a 5 speed.
Reply
Old Apr 12, 2013 | 05:10 PM
  #40  
Dustup7T2's Avatar
Dustup7T2
Terrorizing Orange Cones
Supporting Lifetime
10 Year Member
 
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Default

Originally Posted by Shark Racer
Electric conversion or stock mechanical?

...

You should be around 2100 at that speed.
The tach emulates OEM and is cable driven. Yup, good catch. Looks like I will ask a friend in possession of a portable GPS unit to schedule a ride along and offer a comparison to measure speed and go from there.

The Keisler speed analyzer for the TKO and plugging in my numbers is close to the same report as procrastination's analyzer.

http://keislerauto.com/speedanalyzer.html

I bet my configuration just fell into a YMMV dimension?

My previous response stands though; highway speed steady, rpm's down, mileage up, car owner happy.
Reply



All times are GMT -4. The time now is 10:45 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE